JP2019091028A - Fixing device and image forming apparatus - Google Patents

Fixing device and image forming apparatus Download PDF

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JP2019091028A
JP2019091028A JP2018206340A JP2018206340A JP2019091028A JP 2019091028 A JP2019091028 A JP 2019091028A JP 2018206340 A JP2018206340 A JP 2018206340A JP 2018206340 A JP2018206340 A JP 2018206340A JP 2019091028 A JP2019091028 A JP 2019091028A
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thermal conductivity
fixing device
belt member
conductivity portion
recording medium
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JP7218542B2 (en
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貴亮 佐藤
Takaaki Sato
貴亮 佐藤
聖 小柳
Kiyoshi Koyanagi
聖 小柳
井上 徹
Toru Inoue
井上  徹
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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Abstract

To provide a fixing device and an image forming apparatus that can reduce the rise time of the surface temperature of a heating unit, compared with a configuration in which a low heat conduction member is partially arranged.SOLUTION: A fixing device comprises: a circulating belt member 611; a pressing unit that is in contact with the belt member and applies pressure to a recording medium moving between the belt member and pressing unit; a heat source 612 having a substrate 612A, and a resistance heating element that is formed on a surface of the substrate to extend in the longitudinal direction of the substrate and heats an inner surface of the belt member; a low heat conduction part 613 that is arranged on a surface of the heat source 612 on the opposite side of a surface close to the belt member; and a high heat conduction part 614 that is arranged on a surface of the low heat conduction part on the opposite side of a surface close to the heat source. The heat source is arranged in contact with the low heat conduction part and not in contact with the high heat conduction part.SELECTED DRAWING: Figure 4

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 a fixing device and an image forming apparatus.

ヒータと、ヒータを支持すると共に放熱を防ぐ断熱支持部材と、ヒータに摺接可能に設けられたフィルムと、を有した加熱部材と、加熱部材側に加圧可能に配置された加圧部材と、を備え、フィルムと加圧部材との間にシートを搬送させて、シートを加圧しながら加熱する加熱装置おいて、ヒータと断熱支持部材との間に高熱伝導性部材を介在させる加熱装置が知られている(特許文献1)。   A heating member having a heater, a heat insulating supporting member for supporting the heater and preventing heat radiation, a film provided slidably in contact with the heater, and a pressing member disposed on the heating member side so as to be capable of pressurizing A heating device for conveying the sheet between the film and the pressing member and heating while pressing the sheet, wherein the high thermal conductive member is interposed between the heater and the heat insulating support member. It is known (patent document 1).

走行駆動される定着フィルムと、それを挟んで圧接する加熱体と加圧部材を有し、定着フィルムを挟んで加熱体と加圧部材との加圧で形成される定着ニップ部の定着フィルムと加圧部材との間に未定着顕画像を担持した記録材を導入して走行する定着フィルムと共に定着ニップ部を移動通過させることで、加熱体から定着フィルムを介して記録材に熱エネルギーを与えて顕画像を加熱定着する定着装置であり、加熱体の定着フィルムとの当接面とは反対側に、100〔kcal/mhr℃〕以上の熱伝導率を有する高熱伝導部材が設けられている定着装置も知られている(特許文献2)。   A fixing film which is driven to travel, and a heating member and a pressing member which are in pressure contact with each other across the fixing film; and the fixing film of the fixing nip portion formed by the pressure of the heating member and the pressing member with the fixing film interposed therebetween; By supplying a recording material carrying an unfixed toner image to the pressing member and moving it through the fixing nip with the traveling fixing film, heat energy is given to the recording material from the heating body through the fixing film. Is a fixing device that heats and fixes a visible image, and a high thermal conductivity member having a thermal conductivity of 100 kcal / mhr ° C. or higher is provided on the opposite side of the heating body to the contact surface with the fixing film. A fixing device is also known (Patent Document 2).

特開平11−84919号公報Japanese Patent Application Laid-Open No. 11-84919 特開平5−289555号公報Unexamined-Japanese-Patent No. 5-289555

本発明は、一部に低熱伝導部材が配置されている構成に比べて、発熱部表面温度の立ち上がり時間を短縮することができる定着装置及び画像形成装置を提供する。   The present invention provides a fixing device and an image forming apparatus capable of shortening the rise time of the surface temperature of the heat generating portion as compared with the configuration in which the low heat conductive member is partially disposed.

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手段と、
基材と、前記基材の表面に前記基材の長手方向に延びるように形成された発熱部からなり前記ベルト部材の内面を加熱する加熱手段と、
前記加熱手段の、前記ベルト部材に近い面と反対側の面に配置された低熱伝導部と、
前記低熱伝導部の前記加熱手段に近い面とは反対側の面に配置された高熱伝導部と、を備え、
前記加熱手段が前記低熱伝導部と接触し、かつ前記高熱伝導部と接触しないように配置されている、
ことを特徴とする。
In order to solve the above-mentioned subject, the fixing device according to claim 1,
A circulating belt member,
Pressing means for pressing the recording medium contacting the belt member and moving between the belt member and the belt member;
A substrate, and a heating unit that heats the inner surface of the belt member, the heating unit being formed on the surface of the substrate so as to extend in the longitudinal direction of the substrate;
A low heat conducting portion disposed on the side opposite to the side near the belt member of the heating means;
And a high thermal conductivity portion disposed on a surface opposite to the surface close to the heating means of the low thermal conductivity portion;
The heating means is disposed so as to be in contact with the low thermal conductivity portion and not to be in contact with the high thermal conductivity portion.
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、
前記低熱伝導部の前記記録媒体の搬送方向における幅は、前記加熱手段の前記記録媒体の搬送方向における幅よりも広い、
ことを特徴とする。
According to a second aspect of the present invention, in the fixing device according to the first aspect,
The width of the low thermal conductivity portion in the conveyance direction of the recording medium is wider than the width of the heating unit in the conveyance direction of the recording medium.
It is characterized by

請求項3記載の発明は、請求項1又は2に記載の定着装置において、
前記低熱伝導部は、長手方向において前記加熱手段の前記発熱部よりも長い、
ことを特徴とする。
The invention according to claim 3 is the fixing device according to claim 1 or 2
The low heat conducting portion is longer in the longitudinal direction than the heat generating portion of the heating means.
It is characterized by

請求項4記載の発明は、請求項3に記載の定着装置において、
前記低熱伝導部は、長手方向において前記加熱手段の前記基材よりも短い、
ことを特徴とする。
According to a fourth aspect of the present invention, in the fixing device according to the third aspect,
The low thermal conductivity portion is shorter than the base of the heating means in the longitudinal direction.
It is characterized by

請求項5記載の発明は、請求項1ないし4のいずれか1項に記載の定着装置において、
前記高熱伝導部の前記記録媒体の搬送方向における幅は、前記加熱手段の前記記録媒体の搬送方向における幅よりも広い、
ことを特徴とする。
The invention according to claim 5 is the fixing device according to any one of claims 1 to 4 in which
The width of the high thermal conductivity portion in the conveyance direction of the recording medium is wider than the width of the heating unit in the conveyance direction of the recording medium.
It is characterized by

請求項6記載の発明は、請求項1ないし5のいずれか1項に記載の定着装置において、
前記高熱伝導部の厚さは、前記高熱伝導部の前記記録媒体の搬送方向において前記発熱部の両外側が厚い、
ことを特徴とする。
The invention according to claim 6 is the fixing device according to any one of claims 1 to 5,
The thickness of the high thermal conductivity portion is such that both outer sides of the heat generating portion are thick in the conveyance direction of the recording medium of the high thermal conductivity portion.
It is characterized by

請求項7記載の発明は、請求項6に記載の定着装置において、
前記低熱伝導部の厚さは、前記低熱伝導部の前記記録媒体の搬送方向において中央部が厚い、
ことを特徴とする。
The invention according to claim 7 is the fixing device according to claim 6.
The thickness of the low thermal conductivity portion is thicker at a central portion in the conveyance direction of the recording medium of the low thermal conductivity portion.
It is characterized by

請求項8記載の発明は、請求項1、2、3、5ないし6のいずれか1項に記載の定着装置において、
前記低熱伝導部は、前記加熱手段の全面に接触している、
ことを特徴とする。
The invention according to claim 8 is the fixing device according to any one of claims 1, 2, 3, 5 to 6, wherein
The low heat conducting portion is in contact with the entire surface of the heating means.
It is characterized by

請求項9記載の発明は、請求項1に記載の定着装置において、
前記低熱伝導部の前記記録媒体の搬送方向における幅は、前記高熱伝導部の前記記録媒体の搬送方向における幅よりも広い、
ことを特徴とする。
The invention according to claim 9 is the fixing device according to claim 1.
The width of the low thermal conductivity portion in the transport direction of the recording medium is wider than the width of the high thermal conductivity portion in the transport direction of the recording medium,
It is characterized by

