JP2017111392A - Fixing device and image forming apparatus - Google Patents

Fixing device and image forming apparatus Download PDF

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JP2017111392A
JP2017111392A JP2015247544A JP2015247544A JP2017111392A JP 2017111392 A JP2017111392 A JP 2017111392A JP 2015247544 A JP2015247544 A JP 2015247544A JP 2015247544 A JP2015247544 A JP 2015247544A JP 2017111392 A JP2017111392 A JP 2017111392A
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heating
heat transfer
contact
fixing
fixing device
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JP6759576B2 (en
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瀬戸隆
Takashi Seto
藤本一平
Ippei Fujimoto
石井賢治
Kenji Ishii
岸和人
Kazuto Kishi
関貴之
Takayuki Seki
吉永洋
Hiroshi Yoshinaga
澤田憲成
Kazunari Sawada
清水美沙紀
Misaki Shimizu
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Ricoh Co Ltd
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Ricoh Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a fixing device capable of preventing the occurrence of cracks or the like, even when a base material is made of a brittle material and preventing the occurrence of heat deviation, even when a recording material having such a size that a recording material edge passes through the vicinity of each center of a plurality of heating areas is continuously fixed.SOLUTION: A fixing device 12 includes a fixing member 28, a pressure member 30 which forms a fixing nip part SN between the pressure member 30 and the fixing member, a heating member 56 which is extended in a direction orthogonal to a recording material conveyance direction and comes into contact with the inner peripheral surface of the fixing member, to transmit heat, a heat transmission member 50 which is in contact with the heating member and uniformly transmits the heat of the heating member, and a support member 57 which supports the heating member and the heat transmission member from the surface of the heat transmission member which is not in contact with the heating member. The heating member includes a base material 56b, a resistance heating element 56a formed on the base material, and an OC layer 56c covering the resistance heating element 56a. The support member is in contact with the surface area of the heat transmission member with a required support interval in the recording material conveyance direction, the surface area of the heat transmission member which is not in contact with the support member is in contact with the surface area of the base material, and an area where the heat transmission member is in contact with the heating member is the same as the surface area of the base material.SELECTED DRAWING: Figure 6

Description

本発明は、定着装置及び当該定着装置を備える画像形成装置に関する。   The present invention relates to a fixing device and an image forming apparatus including the fixing device.

複写機、プリンタ、ファクシミリなどの画像形成装置では、像担持体上の画像情報に基づいてトナー像を形成し、このトナー像を用紙やＯＨＰなどの記録材上に転写する。そして、トナー像を担持した記録材を定着装置に通して、熱と圧接力により記録材上にトナー像を定着する。   In an image forming apparatus such as a copying machine, a printer, or a facsimile, a toner image is formed based on image information on an image carrier, and the toner image is transferred onto a recording material such as paper or OHP. Then, the recording material carrying the toner image is passed through a fixing device, and the toner image is fixed on the recording material by heat and pressure contact force.

定着装置には、省エネルギー化を実現するために、ベルト方式又はフィルム方式がよく用いられている。   In the fixing device, a belt method or a film method is often used in order to save energy.

特許文献１には、発熱体から離れる側のヒータ基板の下流側一部にセラミック板（伝熱板）を接触させ、これにより、ヒータ基板とヒーターホルダに蓄積した熱を長手方向に均一に分散させながら空気中に発散し、異常昇温を防止する構成が示されている。だが、脆性材料のガラスでヒータ基板を構成した場合、加圧ローラなどの荷重による搬送方向の応力集中のためにガラスに割れやクラックが発生するという不具合があった。また、用紙幅が小さく、用紙エッジが加熱領域の各中央付近を通過するような場合に、用紙エッジ外側の過昇温熱を発熱体と反対側に逃がす際、ガラスは熱伝導率が低いため、伝熱板の接触面積が狭いと伝熱抵抗が増大し、熱は長手方向に拡散しにくいため、発熱体面や加熱される耐熱性フィルム（定着ベルト）の熱の偏りを効果的に均一化できなかった。   In Patent Document 1, a ceramic plate (heat transfer plate) is brought into contact with a part of the downstream side of the heater substrate on the side away from the heating element, thereby uniformly distributing the heat accumulated in the heater substrate and the heater holder in the longitudinal direction. A configuration is shown that diffuses into the air while preventing abnormal temperature rise. However, when the heater substrate is made of a brittle material glass, there is a problem that the glass is cracked or cracked due to stress concentration in the conveying direction due to a load of a pressure roller or the like. In addition, when the paper width is small and the paper edge passes near each center of the heating area, the glass has low thermal conductivity when the overheated heat outside the paper edge is released to the side opposite to the heating element. If the contact area of the heat transfer plate is narrow, the heat transfer resistance increases and the heat hardly diffuses in the longitudinal direction, so that the heat bias of the heating element surface and the heat-resistant film (fixing belt) to be heated can be effectively uniformed. There wasn't.