前記課題を解決するために、請求項10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手段と、
基材と、前記基材の表面に前記基材の長手方向に延びるように形成された発熱部からなり前記ベルト部材の内面を加熱する加熱手段と、
前記加熱手段の、前記ベルト部材に近い面と反対側の面に配置された低熱伝導部と、
前記低熱伝導部の前記加熱手段に近い面とは反対側の面に配置された高熱伝導部と、を備え、
前記高熱伝導部のうち前記低熱伝導部と接触する面には凹部が長手方向全域には形成されていない、
ことを特徴とする。
In order to solve the above-mentioned subject, the fixing device according to claim 10,
A circulating belt member,
Pressing means for pressing the recording medium contacting the belt member and moving between the belt member and the belt member;
A substrate, and a heating unit that heats the inner surface of the belt member, the heating unit being formed on the surface of the substrate so as to extend in the longitudinal direction of the substrate;
A low heat conducting portion disposed on the side opposite to the side near the belt member of the heating means;
And a high thermal conductivity portion disposed on a surface opposite to the surface close to the heating means of the low thermal conductivity portion;
In the surface of the high thermal conductivity portion in contact with the low thermal conductivity portion, a recess is not formed over the entire area in the longitudinal direction,
It is characterized by

前記課題を解決するために、請求項11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手段と、
基材と、前記基材の表面に前記基材の長手方向に延びるように形成された発熱部からなり前記ベルト部材の内面を加熱する加熱手段と、
前記加熱手段の、前記ベルト部材に近い面と反対側の面に配置された低熱伝導部と、
前記低熱伝導部の前記加熱手段に近い面とは反対側の面に配置された高熱伝導部と、を備え、
前記加熱手段のうち前記ベルト部材に近い面と反対側の面が前記低熱伝導部と接触し、かつ前記高熱伝導部と接触しないように配置されている、
ことを特徴とする。
In order to solve the above-mentioned subject, the fixing device according to claim 11,
A circulating belt member,
Pressing means for pressing the recording medium contacting the belt member and moving between the belt member and the belt member;
A substrate, and a heating unit that heats the inner surface of the belt member, the heating unit being formed on the surface of the substrate so as to extend in the longitudinal direction of the substrate;
A low heat conducting portion disposed on the side opposite to the side near the belt member of the heating means;
And a high thermal conductivity portion disposed on a surface opposite to the surface close to the heating means of the low thermal conductivity portion;
The surface of the heating means opposite to the surface close to the belt member is disposed so as to be in contact with the low heat conduction portion and not to be in contact with the high heat conduction portion.
It is characterized by

請求項12記載の発明は、請求項1ないし11のいずれか1項に記載の定着装置において、
前記低熱伝導部は、耐熱合成樹脂又は空気層である、
ことを特徴とする。
The invention according to claim 12 is the fixing device according to any one of claims 1 to 11:
The low heat conducting part is a heat resistant synthetic resin or an air layer,
It is characterized by

前記課題を解決するために、請求項13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12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-mentioned subject, the image forming apparatus according to claim 13 is
An image forming unit for forming an image on a recording medium;
The fixing device according to any one of claims 1 to 12, which fixes the image on the recording medium on which the image is formed by the image forming unit.
It is characterized by

請求項1、13に記載の発明によれば、一部に低熱伝導部材が配置されている構成に比べて、発熱部表面温度の立ち上がり時間を短縮することができる。   According to the inventions of claims 1 and 13, the rise time of the heat generating portion surface temperature can be shortened as compared with the configuration in which the low heat conduction member is disposed in part.

請求項2に記載の発明によれば、加熱手段の幅方向において加熱手段と高熱伝導部とが接触しないようにすることができる。   According to the second aspect of the present invention, the heating means and the high thermal conductivity portion can be prevented from coming in contact with each other in the width direction of the heating means.

請求項3に記載の発明によれば、加熱手段の長手方向においても加熱手段のうち発熱部と対応した部分と高熱伝導部とが接触しないようにすることができる。   According to the third aspect of the present invention, even in the longitudinal direction of the heating means, it is possible to prevent the portion corresponding to the heat generating portion of the heating means from coming into contact with the high thermal conductivity portion.

請求項4に記載の発明によれば、加熱手段の長手方向において断熱が不要な領域の断熱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 the heat insulation of the area where the heat insulation is unnecessary in the longitudinal direction of the heating means.

請求項5に記載の発明によれば、非通紙領域の温度上昇を抑制することができる。   According to the fifth aspect of the present invention, it is possible to suppress the temperature rise in the non-sheet passing area.

請求項6に記載の発明によれば、非通紙領域の温度上昇を抑制することができる。   According to the sixth aspect of the present invention, it is possible to suppress the temperature rise in the non-sheet passing area.

請求項7に記載の発明によれば、非通紙領域の温度上昇を抑制することができる。   According to the seventh aspect of the invention, it is possible to suppress the temperature rise in the non-sheet passing area.

請求項6に記載の発明によれば、高熱伝導部の厚さが変化する構成に比べて、発熱部表面の発熱分布を均一化することができる。   According to the sixth aspect of the present invention, the heat generation distribution on the surface of the heat generating portion can be made uniform, as compared with a configuration in which the thickness of the high thermal conductivity portion changes.

請求項7に記載の発明によれば、非通紙領域の温度上昇を抑制することができる。   According to the seventh aspect of the invention, it is possible to suppress the temperature rise in the non-sheet passing area.

請求項8に記載の発明によれば、加圧手段と加熱手段との接触領域における圧力分布を均一化することができる。   According to the eighth aspect of the present invention, the pressure distribution in the contact area between the pressurizing means and the heating means can be made uniform.

請求項9に記載の発明によれば、高熱伝導部が、より確実に加熱手段と接触しない構成とすることができる。   According to the ninth aspect of the present invention, the high thermal conductivity portion can be configured not to contact the heating means more reliably.

請求項10に記載の発明によれば、高熱伝導部のうち低熱伝導部と接触する面に凹部が長手方向全域に形成されている構成と比べて、高熱伝導部の低熱伝導部と接触する面積が増大して発熱部表面の発熱分布をより均一化することができる。   According to the invention as set forth in claim 10, compared with the configuration in which the recess is formed in the entire area in the longitudinal direction on the surface of the high thermal conductivity portion in contact with the low thermal conductivity portion, the area contacting the low thermal conductivity portion of the high thermal conductivity portion The heat generation distribution on the surface of the heat generating portion can be made more uniform.

請求項11に記載の発明によれば、加熱手段のうちベルト部材に近い面と反対側の面が高熱伝導部と接触する構成と比べて、発熱部表面温度の立ち上がり時間を短縮することができる。することができる。   According to the invention as set forth in claim 11, the rise time of the surface temperature of the heat generating portion can be shortened as compared with the configuration in which the surface opposite to the surface close to the belt member in the heating means is in contact with the high thermal conductivity portion. . can do.

請求項12に記載の発明によれば、発熱部表面温度の立ち上がり時間を短縮することができる。   According to the twelfth aspect of the present invention, the rise time of the heat generating portion surface temperature can be shortened.

画像形成装置の内部構成を示す断面模式図である。FIG. 2 is a schematic cross-sectional view showing an internal configuration of the image forming apparatus. 定着装置の全体構成を示す断面模式図である。FIG. 1 is a schematic cross-sectional view showing the entire configuration of a fixing device. 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 heating source. 加熱モジュールの構成の一態様を説明する断面模式図である。It is a cross-sectional schematic diagram explaining the one aspect | mode of a structure of a heating module. 加熱モジュールの長手方向の構成を説明する縦断面模式図である。It is a longitudinal cross-section schematic diagram explaining the structure of the longitudinal direction of a heating module. 加熱モジュールの構成の他の態様を説明する断面模式図である。It is a cross-sectional schematic diagram explaining the other aspect of a structure of a heating module. 定熱伝導部と高熱伝導部の接触を説明する斜視図である。It is a perspective view explaining the contact of a constant heat conduction part and a high heat conduction part. (a)は定着装置における立ち上がり時の熱移動を説明する説明図、(b)は印刷時の熱移動を説明する説明図である。(A) is explanatory drawing explaining the heat transfer at the time of standup in a fixing device, (b) is explanatory drawing explaining the heat transfer at the time of printing. 変形例1に係る低熱伝導部を有する加熱モジュールの構成を示す断面模式図である。It is a cross-sectional schematic diagram which shows the structure of the heating module which has the low thermal-conduction part which concerns on the modification 1. FIG. 変形例2に係る高熱伝導部を有する加熱モジュールの構成を示す断面模式図である。It is a cross-sectional schematic diagram which shows the structure of the heating module which has the high heat conduction part which concerns on the modification 2. As shown in FIG. 変形例3に係る低熱伝導部を有する加熱モジュールの構成を示す断面模式図である。It is a cross-sectional schematic diagram which shows the structure of the heating module which has the low thermal-conduction part which concerns on the modification 3. FIG. 変形例4に係る低熱伝導部を有する加熱モジュールの構成を示す断面模式図である。It is a cross-sectional schematic diagram which shows the structure of the heating module which has the low thermal-conduction part which concerns on the modification 4. FIG. 定着装置の立ち上がり時間と低熱伝導部の厚さとの関係を示す図である。FIG. 6 is a view showing the relationship between the rise time of the fixing device and the thickness of the low heat conducting portion. 実施例2に係る定着装置の加熱モジュールの長手方向の縦断面模式図である。FIG. 7 is a schematic longitudinal sectional view of the heating module of the fixing device according to Embodiment 2; 実施例2に係る定着装置における非通紙部の定着ベルトの温度と高熱伝導部の厚さとの関係を示す図である。FIG. 7 is a view showing the relationship between the temperature of the fixing belt at the non-sheet passing portion and the thickness of the high heat conduction portion in the fixing device according to Embodiment 2. 実施例3に係る定着装置の加熱モジュールの断面模式図である。FIG. 10 is a schematic cross-sectional view of a heating module of the fixing device according to Embodiment 3. 実施例3に係る定着装置の加熱モジュールの長手方向の縦断面模式図である。FIG. 13 is a schematic longitudinal sectional view of the heating module of the fixing device according to Embodiment 3; 比較例に係る定着装置の加熱モジュールの断面模式図である。It is a cross-sectional schematic diagram of the heating module of the fixing device which concerns on a comparative example. 比較例に係る定着装置の加熱モジュールの長手方向の縦断面模式図である。It is a longitudinal cross-section schematic diagram of the longitudinal direction of the heating module of the fixing device concerning a comparative example.

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, the present invention will be described in more detail by way of embodiments and specific examples with reference to the drawings, but the present invention is not limited to these embodiments and specific examples.
Moreover, in the description using the following drawings, it should be noted that the drawings are schematic, and that the ratio of each dimension is different from the actual one, and is necessary for the explanation to facilitate understanding. The illustration other than the members is appropriately omitted.
In order to facilitate understanding of the following description, in the drawings, the left-right direction is taken 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 sectional view showing an internal configuration of an image forming apparatus 1 according to the present embodiment.
The overall configuration and operation of the image forming apparatus 1 will be described below 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 is configured to include a control device 10, a sheet 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, a discharge tray 1a is formed in which the sheet on which the image is recorded is discharged and stored.

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、露光ヘッド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 apparatus control unit 11 that controls the operation of the image forming apparatus 1, a controller unit 12 that prepares image data according to a print processing request, and an exposure control unit 13 that controls lighting of the exposure head LH. 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、駆動信号を露光ヘッドLHに出力する。本実施形態の露光ヘッド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 apparatus (for example, a personal computer or the like) into image information for forming a latent image and outputs a drive signal to the exposure head LH at a preset timing. . The exposure head LH of the present embodiment is configured of 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。   At the bottom of the image forming apparatus 1, a sheet feeding device 20 is provided. The sheet feeding device 20 includes a sheet stacking plate 21, and a plurality of sheets P as recording media are stacked on the upper surface of the sheet stacking plate 21. The sheet P stacked on the sheet stacking plate 21 and whose position in the width direction is determined by the restriction plate (not shown) is drawn forward one by one from the upper side by the sheet extracting portion 22 (X direction). The sheet is conveyed to the nip 23

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、露光ヘッド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 photosensitive unit 30 is provided in parallel with each other above the sheet feeding device 20 (in the Z direction), and includes a photosensitive drum 31 as an image holding member that is rotationally driven. The charging roller 32, the exposure head LH, the developing device 40, the primary transfer roller 52, and the cleaning blade 34 are disposed along the rotational direction of the photosensitive drum 31. A cleaning roller 33 for cleaning the surface of the charging roller 32 is disposed opposite to and in contact with 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 developer composed of toner and carrier is accommodated. In the developing housing 41, a developing roller 42 as a developer holding member disposed opposite to the photosensitive drum 31, and the developer is stirred and conveyed to the developing roller 42 side obliquely downward on the back side of the developing roller 42. A pair of augers 44, 45 are provided. A layer regulating member 46 for regulating the layer thickness of the developer is disposed close to the developing roller 42.
The developing devices 40 are similarly configured except for the developer contained in the developing housing 41, and form toner images of yellow (Y), magenta (M), cyan (C) and black (K) 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、露光ヘッド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 the latent image forming light emitted from the exposure head 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 includes an intermediate transfer belt 51 on which the toner images of the respective colors formed on the photosensitive drums 31 of the respective photosensitive unit 30 are multiply transferred, and an intermediate transfer belt of the respective color toner images formed on the respective photosensitive units 30. A primary transfer roller 52 that sequentially transfers (primary transfer) to 51, and a secondary transfer roller 53 that collectively transfers (secondary transfer) toner images on the intermediate transfer belt 51 onto the sheet 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 unit 11. Electrostatic transfer (primary transfer) is sequentially performed on the upper side, and a superimposed toner image in which toners of respective colors are superimposed is formed.

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TR)に搬送される。重畳トナー像が二次転写部TR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TR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。   The superimposed toner image on the intermediate transfer belt 51 is conveyed to a region (secondary transfer portion TR) in which the secondary transfer roller 53 is disposed as the intermediate transfer belt 51 moves. When the superimposed toner image is conveyed to the secondary transfer portion TR, the sheet P is supplied from the sheet feeding device 20 to the secondary transfer portion TR in accordance with the timing. Then, a predetermined transfer voltage is applied to the secondary transfer roller 53 from the power supply device 70 controlled by the image forming apparatus control unit 11, the sheet P is sent out from the registration roller pair 23, and the sheet 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。   The residual toner on the surface of the photosensitive drum 31 is removed by the cleaning blade 34 and collected in a waste developer storage portion. The surface of the photosensitive drum 31 is recharged by the charging roller 32. Incidentally, the residue which can not be completely removed by the cleaning blade 34 and is attached to the charging roller 32 is captured and accumulated on the surface of the cleaning roller 33 which rotates in contact with the charging roller 32.

定着装置60は、加熱源612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部N(定着領域)が形成される。   The fixing device 60 includes a heating module 61 including a heating source 612 and a pressure module 62. The pressure contact area of 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 sheet P on which the toner image has been transferred in the transfer device 50 is conveyed to the fixing device 60 via the conveyance guide in a state where the toner image is not fixed. The sheet P conveyed to the fixing device 60 is fixed in a toner image by the action of pressure bonding and heating by the pair of heating modules 61 and the pressure module 62.
The sheet P on which the fixed toner image is formed is discharged from the discharge roller pair 69 to the discharge tray 1 a on the upper surface of the image forming apparatus 1 through the conveyance roller pair 68.

(2)定着装置60の構成
図2は定着装置60の全体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は加熱モジュール61の構成の一態様を説明する断面模式図、図5は加熱モジュール61の長手方向の構成を説明する縦断面模式図、図6は加熱モジュール61の構成の他の態様を説明する断面模式図、図7は低熱伝導部613と高熱伝導部614の接触を説明する斜視図、図8(a)は定着装置60における立ち上がり時の熱移動を説明する説明図、(b)は印刷時の熱移動を説明する説明図である。
(2) Configuration of Fixing Device 60 FIG. 2 is a schematic cross sectional view showing the entire configuration of the fixing device 60, FIG. 3 is a schematic plan view showing the configuration of the heating source 612, and FIG. 5 is a longitudinal cross-sectional schematic view explaining the configuration of the heating module 61 in the longitudinal direction, FIG. 6 is a schematic cross-sectional view explaining the other aspect of the configuration of the heating module 61, and FIG. 8A is an explanatory view for explaining the heat transfer at the time of start-up in the fixing device 60, and FIG. 8B is an explanatory view for explaining the heat transfer at the time of printing. .

(2.1)定着装置の全体構成
定着装置60は、加熱手段の一例としての加熱モジュール61と加圧手段の一例としての加圧モジュール62から構成されている。
(2.1) Overall Configuration of Fixing Device The fixing device 60 includes a heating module 61 as an example of a heating unit and a pressure module 62 as an example of a pressure unit.

加熱モジュール61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と、定着ベルト611の内面が接触摺動する加熱源612とを有し、加熱源612は、耐熱性の合成樹脂材料からなる低熱伝導部613及び耐熱・電気絶縁性材料である酸化アルミニウムからなる高熱伝導部614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617で保持されている。保持部材617は、加熱源612の保持機能と共に定着ベルト611の回転を案内するガイドの機能も有している。
そして、保持部材617が金属で構成され大きな曲げ強度を有する支持部材618で支持されている。
The heating module 61 includes a fixing belt 611 as an example of a belt member used for fixing a toner image on the sheet P, and a heating source 612 with which the inner surface of the fixing belt 611 contacts and slides. It is made of a heat-resistant synthetic resin such as polyethylene terephthalate (PET) through a low heat conductive portion 613 made of a heat resistant synthetic resin material and a high heat conductive portion 614 made of aluminum oxide which is a heat resistant / electrical insulating material. It is held by a holding member 617. The holding member 617 also has the function of a guide for guiding the rotation of the fixing belt 611 as well as the holding function of the heat source 612.
The holding member 617 is supported by a supporting member 618 which is made of metal and has high bending strength.