そこで本発明は、伝熱性が低く摺動性に優れる脆性材料で加熱部材を形成しても割れやクラックの発生を防ぎ、また記録材エッジが複数の加熱領域の各中央付近を通過するようなサイズの記録材を連続で定着しても熱の偏りが発生しない定着装置を提供することを目的とする。   Therefore, the present invention prevents the occurrence of cracks and cracks even when the heating member is formed of a brittle material having low heat conductivity and excellent slidability, and the recording material edge passes near each center of the plurality of heating regions. It is an object of the present invention to provide a fixing device that does not generate a heat bias even when a recording material of a size is continuously fixed.

この課題を解決するために、未定着画像に接して回転する定着部材と、前記定着部材との間で定着ニップ部を形成する加圧部材と、記録材搬送方向と直交する方向に伸びて前記定着部材の内周面に接触して熱伝達する加熱部材と、前記加熱部材と接して前記加熱部材の熱を均一に伝達する伝熱部材と、前記加熱部材と接していない前記伝熱部材の面から前記加熱部材と伝熱部材を支持する支持部材と、を備え、前記定着ニップ部に未定着画像を担持した記録材を通して画像定着を行う定着装置において、前記加熱部材は、基材と、前記基材上に形成された抵抗発熱体と、を有し、前記支持部材は、記録材搬送方向に所要の支持間隔を有して前記伝熱部材の表面領域に接し、前記支持部材と接触していない前記伝熱部材の表面領域が、前記基材の表面領域と接し、前記伝熱部材が前記加熱部材と接する面積は前記基材の表面領域と同一である、ことを特徴とする定着装置を発案した。   In order to solve this problem, a fixing member that rotates in contact with an unfixed image, a pressure member that forms a fixing nip portion between the fixing member, and a direction that is orthogonal to the recording material conveyance direction and that extends A heating member that contacts the inner peripheral surface of the fixing member and transfers heat; a heat transfer member that contacts the heating member and uniformly transfers heat of the heating member; and a heat transfer member that does not contact the heating member. A fixing device that includes a heating member and a support member that supports the heat transfer member from a surface, and performs image fixing through a recording material that carries an unfixed image in the fixing nip portion. A resistance heating element formed on the substrate, and the support member is in contact with the surface area of the heat transfer member with a required support interval in the recording material conveyance direction and in contact with the support member The surface area of the heat transfer member that is not Contact with the surface area, the area where the heat transfer member is in contact with said heating member is identical to the surface area of the substrate, any proposed fixing apparatus characterized by.

抵抗発熱体の過剰な熱を、抵抗発熱体と反対側の基材に接触する広範囲の伝熱面を有する伝熱部材に逃がし、長手方向に拡散させることで、抵抗発熱体や定着部材における熱の偏りを効果的に均一化できる。よって、定着部材の劣化が低減され、加熱部材の割れやクラックの発生が防止され、記録材エッジが複数の加熱領域の各中央付近を通過するようなサイズの記録材を連続で定着しても、熱の偏りが発生しない。   The excess heat of the resistance heating element is released to the heat transfer member having a wide heat transfer surface that contacts the substrate opposite to the resistance heating element, and diffused in the longitudinal direction, so that the heat in the resistance heating element and the fixing member Can be effectively uniformed. Therefore, deterioration of the fixing member is reduced, cracking of the heating member and occurrence of cracks are prevented, and even if the recording material having such a size that the recording material edge passes near each center of the plurality of heating regions is continuously fixed. No heat bias occurs.