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 includes a pressure roller 621 and a pressure mechanism (not shown) including a pressure spring (not shown) for pressing the pressure roller 621 against the heating module 61.
The pressure roller 621 further includes, for example, a cylindrical core member 622 made of metal, and a heat-resistant elastic layer 623 (for example, a silicone rubber layer, a fluorine rubber layer, etc.) coated on the outer peripheral surface of the core member 622. If necessary, a surface release layer 624 made of, for example, a heat resistant resin coating such as PFA or a heat resistant rubber coating is laminated and configured.

加圧ローラ621は、モータ(不図示)から動力を受けて図中時計回り方向(図2中 矢印R方向)に回転する。加圧ローラ621が回転することによって、定着ベルト611が従動して図中半時計回り方向(図2中 矢印R方向)に回転する。用紙Pが定着ニップ部Nで挟持されて搬送されることにより、定着ベルト611の表面が接触する用紙Pのトナー像は加熱源612の熱が伝達されることで用紙Pに加熱定着される。   The pressure roller 621 receives power from a motor (not shown) and rotates clockwise (in the direction of arrow R in FIG. 2) in the drawing. When the pressure roller 621 rotates, the fixing belt 611 follows and rotates in the counterclockwise direction (the direction of arrow R in FIG. 2). The sheet P is nipped and conveyed by the fixing nip N, whereby the toner image of the sheet P with which the surface of the fixing belt 611 is in contact is heated and fixed to the sheet P by the heat of the heating source 612 being transmitted.

定着ベルト611は、基材層、トナー像の定着性を向上させる弾性層、最上層に被覆された表面離型層からなる多層構造のベルト部材である。基材層としては、例えば、厚さ50μm〜200μmの樹脂材料等(例えばポリイミド樹脂)が用いられる。弾性層は、定着対象となる用紙Pに各色トナーが積層して形成され、ニップ部においてトナー像の全体に均一に熱を供給するために、用紙P上のトナー像の凹凸に倣って定着ベルト611表面が変形することが好ましく、例えば厚みが100μm〜600μm、硬度が10°〜30°(JIS−A)のシリコーンゴムが用いられている。尚、白黒の画像形成装置であれば、弾性層を省略することができる。
表面離型層は、用紙P上で溶融されたトナーとの接着力を弱めて、用紙Pを定着ベルト611から剥離しやすくするために、例えば、PFA(テトラフルオロエチレンパーフルオロアルキルビニルエーテル重合体)、PTFE(ポリテトラフルオロエチレン)、シリコーン共重合体、またはこれらの複合層等が用いられている。
The fixing belt 611 is a multi-layered belt member including a base material layer, an elastic layer for improving the fixing property of the toner image, and a surface release layer coated on the uppermost layer. As a base material layer, a resin material etc. (for example, polyimide resin) with a thickness of 50 micrometers-200 micrometers are used, for example. The elastic layer is formed by laminating toners of respective colors on the sheet P to be fixed, and the fixing belt follows the unevenness of the toner image on the sheet P in order to uniformly supply heat to the entire toner image at the nip portion. It is preferable that the surface of the surface 611 is deformed. For example, silicone rubber having a thickness of 100 μm to 600 μm and a hardness of 10 ° to 30 ° (JIS-A) is used. In the case of a black and white image forming apparatus, the elastic layer can be omitted.
For example, PFA (tetrafluoroethylene perfluoroalkyl vinyl ether polymer) is used to weaken the adhesion of the sheet P to the fixing belt 611 by weakening the adhesion with the toner melted on the sheet P. PTFE (polytetrafluoroethylene), silicone copolymers, or composite layers thereof are used.

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)に沿って延びる加熱源612が設けられている。加熱源612は長手方向に延びる面状発熱体であり、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 heating 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. . The heating source 612 is a sheet-like heating element extending in the longitudinal direction, and the heating source 612 heats the fixing belt 611 to a predetermined temperature.

加熱源612は、例えばステンレス鋼(SUS)やセラミックで形成された基材612Aと、基材612A上に形成された銀・パラジウム(Ag・Pd)合金を主成分とする抵抗発熱体612Bと、銀・パラジウム(Ag・Pd)合金を主体とする導電パターン612Cと、抵抗発熱体612B及び導電パターン612Cを覆う絶縁性(本実施形態ではガラス)の絶縁体612Dと、銀・パラジウム(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。   The heating source 612 includes, for example, a base 612A formed of stainless steel (SUS) or ceramic, and a resistance heating element 612B mainly composed of a silver-palladium (Ag-Pd) alloy formed on the base 612A. A conductive pattern 612C mainly composed of a silver-palladium (Ag-Pd) alloy, an insulator (in the present embodiment, a glass) insulator 612D covering the resistance heating element 612B and the conductive pattern 612C, silver-palladium (Ag-Pd) ) Has a feed electrode 612E made of a good conductor film made of an alloy, and is connected to a power supply (not shown) to receive a feed.

加熱源612の定着ベルト611の内面と接触する面と反対側の面には低熱伝導部613が接触している。低熱伝導部613は、耐熱性の合成樹脂材料、例えばポリフェニレンテレフタレート(PET)、ポリフェニレンスルファイド(PPS)、液晶ポリマー(LCP)、ポリアミドイミド(PAI)、ポリエーテルエーテルケトン(PEEK)等で形成されている。低熱伝導部613は、後述する高熱伝導部614への熱伝導を抑制して、加熱源612の通電開始時の立ち上がり時間の悪化を抑制している。   The low heat conducting portion 613 is in contact with the surface of the heat source 612 opposite to the surface in contact with the inner surface of the fixing belt 611. The low thermal conductive portion 613 is formed of a heat resistant synthetic resin material such as polyphenylene terephthalate (PET), polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polyamide imide (PAI), polyetheretherketone (PEEK), etc. ing. The low thermal conductivity portion 613 suppresses thermal conduction to the high thermal conductivity portion 614 described later, thereby suppressing the deterioration of the rising time of the heating source 612 at the start of the energization.

低熱伝導部613の加熱源612と接触している面と反対側の面には、高熱伝導部614が接触している。高熱伝導部614は、例えば厚み5mm〜10mmのアルミ板(JIS A1050)からなり、加熱源612の熱量を長手方向に移動させることで、基材612A全域に渡る温度均一化の効果と消費電力低減効果を有する。   The high thermal conductivity portion 614 is in contact with the surface of the low thermal conductivity portion 613 opposite to the surface in contact with the heating source 612. The high thermal conductivity portion 614 is made of, for example, an aluminum plate (JIS A1050) with a thickness of 5 mm to 10 mm, and moves the amount of heat of the heating source 612 in the longitudinal direction to reduce temperature consumption and power consumption across the entire base 612A. Have an effect.

図2、図4に示すように、高熱伝導部614の低熱伝導部613とは反対側の面には、サーミスタ615が当接して設けられ、高熱伝導部614及び低熱伝導部613を貫通して加熱源612の抵抗発熱体612Bとは反対側の面には、サーモスタット616が当接して配置されている。
サーミスタ615及びサーモスタット616は、コイルばねSR(図2 参照)によって、付勢されて高熱伝導部614、加熱源612に当接することで、安定した熱応答性を得るようになっている。
As shown in FIGS. 2 and 4, a thermistor 615 is provided in contact with the surface of the high thermal conductivity portion 614 opposite to the low thermal conductivity portion 613, and penetrates the high thermal conductivity portion 614 and the low thermal conductivity portion 613. A thermostat 616 is disposed in contact with the surface of the heat source 612 opposite to the resistance heating element 612B.
The thermistor 615 and the thermostat 616 are biased by a coil spring SR (see FIG. 2) to abut the high thermal conductivity portion 614 and the heating source 612 to obtain stable thermal response.

加熱源612の温度はサーミスタ615で検知され、その検知温度に基づいて加熱源612が所定の目標設定温度に温調制御され、定着ベルト611がその温度に加熱される。
具体的には、画像形成装置1は、サーミスタ615の検知温度と加熱源612の設定温度に基づき、例えばその差分から加熱源612が目標温度に達するように連続的に投入電力に対してフィードバック制御を行うPI制御により、供給するべき電力を算出する。更に供給する電力に対応した位相角(位相制御)、波数(波数制御)の制御レベルに換算し、その制御条件によりトライアック(不図示)を制御している。
The temperature of the heat source 612 is detected by the thermistor 615, and the heat source 612 is temperature-controlled to a predetermined target set temperature based on the detected temperature, and the fixing belt 611 is heated to that temperature.
Specifically, based on the detected temperature of the thermistor 615 and the set temperature of the heating source 612, for example, the image forming apparatus 1 performs feedback control on input power continuously so that the heating source 612 reaches the target temperature from the difference. Perform PI control to calculate the power to be supplied. Furthermore, it converts into the control level of the phase angle (phase control) and wave number (wave number control) corresponding to the supplied electric power, and controls the triac (not shown) according to the control condition.

そしてトライアックがショートするなど、電力制御部の故障などにより、加熱モジュール61が定常状態を越えた発熱状態になった場合には、サーモスタット616が動作し、加熱源612への電力供給を遮断する。また、サーミスタ615の検知温度が所定の温度以上を検知した場合、リレーを非通電状態とし、加熱源612への電力供給を遮断する。   When the heating module 61 is in a heat generation state beyond the steady state due to a failure of the power control unit, such as a short circuit of the TRIAC, the thermostat 616 operates to cut off the power supply to the heating source 612. When the temperature detected by the thermistor 615 detects a predetermined temperature or higher, the relay is deenergized to cut off the power supply to the heating source 612.

(2.2)低熱伝導部及び高熱伝導部の構成
低熱伝導部613はその一面613aが、図4、図5に示すように、加熱源612の横長の直方体形状の基材612Aに接触して配置されている。具体的には、図4に示すように、低熱伝導部613は、加熱源612の幅方向(X方向)において、幅Wが加熱源612の基材612Aを覆うように基材612Aの幅W0よりも広く、図5に示すように、加熱源612の長手方向(Y方向)において長さLが、加熱源612の抵抗発熱体612Bの長さL0よりも長く形成され、加熱源612と高熱伝導部614とが接触することがない構成となっている。
(2.2) Configuration of low thermal conductivity portion and high thermal conductivity portion The low thermal conductivity portion 613 has its one surface 613a in contact with the horizontally long rectangular parallelepiped base material 612A of the heating source 612 as shown in FIG. 4 and FIG. It is arranged. Specifically, as shown in FIG. 4, the low thermal conductivity portion 613 has the width W 0 of the base 612 A so that the width W covers the base 612 A of the heating source 612 in the width direction (X direction) of the heating source 612. As shown in FIG. 5, the length L is longer than the length L 0 of the resistance heating element 612 B of the heating source 612, and the heating source 612 and the high-temperature heat The configuration is such that the conductive portion 614 does not contact.

図6には、加熱源612と高熱伝導部614とが接触することがない構成の他の態様を示している。図6に示すように、加熱源612のうち定着ベルト611に近い面(絶縁体612D)と反対側の面(基材616A)が低熱伝導部613と接触している。
高熱伝導部614は、図6に示すように、加熱源612の長手方向と交差する方向(幅方向)において、抵抗発熱体612Bの両外側(図6中に図示する614a)が厚く形成され、加熱源612の基材612Aの両端部612Aaと接触し、全体は加熱源612とは接触しない構成となっている。
これにより、加熱源612のうち定着ベルト611に近い面と反対側の面が高熱伝導部614と接触する構成と比べて、加熱源612の発熱部表面温度の立ち上がり時間を短縮することができる。
FIG. 6 shows another aspect of the configuration in which the heat source 612 and the high thermal conductivity portion 614 do not come in contact with each other. As shown in FIG. 6, the surface (base material 616A) opposite to the surface (insulator 612D) close to the fixing belt 611 in the heating source 612 is in contact with the low thermal conductivity portion 613.
In the high thermal conductivity portion 614, as shown in FIG. 6, both outer sides (614a shown in FIG. 6) of the resistance heating element 612B are formed thick in the direction (width direction) intersecting the longitudinal direction of the heating source 612, It contacts with both ends 612Aa of base 612A of heating source 612, and the whole does not contact heating source 612.
Thus, the rise time of the surface temperature of the heat generating portion of the heat source 612 can be shortened as compared with a configuration in which the surface on the opposite side to the surface near the fixing belt 611 in the heat source 612 contacts the high thermal conductivity portion 614.

また、高熱伝導部614は、図5、図7に示すように、高熱伝導部614のうち低熱伝導部613と接触する面には凹部が長手方向全域には形成されていない。具体的には、サーモスタット616の取り付けのための高熱伝導部614及び低熱伝導部613を貫通する貫通孔616aを除いて、高熱伝導部614の低熱伝導部613の上面(加熱源612と反対側の面)と接触する面(図7中 網掛部参照)には凹部は形成されず、低熱伝導部613と全面で接触している。
その結果、高熱伝導部614のうち低熱伝導部613と接触する面に凹部が長手方向全域に形成されている構成と比べて、高熱伝導部614の低熱伝導部613と接触する面積が増大して加熱源612の発熱部表面の発熱分布をより均一化することができる。
Further, as shown in FIG. 5 and FIG. 7, the high thermal conductivity portion 614 has no recess formed in the entire area in the longitudinal direction on the surface of the high thermal conductivity portion 614 in contact with the low thermal conductivity portion 613. Specifically, the upper surface of the low thermal conductivity portion 613 of the high thermal conductivity portion 614 (on the opposite side to the heating source 612, except for the through holes 616a passing through the high thermal conductivity portion 614 and the low thermal conductivity portion 613 for mounting the thermostat 616. No concave portion is formed on the surface (see the shaded portion in FIG. 7) which is in contact with the surface, and the entire surface is in contact with the low heat conducting portion 613.
As a result, the area of the high thermal conductivity portion 614 in contact with the low thermal conductivity portion 613 is increased compared to the configuration in which the recess is formed on the entire surface in the longitudinal direction on the surface of the high thermal conductivity portion 614 in contact with the low thermal conductivity portion 613. The heat generation distribution on the surface of the heat generating portion of the heat source 612 can be made more uniform.

このように、加熱源612が低熱伝導部613と接触し、高熱伝導部614と接触しないように配置することで、図8(a)に模式的に示すように、通電開始直後の立ち上がり時には、低熱伝導部613が高熱伝導部614への熱伝導(図8(a)中 矢印H2参照)を抑制し、加熱源612の抵抗発熱体612Bで発生する熱は、主として定着ベルト611を介して加圧ローラ621側へ伝達される(図8(a)中 矢印H1参照)。その結果、高熱伝導部614への熱伝導を抑制して、加熱源612の通電開始時の立ち上がり時間の悪化を抑制している。   As described above, by arranging the heating source 612 to be in contact with the low thermal conductivity portion 613 and not to be in contact with the high thermal conductivity portion 614, as schematically shown in FIG. The low thermal conductivity portion 613 suppresses thermal conduction to the high thermal conductivity portion 614 (see arrow H2 in FIG. 8A), and the heat generated by the resistance heating element 612B of the heating source 612 is mainly transferred through the fixing belt 611. The pressure is transmitted to the pressure roller 621 side (see arrow H1 in FIG. 8A). As a result, the heat conduction to the high thermal conductivity portion 614 is suppressed, and the deterioration of the rise time at the start of the energization of the heating source 612 is suppressed.

また、立ち上がり後のプリント時には、図8(b)に模式的に示すように、加熱源612の抵抗発熱体612Bで発生する熱は、高熱伝導部614へも伝達される(図8(b)中 矢印H2参照)。高熱伝導部614は、加熱源612の幅方向(X方向)において、低熱伝導部613を覆うように低熱伝導部613よりも広く、図5に示すように、加熱源612の長手方向(Y方向)において、加熱源612の抵抗発熱体612Bよりも長く形成されている。
これにより、高熱伝導部614が、低熱伝導部613全体を覆う構成となり、低熱伝導部613を介して伝達される加熱源612の熱量を長手方向に移動させることで、加熱源612の非通紙領域の過度な温度上昇を抑制することができる。
Further, at the time of printing after rising, as schematically shown in FIG. 8B, the heat generated by the resistance heating element 612B of the heating source 612 is also transmitted to the high thermal conductivity portion 614 (FIG. 8B) Middle arrow H2). The high thermal conductivity portion 614 is wider than the low thermal conductivity portion 613 so as to cover the low thermal conductivity portion 613 in the width direction (X direction) of the thermal source 612, and as shown in FIG. And the resistance heating element 612B of the heating source 612 is formed longer.
As a result, the high thermal conductivity portion 614 covers the entire low thermal conductivity portion 613, and the amount of heat of the thermal source 612 transmitted through the low thermal conductivity portion 613 is moved in the longitudinal direction, whereby the non-sheet-passing of the thermal source 612 is performed. Excessive temperature rise in the region can be suppressed.

また、低熱伝導部613は、加熱源612の長手方向(Y方向)において、基材612Aよりも短く形成されている。これにより、加熱源612の長手方向において断熱が不要な領域の断熱を抑制することができる。   The low thermal conductivity portion 613 is formed shorter than the base 612A in the longitudinal direction (Y direction) of the heating source 612. Thereby, the heat insulation of the area | region where heat insulation is unnecessary in the longitudinal direction of the heat source 612 can be suppressed.