本発明の一実施形態に係る画像形成装置であるプリンタの構成を示す模式図である。1 is a schematic diagram illustrating a configuration of a printer that is an image forming apparatus according to an embodiment of the present disclosure. FIG. 本発明の一実施形態に係る定着装置を示す断面図である。1 is a cross-sectional view illustrating a fixing device according to an embodiment of the present invention. 加熱部材の用紙搬送方向と直交する方向の断面図である。It is sectional drawing of the direction orthogonal to the paper conveyance direction of a heating member. 加熱部材の平面図である。It is a top view of a heating member. 加熱部材の第２構成例を示す平面図である。It is a top view which shows the 2nd structural example of a heating member. 加熱部材、伝熱部材及び支持部材の関係を示す、用紙搬送方向と直交する方向の断面図である。It is sectional drawing of the direction orthogonal to a paper conveyance direction which shows the relationship between a heating member, a heat-transfer member, and a supporting member. 伝熱部材５０の斜視図である。3 is a perspective view of a heat transfer member 50. FIG. 伝熱部材５０と加熱部材５６の貼付方法を示す図である。It is a figure which shows the sticking method of the heat-transfer member 50 and the heating member 56. FIG.

図１は、本発明の一実施形態に係る画像形成装置であるプリンタの構成を示す模式図である。図１に示すように、プリンタは、給紙手段４と、レジストローラ対６と、像担持体である感光体ドラム８と、転写手段１０と、定着装置１２などを備える。   FIG. 1 is a schematic diagram illustrating a configuration of a printer that is an image forming apparatus according to an embodiment of the present disclosure. As shown in FIG. 1, the printer includes a paper feeding unit 4, a registration roller pair 6, a photosensitive drum 8 that is an image carrier, a transfer unit 10, a fixing device 12, and the like.

給紙手段４は、記録材である用紙Ｐが積載状態で収容される給紙トレイ１４と、給紙トレイ１４内の用紙Ｐを最上から順に一枚ずつ分離して送り出す給紙コロ１６とを有する。給紙コロ１６によって送り出された用紙Ｐは、レジストローラ対６で一旦停止され、姿勢ずれが矯正される。そして、感光体ドラム８の回転に同期するタイミング、すなわち感光体ドラム８上に形成されたトナー像の先端と用紙Ｐの搬送方向先端部の所定位置とが一致するタイミングで、レジストローラ対６により転写部位Ｎへ送られる。   The paper feed means 4 includes a paper feed tray 14 in which paper P as recording material is stored in a stacked state, and a paper feed roller 16 that separates and feeds the paper P in the paper feed tray 14 one by one in order from the top. Have. The paper P sent out by the paper feeding roller 16 is temporarily stopped by the registration roller pair 6 to correct the posture deviation. Then, at the timing synchronized with the rotation of the photosensitive drum 8, that is, the timing at which the leading edge of the toner image formed on the photosensitive drum 8 coincides with the predetermined position of the leading edge of the sheet P in the transport direction, the registration roller pair 6 It is sent to the transcription site N.

感光体ドラム８の外部には、矢印で示される回転方向順に、帯電手段である帯電ローラ１８と、露光手段の一部を構成するミラー２０とが配置されている。また、現像ローラ２２ａを備えた現像手段２２と、転写手段１０と、クリーニングブレード２４ａを備えたクリーニング手段２４とが配置されている。   Outside the photosensitive drum 8, a charging roller 18 that is a charging unit and a mirror 20 that constitutes a part of the exposure unit are arranged in the rotation direction indicated by the arrows. Further, a developing unit 22 including a developing roller 22a, a transfer unit 10, and a cleaning unit 24 including a cleaning blade 24a are disposed.

帯電ローラ１８と現像手段２２の間において、ミラー２０を介して感光体ドラム８上の露光部２６に露光光Ｌｂが照射され、走査される。   Between the charging roller 18 and the developing unit 22, exposure light Lb is irradiated on the exposure unit 26 on the photosensitive drum 8 through the mirror 20 and scanned.