「変形例1」
図9は変形例1に係る低熱伝導部613Aを有する加熱モジュール61Aの構成を示す断面模式図である。
低熱伝導部613Aは、図9に示すように、加熱源612の長手方向と交差する方向(幅方向)において、厚みが両端側に比べて中央部が厚く形成されている。これにより、加熱源612の抵抗発熱体612Bで発生する熱が低熱伝導部613Aの厚さが厚く形成された中央部から高熱伝導部614へ伝達されやすく、通電開始時の立ち上がり時間の増加を抑制することができる。
"Modification 1"
FIG. 9 is a schematic cross-sectional view showing the configuration of a heating module 61A having a low thermal conductivity portion 613A according to the first modification.
As shown in FIG. 9, in the direction (width direction) intersecting the longitudinal direction of the heat source 612, the low heat conducting portion 613A is formed such that its central portion is thicker than its both ends in the thickness direction. Thus, the heat generated by the resistance heating element 612B of the heating source 612 is easily transmitted from the central portion where the low thermal conductive portion 613A is thickly formed to the high thermal conductive portion 614, thereby suppressing an increase in rise time at the start of energization. can do.

「変形例2」
図10は変形例2に係る高熱伝導部614Aを有する加熱モジュール61Bの構成を示す断面模式図である。
高熱伝導部614Aは、加熱源612の長手方向と交差する方向(幅方向)において、抵抗発熱体612Bの両外側(図8中に図示する614Aa)が厚く形成されている。加熱源612の抵抗発熱体612Bで発生する熱は、低熱伝導部613を介して上方へ伝達されやすく、高熱伝導部614Aの抵抗発熱体612Bに対向する領域(図10中に図示する614Ab)の厚さが薄い方が、立ち上がり時間の増加は抑制される。一方、高熱伝導部614Aの厚さが薄い場合、加熱源612の熱量を長手方向に移動させにくく、長手方向に渡る温度均一化の効果が低くなることが知られている。
"Modification 2"
FIG. 10 is a schematic cross-sectional view showing the configuration of a heating module 61B having a high thermal conductivity portion 614A according to the second modification.
In the high thermal conductivity portion 614A, both outer sides (614Aa shown in FIG. 8) of the resistance heating element 612B are formed thick in the direction (width direction) intersecting the longitudinal direction of the heating source 612. The heat generated by the resistance heating element 612B of the heating source 612 is easily transferred upward through the low thermal conductivity portion 613, and the region of the high thermal conductivity portion 614A facing the resistance heating element 612B (614Ab illustrated in FIG. 10). The thinner the thickness, the more the rise time is suppressed. On the other hand, it is known that when the thickness of the high thermal conductivity portion 614A is thin, it is difficult to move the heat quantity of the heating source 612 in the longitudinal direction, and the effect of temperature equalization across the longitudinal direction becomes low.

変形例2に係る高熱伝導部614Aは、加熱源612の長手方向と交差する方向(幅方向)において、抵抗発熱体612Bの両外側(614Aa)の厚さを厚く形成することで、通電開始時の立ち上がり時間の増加を抑制しながら、加熱源612の熱量を長手方向により移動させやすくして非通紙領域の過度な温度上昇を抑制することができる。   The high thermal conductivity portion 614A according to the modification 2 is formed by increasing the thickness of both outer sides (614Aa) of the resistance heating element 612B in the direction (width direction) intersecting the longitudinal direction of the heating source 612, at the start of energization. The heat quantity of the heat source 612 can be easily moved in the longitudinal direction while suppressing an increase in the rise time of the sheet, thereby suppressing an excessive temperature rise in the non-sheet-passing area.

「変形例3」
図11は変形例3に係る低熱伝導部613Bを有する加熱モジュール61Cの構成を示す断面模式図である。
低熱伝導部613Bは、図11に示すように、加熱源612と高熱伝導部614との間に設けられた空気層として形成されている。空気層はPET(ポリフェニレンテレフタレート)やLCP(液晶ポリマー)等の耐熱性の合成樹脂材料と比べて熱伝導率が低く、加熱源612から高熱伝導部614への熱伝導を抑制して、低コストで加熱源612の通電開始時の立ち上がり時間の悪化を抑制することができる。
"Modification 3"
FIG. 11 is a schematic cross-sectional view showing the configuration of a heating module 61C having a low thermal conductive portion 613B according to the third modification.
The low thermal conductivity portion 613 B is formed as an air layer provided between the heat source 612 and the high thermal conductivity portion 614 as shown in FIG. The air layer has lower thermal conductivity than heat-resistant synthetic resin materials such as PET (polyphenylene terephthalate) and LCP (liquid crystal polymer), and suppresses the thermal conduction from the heating source 612 to the high thermal conductivity portion 614 to reduce cost. Thus, it is possible to suppress the deterioration of the rise time of the heating source 612 at the start of energization.

「変形例4」
図12は変形例4に係る低熱伝導部613Cを有する加熱モジュール61Dの構成を示す断面模式図である。
低熱伝導部613Cは、図12に示すように、記録媒体としての用紙Pの搬送方向(X方向)における幅W1が、高熱伝導部614の用紙Pの搬送方向(X方向)における幅W2よりも広く形成されている。すなわち、加熱源612と高熱伝導部614の間に配置される耐熱性の合成樹脂材料からなる低熱伝導部613Cが長手方向(Y方向)と交差する幅方向においても高熱伝導部614よりも幅広(W1>W2)となるように配置されている。
これにより、高熱伝導部614が、より確実に加熱手段である加熱源612と接触しない構成とすることができる。
"Modification 4"
FIG. 12 is a schematic cross-sectional view showing the configuration of a heating module 61D having a low thermal conductive portion 613C according to the fourth modification.
As shown in FIG. 12, the low thermal conductivity portion 613C has a width W1 in the conveyance direction (X direction) of the sheet P as a recording medium that is greater than the width W2 in the conveyance direction (X direction) of the high thermal conductivity portion 614 It is widely formed. That is, the low thermal conductivity portion 613C made of a heat resistant synthetic resin material disposed between the heating source 612 and the high thermal conductivity portion 614 is wider than the high thermal conductivity portion 614 even in the width direction intersecting the longitudinal direction (Y direction) ( It is arrange | positioned so that it may become W1> W2).
Thus, the high thermal conductivity portion 614 can be more reliably prevented from coming into contact with the heating source 612 which is the heating means.

(実施例1)
図13は定着装置60の立ち上がり時間と低熱伝導部613の厚さとの関係を示す図である。
図5に示す加熱モジュール61において、加熱源612は、アルミナで形成された基材612Aのサイズが、厚み1mm、長手方向の長さ250mm、長手方向に直交する方向の長さ(幅)7mmである。また、抵抗発熱体612Bは、銀パラジウムからなる電気抵抗材料をスクリーン印刷により厚み約10μm、長手方向の長さ216mm、幅1.0mmで塗工して2本形成し、絶縁体612Dとしてガラスをコーティングした。
Example 1
FIG. 13 is a view showing the relationship between the rise time of the fixing device 60 and the thickness of the low heat conducting portion 613. As shown in FIG.
In the heating module 61 shown in FIG. 5, the heating source 612 has a base material 612A made of alumina and having a thickness of 1 mm, a length of 250 mm in the longitudinal direction, and a length (width) of 7 mm in the direction orthogonal to the longitudinal direction. is there. The resistance heating element 612B is formed by coating an electrical resistance material consisting of silver palladium by screen printing with a thickness of about 10 μm, a length in the longitudinal direction of 216 mm, and a width of 1.0 mm, and glass is used as the insulator 612D. Coated.

高熱伝導部614は、アルミ板(JIS A1050)からなり、厚み10mm、長手方向の長さ250mm、長手方向に直交する方向の長さ(幅)7mmである。
低熱伝導部613は、長手方向の長さ250mm、長手方向に直交する方向の長さ(幅)7mmで、厚みを0mm(低熱伝導部613がなく、高熱伝導部614が加熱源612の基材612Aに接触している構成)から、0.1mmごとに2.0mmまで変化させた。また、低熱伝導部613の材料は、PET(ポリフェニレンテレフタレート)とPI(ポリイミド)の2種類を用いた。
The high thermal conductivity portion 614 is made of an aluminum plate (JIS A1050), and has a thickness of 10 mm, a length of 250 mm in the longitudinal direction, and a length (width) of 7 mm in the direction orthogonal to the longitudinal direction.
The low thermal conductivity portion 613 has a length of 250 mm in the longitudinal direction and a length (width) 7 mm in the direction orthogonal to the longitudinal direction, and has a thickness of 0 mm (without the low thermal conductivity portion 613; the high thermal conductivity portion 614 is the base material of the heating source 612 The configuration in contact with 612 A) was changed to 2.0 mm every 0.1 mm. Further, as a material of the low thermal conductive portion 613, two types of PET (polyphenylene terephthalate) and PI (polyimide) were used.