感光体ドラム８が回転を始めると、感光体ドラム８の表面が帯電ローラ１８により均一に帯電される。画像情報に基づいて露光光Ｌｂが露光部２６に照射、走査され、作成すべき画像に対応した静電潜像が形成される。形成された静電潜像は、感光体ドラム８の回転により現像手段２２へ移動し、ここでトナーが供給されて可視化され、トナー像が形成される。   When the photosensitive drum 8 starts to rotate, the surface of the photosensitive drum 8 is uniformly charged by the charging roller 18. Based on the image information, the exposure light Lb is irradiated and scanned on the exposure unit 26 to form an electrostatic latent image corresponding to the image to be created. The formed electrostatic latent image is moved to the developing means 22 by the rotation of the photosensitive drum 8, where toner is supplied and visualized to form a toner image.

感光体ドラム８上に形成されたトナー像は、転写手段１０において所定のタイミングで転写部位Ｎに侵入してきた用紙Ｐ上に、転写バイアス印加により転写される。   The toner image formed on the photosensitive drum 8 is transferred to the sheet P that has entered the transfer portion N at a predetermined timing in the transfer unit 10 by applying a transfer bias.

トナー像（未定着画像）を担持した用紙Ｐは定着装置１２に向けて搬送され、定着装置１２において定着された後、排紙トレイへ排出・スタックされる。   The paper P carrying the toner image (unfixed image) is conveyed toward the fixing device 12, fixed on the fixing device 12, and then discharged and stacked on the paper discharge tray.

転写部位Ｎで転写されずに感光体ドラム８上に残った残留トナーは、感光体ドラム８の回転に伴ってクリーニング手段２４に至り、クリーニング手段２４を通過する間にクリーニングブレード２４ａにより掻き落とされて除去される。   Residual toner remaining on the photosensitive drum 8 without being transferred at the transfer portion N reaches the cleaning unit 24 as the photosensitive drum 8 rotates, and is scraped off by the cleaning blade 24 a while passing through the cleaning unit 24. Removed.

その後、感光体ドラム８上の残留電位が除電手段により除去され、次の作像工程に備えられる。   Thereafter, the residual potential on the photosensitive drum 8 is removed by the charge eliminating means, and is prepared for the next image forming step.

図２は、本発明の一実施形態に係る定着装置を示す断面図である。図２に示すように、定着装置１２は、未定着画像に接して回転する定着部材である定着ベルト２８と、定着ベルト２８の外周面に圧接し、定着ニップ部ＳＮを形成する加圧部材である加圧ローラ３０と、定着ベルト２８を内部から加熱する加熱手段６０などを備える。定着装置１２は、定着ニップ部ＳＮに未定着画像を担持した用紙Ｐを通して画像定着を行う。   FIG. 2 is a cross-sectional view showing a fixing device according to an embodiment of the present invention. As shown in FIG. 2, the fixing device 12 is a fixing belt 28 that is a fixing member that rotates in contact with an unfixed image, and a pressure member that presses against the outer peripheral surface of the fixing belt 28 to form a fixing nip portion SN. A pressure roller 30 and a heating unit 60 for heating the fixing belt 28 from the inside are provided. The fixing device 12 performs image fixing through the paper P carrying an unfixed image in the fixing nip portion SN.

定着ベルト２８は、ベルト基体と、この基体表面に被覆された弾性層と、弾性層の表面に形成された離型層とで構成されている。ベルト基体は、例えばニッケルで形成され、外径が３０ｍｍ、厚みが１０〜７０μｍである。ベルト基体はニッケルに限らず、ＳＵＳやＰＩ（ポリイミド）などの耐熱樹脂材料で形成されてもよい。弾性層は、例えばシリコーンゴムで形成され、厚みが５０〜１５０μｍである。離型層は、耐久性を高めて離型性を確保できればよく、例えばＰＦＡやＰＴＦＥなどのフッ素系樹脂で形成され、厚みが５〜５０μｍである。   The fixing belt 28 includes a belt base, an elastic layer coated on the surface of the base, and a release layer formed on the surface of the elastic layer. The belt base is made of nickel, for example, and has an outer diameter of 30 mm and a thickness of 10 to 70 μm. The belt base is not limited to nickel, and may be formed of a heat resistant resin material such as SUS or PI (polyimide). The elastic layer is made of, for example, silicone rubber and has a thickness of 50 to 150 μm. The release layer only needs to increase the durability and ensure the release property. For example, the release layer is formed of a fluorine-based resin such as PFA or PTFE and has a thickness of 5 to 50 μm.