係る構成の定着装置60の加熱源612へ850Wの電力を印加して、定着ベルト611の表面温度が定着可能温度となるまでの時間としての立ち上がり時間tを計測した。
立ち上がり時間tの悪化は、低熱伝導部613の熱伝導度が低いPI(ポリイミド)樹脂のほうが抑制することができる。また、立ち上がり時間tの悪化は、厚みの増加とともに短くなり、PET(ポリフェニレンテレフタレート)及びPI(ポリイミド)のいずれの材料であっても厚みが1.0mm以上であれば、高熱伝導部614が加熱源612と接触していない場合(立ち上がり時間t=3.0sec)と比較して、0.1secの悪化に留まった。
A power of 850 W was applied to the heating source 612 of the fixing device 60 having such a configuration, and the rise time t was measured as the time until the surface temperature of the fixing belt 611 became the fixable temperature.
The deterioration of the rise time t can be suppressed in the PI (polyimide) resin having a low thermal conductivity of the low thermal conductive portion 613. In addition, the deterioration of the rise time t becomes shorter as the thickness increases, and the high thermal conductivity portion 614 is heated if the thickness is 1.0 mm or more, whichever material is PET (polyphenylene terephthalate) or PI (polyimide). Compared with the case where the source 612 was not in contact (rise time t 0 = 3.0 sec), the deterioration was only 0.1 sec.

(実施例2)
図14は実施例2に係る定着装置60の加熱モジュール61の長手方向の縦断面模式図、図15は定着装置60における非通紙部Sの定着ベルト611の温度と高熱伝導部614の厚さとの関係を示す図である。
図14に示す定着装置60において、加熱源612は、アルミナで形成された基材612Aのサイズは、厚み1mm、長手方向の長さ250mm、長手方向に直交する方向の長さ(幅)7mmである。また、抵抗発熱体612Bは、銀パラジウムからなる電気抵抗材料をスクリーン印刷により厚み約10μm、長手方向の長さ216mm、幅1.0mmで塗工して2本形成し、絶縁体612Dとしてガラスをコーティングした。
(Example 2)
FIG. 14 is a schematic longitudinal sectional view of the heating module 61 of the fixing device 60 according to the second embodiment, and FIG. 15 is the temperature of the fixing belt 611 in the non-sheet passing portion S of the fixing device 60 and the thickness of the high heat conducting portion 614 FIG.
In the fixing device 60 shown in FIG. 14, the heating source 612 is a base 612A made of alumina, having a thickness of 1 mm, a length of 250 mm in the longitudinal direction, and a length (width) of 7 mm in the direction orthogonal to the longitudinal direction. is there. The resistance heating element 612B is formed by coating an electrical resistance material consisting of silver palladium by screen printing with a thickness of about 10 μm, a length in the longitudinal direction of 216 mm, and a width of 1.0 mm, and glass is used as the insulator 612D. Coated.

低熱伝導部613は、材料がPI(ポリイミド)で、厚みを0.5mm、長手方向の長さ250mm、長手方向に直交する方向の長さ(幅)7mmである。
高熱伝導部614は、長手方向の長さ250mm、長手方向に直交する方向の長さ(幅)7mmで、厚みを1mm、5mm、10mmと変化させた。また、高熱伝導部614の材料は、それぞれ熱導電率が異なる材料として銅板とアルミ板の2種類を用いた。
The low thermal conductive portion 613 is made of PI (polyimide) and has a thickness of 0.5 mm, a length of 250 mm in the longitudinal direction, and a length (width) of 7 mm in the direction orthogonal to the longitudinal direction.
The high thermal conductivity portion 614 has a length of 250 mm in the longitudinal direction and a length (width) of 7 mm in the direction orthogonal to the longitudinal direction, and the thickness is changed to 1 mm, 5 mm, and 10 mm. Further, as the material of the high thermal conductivity portion 614, two types of copper plate and aluminum plate were used as materials having different thermal conductivity.

係る構成の定着装置60を備えた画像形成装置1を用いて、A5サイズ用紙を生産性25ppm(1分間当りの連続印刷枚数)で100〜150枚通紙して、A5サイズの外側である非通紙部S(図14中 S参照)の定着ベルト611の表面温度Tを計測した。
非通紙部Sにおける定着ベルト611の表面温度Tは、高熱伝導部614がアルミ板に比べて、熱導電率が高い銅板が低い(温度上昇が少ない)結果となった。熱伝導率が高い銅板の高熱伝導部614は、加熱源612の熱量を長手方向に移動させやすく、非通紙部Sの過度な温度上昇を抑制するためと推察される。
The image forming apparatus 1 provided with the fixing device 60 having the above configuration passes 100 to 150 sheets of A5 size paper at a productivity of 25 ppm (the number of continuously printed sheets per minute), and is non-A5 size outside The surface temperature T of the fixing belt 611 at the sheet passing portion S (see S in FIG. 14) was measured.
The surface temperature T of the fixing belt 611 at the non-sheet-passing portion S was lower (the temperature rise is smaller) in the copper plate having a high thermal conductivity compared to the aluminum plate in the high thermal conductivity portion 614. The high thermal conductivity portion 614 of the copper plate having a high thermal conductivity is easy to move the heat amount of the heating source 612 in the longitudinal direction, and it is presumed that the excessive temperature rise of the non-sheet-passing portion S is suppressed.

また、非通紙部Sにおける定着ベルト611の表面温度Tは、高熱伝導部614の厚みの増加とともに低くなり、定着ベルト611の耐熱温度が220℃である場合、銅板の高熱伝導部614で1.5mm以上、アルミ板の高熱伝導部614で4.5mm以上の厚みがあれば、25ppm以上の生産性を実現することができる。   The surface temperature T of the fixing belt 611 at the non-sheet passing portion S decreases with the increase of the thickness of the high thermal conductivity portion 614, and when the heat resistance temperature of the fixing belt 611 is 220 ° C. If the thickness is 4.5 mm or more and the thickness is 4.5 mm or more in the high thermal conductivity portion 614 of the aluminum plate, productivity of 25 ppm or more can be realized.

(実施例3)
図16は実施例3に係る定着装置60の加熱モジュール61の断面模式図、図17は定着装置60の加熱モジュール61の長手方向の縦断面模式図、図18は比較例に係る定着装置600の加熱モジュール610の断面模式図、図19は定着装置600の加熱モジュール610の長手方向の縦断面模式図である。
図18、図19に示すように、比較例に係る定着装置600は、加熱源612の基材612Aには低熱伝導部613が接触して配置され、低熱伝導部613の加熱源612と接触している面と反対側の面には高熱伝導部が配置されていない。
(Example 3)
16 is a schematic cross-sectional view of the heating module 61 of the fixing device 60 according to the third embodiment, FIG. 17 is a schematic longitudinal cross-sectional view of the heating module 61 of the fixing device 60, and FIG. 18 is a schematic view of the fixing device 600 according to the comparative example. FIG. 19 is a schematic cross-sectional view of the heating module 610 of the fixing device 600 in the longitudinal direction.
As shown in FIGS. 18 and 19, in the fixing device 600 according to the comparative example, the low thermal conductivity portion 613 is disposed in contact with the base 612A of the thermal source 612 and contacts the thermal source 612 of the low thermal conductivity portion 613. The high thermal conductivity part is not disposed on the surface opposite to the surface.

実施例3及び比較例のいずれにおいても、加熱源612は、アルミナで形成された基材612Aのサイズが、厚み1mm、長手方向の長さ250mm、長手方向に直交する方向の長さ(幅)7mmである。また、抵抗発熱体612Bは、銀パラジウムからなる電気抵抗材料をスクリーン印刷により厚み約10μm、長手方向の長さ216mm、幅1.0mmで塗工して2本形成し、絶縁体612Dとしてガラスをコーティングした。   In any of the third embodiment and the comparative example, the heating source 612 is a substrate 612A made of alumina, having a thickness of 1 mm, a length in the longitudinal direction of 250 mm, and a length in the direction orthogonal to the longitudinal direction (width) It is 7 mm. The resistance heating element 612B is formed by coating an electrical resistance material consisting of silver palladium by screen printing with a thickness of about 10 μm, a length in the longitudinal direction of 216 mm, and a width of 1.0 mm, and glass is used as the insulator 612D. Coated.

図16、図17に示すように、低熱伝導部613は、材料がPI(ポリイミド)で、厚みを0.5mm、長手方向の長さ250mm、長手方向に直交する方向の長さ(幅)7mmである。
実施例3における高熱伝導部614は、アルミ板(JIS A1050)からなり、厚み5mm、長手方向の長さ250mm、長手方向に直交する方向の長さ(幅)7mmである。
As shown in FIGS. 16 and 17, the low thermal conductive portion 613 is made of PI (polyimide) and has a thickness of 0.5 mm, a length in the longitudinal direction of 250 mm, and a length (width) in the direction orthogonal to the longitudinal direction of 7 mm It is.
The high thermal conductivity portion 614 in the third embodiment is made of an aluminum plate (JIS A1050), has a thickness of 5 mm, a length of 250 mm in the longitudinal direction, and a length (width) of 7 mm in the direction orthogonal to the longitudinal direction.

係る構成の定着装置60を備えた画像形成装置1を用いて、A5サイズ用紙を生産性25ppm(1分間当りの連続印刷枚数)で100〜150枚通紙して、A5サイズの外側である非通紙部S(図17、図19中 S参照)の定着ベルト611の表面温度Tを計測した。
非通紙部Sにおける定着ベルト611の最高温度は、比較例においては250℃を超えたが、実施例3においては、220℃以下となり、非通紙部Sにおける温度上昇が30℃以上抑制される結果となった。
The image forming apparatus 1 provided with the fixing device 60 having the above configuration passes 100 to 150 sheets of A5 size paper at a productivity of 25 ppm (the number of continuously printed sheets per minute), and is non-A5 size outside The surface temperature T of the fixing belt 611 at the sheet passing portion S (see S in FIG. 17 and FIG. 19) was measured.
The maximum temperature of the fixing belt 611 in the non-sheet passing portion S exceeds 250 ° C. in the comparative example, but in Example 3, it becomes 220 ° C. or less, and the temperature rise in the non-sheet passing portion S is suppressed by 30 ° C. or more Result.

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、600・・・定着装置
61、61A、61B、61C、61D、610・・・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
613・・・低熱伝導部
614・・・高熱伝導部
615・・・サーミスタ
616・・・サーモスタット
617・・・保持部材
618・・・支持部材
N・・・定着ニップ部
DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 10 ... Control apparatus 20 ... Paper feeding apparatus 30 ... Photosensitive body unit 31 ... Photosensitive drum 40 ... Development apparatus 42 ... Development roller 50 ... Transfer device 51: Intermediate transfer belt 53: Secondary transfer roller 60, 600: Fixing device 61, 61A, 61B, 61C, 61D, 610: Heating module 611: Fixing belt 612 Heat source 612A: base material 612B: insulating layer 612C: resistance heating element 612D: insulator 613: low thermal conductivity portion 614: high thermal conductivity portion 615: thermistor 616 .. · Thermostat 617 · · · Holding member 618 · · · Support member N · · · · · · fixing nip portion

Claims (13)

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手段と、
基材と、前記基材の表面に前記基材の長手方向に延びるように形成された発熱部からなり前記ベルト部材の内面を加熱する加熱手段と、
前記加熱手段の、前記ベルト部材に近い面と反対側の面に配置された低熱伝導部と、
前記低熱伝導部の前記加熱手段に近い面とは反対側の面に配置された高熱伝導部と、を備え、
前記加熱手段が前記低熱伝導部と接触し、かつ前記高熱伝導部と接触しないように配置されている、
ことを特徴とする定着装置。
A circulating belt member,
Pressing means for pressing the recording medium contacting the belt member and moving between the belt member and the belt member;
A substrate, and a heating unit that heats the inner surface of the belt member, the heating unit being formed on the surface of the substrate so as to extend in the longitudinal direction of the substrate;
A low heat conducting portion disposed on the side opposite to the side near the belt member of the heating means;
And a high thermal conductivity portion disposed on a surface opposite to the surface close to the heating means of the low thermal conductivity portion;
The heating means is disposed so as to be in contact with the low thermal conductivity portion and not to be in contact with the high thermal conductivity portion.
A fixing device characterized by
前記低熱伝導部の前記記録媒体の搬送方向における幅は、前記加熱手段の前記記録媒体の搬送方向における幅よりも広い、
ことを特徴とする請求項1に記載の定着装置。
The width of the low thermal conductivity portion in the conveyance direction of the recording medium is wider than the width of the heating unit in the conveyance direction of the recording medium.
The fixing device according to claim 1,
前記低熱伝導部は、長手方向において前記加熱手段の前記発熱部よりも長い、
ことを特徴とする請求項1又は2に記載の定着装置。
The low heat conducting portion is longer in the longitudinal direction than the heat generating portion of the heating means.
The fixing device according to claim 1, wherein the fixing device is provided.
前記低熱伝導部は、長手方向において前記加熱手段の前記基材よりも短い、
ことを特徴とする請求項3に記載の定着装置。
The low thermal conductivity portion is shorter than the base of the heating means in the longitudinal direction.
The fixing device according to claim 3, characterized in that:
前記高熱伝導部の前記記録媒体の搬送方向における幅は、前記加熱手段の前記記録媒体の搬送方向における幅よりも広い、
ことを特徴とする請求項1ないし4のいずれか1項に記載の定着装置。
The width of the high thermal conductivity portion in the conveyance direction of the recording medium is wider than the width of the heating unit in the conveyance direction of the recording medium.
The fixing device according to any one of claims 1 to 4, characterized in that:
前記高熱伝導部の厚さは、前記高熱伝導部の前記記録媒体の搬送方向において前記発熱部の両外側が厚い、
ことを特徴とする請求項1ないし5のいずれか1項に記載の定着装置。
The thickness of the high thermal conductivity portion is such that both outer sides of the heat generating portion are thick in the conveyance direction of the recording medium of the high thermal conductivity portion.
The fixing device according to any one of claims 1 to 5, characterized in that:
前記低熱伝導部の厚さは、前記低熱伝導部の前記記録媒体の搬送方向において中央部が厚い、
ことを特徴とする請求項6に記載の定着装置。
The thickness of the low thermal conductivity portion is thicker at a central portion in the conveyance direction of the recording medium of the low thermal conductivity portion.
The fixing device according to claim 6,
前記低熱伝導部は、前記加熱手段の全面に接触している、
ことを特徴とする請求項1、2、3、5ないし6のいずれか1項に記載の定着装置。
The low heat conducting portion is in contact with the entire surface of the heating means.
The fixing device according to any one of claims 1, 2, 3, 5 to 6, characterized in that
前記低熱伝導部の前記記録媒体の搬送方向における幅は、前記高熱伝導部の前記記録媒体の搬送方向における幅よりも広い、
ことを特徴とする請求項1に記載の定着装置。
The width of the low thermal conductivity portion in the transport direction of the recording medium is wider than the width of the high thermal conductivity portion in the transport direction of the recording medium,
The fixing device according to claim 1,
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手段と、
基材と、前記基材の表面に前記基材の長手方向に延びるように形成された発熱部からなり前記ベルト部材の内面を加熱する加熱手段と、
前記加熱手段の、前記ベルト部材に近い面と反対側の面に配置された低熱伝導部と、
前記低熱伝導部の前記加熱手段に近い面とは反対側の面に配置された高熱伝導部と、を備え、
前記高熱伝導部のうち前記低熱伝導部と接触する面には凹部が長手方向全域には形成されていない、
ことを特徴とする定着装置。
A circulating belt member,
Pressing means for pressing the recording medium contacting the belt member and moving between the belt member and the belt member;
A substrate, and a heating unit that heats the inner surface of the belt member, the heating unit being formed on the surface of the substrate so as to extend in the longitudinal direction of the substrate;
A low heat conducting portion disposed on the side opposite to the side near the belt member of the heating means;
And a high thermal conductivity portion disposed on a surface opposite to the surface close to the heating means of the low thermal conductivity portion;
In the surface of the high thermal conductivity portion in contact with the low thermal conductivity portion, a recess is not formed over the entire area in the longitudinal direction,
A fixing device characterized by
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手段と、
基材と、前記基材の表面に前記基材の長手方向に延びるように形成された発熱部からなり前記ベルト部材の内面を加熱する加熱手段と、
前記加熱手段の、前記ベルト部材に近い面と反対側の面に配置された低熱伝導部と、
前記低熱伝導部の前記加熱手段に近い面とは反対側の面に配置された高熱伝導部と、を備え、
前記加熱手段のうち前記ベルト部材に近い面と反対側の面が前記低熱伝導部と接触し、かつ前記高熱伝導部と接触しないように配置されている、
ことを特徴とする定着装置。
A circulating belt member,
Pressing means for pressing the recording medium contacting the belt member and moving between the belt member and the belt member;
A substrate, and a heating unit that heats the inner surface of the belt member, the heating unit being formed on the surface of the substrate so as to extend in the longitudinal direction of the substrate;
A low heat conducting portion disposed on the side opposite to the side near the belt member of the heating means;
And a high thermal conductivity portion disposed on a surface opposite to the surface close to the heating means of the low thermal conductivity portion;
The surface of the heating means opposite to the surface close to the belt member is disposed so as to be in contact with the low heat conduction portion and not to be in contact with the high heat conduction portion.
A fixing device characterized by
前記低熱伝導部は、耐熱合成樹脂又は空気層である、
ことを特徴とする請求項1ないし11のいずれか1項に記載の定着装置。
The low heat conducting part is a heat resistant synthetic resin or an air layer,
The fixing device according to any one of claims 1 to 11, wherein the fixing device is provided.
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12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 unit for forming an image on a recording medium;
The fixing device according to any one of claims 1 to 12, which fixes the image on the recording medium on which the image is formed by the image forming unit.
An image forming apparatus characterized by
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Publication number Priority date Publication date Assignee Title
US10935912B1 (en) * 2020-03-12 2021-03-02 Toshiba Tec Kabushiki Kaisha Heating device having first and second heat transfer units for an image forming unit
US11334011B2 (en) 2020-03-12 2022-05-17 Toshiba Tec Kabushiki Kaisha Heating device for an image forming unit of an image forming apparatus
US12038704B2 (en) 2022-09-13 2024-07-16 Toshiba Tec Kabushiki Kaisha Fixing device and image processing device

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