加圧ローラ３０は、中実の鉄製の芯金３０ａと、この芯金３０ａの表面に形成された弾性層３０ｂとで構成されている。芯金３０ａは、例えば鉄製であり、外形が４０ｍｍ、厚みが２ｍｍ程度である。弾性層３０ｂは、例えばシリコーンゴムで形成され、厚みが５ｍｍ程度である。弾性層３０ｂの表面には、離型性を高めるために厚みが４０μｍ程度のフッ素樹脂（ＰＦＡ又はＰＴＦＥ）層を形成するのが望ましい。加圧ローラ３０は、付勢手段により定着ベルト２８に圧接されている。加圧ローラ３０は、画像形成装置に設けられたモータなどの駆動源からギヤを介して駆動力が伝達され、回転する。この加圧ローラ３０により定着ベルト２８が連れ回り回転する。   The pressure roller 30 includes a solid iron cored bar 30a and an elastic layer 30b formed on the surface of the cored bar 30a. The core metal 30a is made of, for example, iron, and has an outer shape of about 40 mm and a thickness of about 2 mm. The elastic layer 30b is made of, for example, silicone rubber and has a thickness of about 5 mm. It is desirable to form a fluororesin (PFA or PTFE) layer having a thickness of about 40 μm on the surface of the elastic layer 30b in order to improve the releasability. The pressure roller 30 is pressed against the fixing belt 28 by an urging unit. The pressure roller 30 is rotated by a driving force transmitted from a driving source such as a motor provided in the image forming apparatus via a gear. The fixing belt 28 is rotated by the pressure roller 30.

加熱手段６０は、用紙Ｐの搬送方向と直交する方向に伸びて定着ベルト２８の内周面に接触して熱伝達する加熱部材５６と、加熱部材５６の長手方向（紙面垂直方向）の一面に接して熱を均一に伝達する（均熱化する）伝熱部材５０とを有する。また、加熱手段６０は、加熱部材５６と接していない伝熱部材５０の面から加熱部材５６と伝熱部材５０を支持する支持部材５７を有する。加熱手段６０は、定着ニップ部ＳＮから見て順に、加熱部材５６、伝熱部材５０、支持部材５７を有している。   The heating means 60 extends in a direction perpendicular to the conveyance direction of the paper P, contacts the inner peripheral surface of the fixing belt 28 and transfers heat, and is on one surface of the heating member 56 in the longitudinal direction (perpendicular to the paper surface). And a heat transfer member 50 that contacts and uniformly transfers heat (heat equalizes). Further, the heating means 60 has a support member 57 that supports the heating member 56 and the heat transfer member 50 from the surface of the heat transfer member 50 that is not in contact with the heating member 56. The heating unit 60 includes a heating member 56, a heat transfer member 50, and a support member 57 in order from the fixing nip portion SN.

加熱手段６０は、定着ベルト２８の内周面に摺接して配設され、加圧ローラ３０とで定着ニップ部ＳＮを形成するニップ形成部材の機能を果たしている。また、加熱手段６０は定着装置１２の側板に接続されたステー６１に支持されているので、加圧ローラ３０からの圧接力による加熱手段６０の撓みが防止され、長手方向に均一なニップ幅が得られる。なお、加熱部材５６と定着ベルト２８の内周面との間には、摺動抵抗を減らすためにフッ素系のグリースなどが塗布される。   The heating means 60 is disposed in sliding contact with the inner peripheral surface of the fixing belt 28 and functions as a nip forming member that forms the fixing nip portion SN with the pressure roller 30. Further, since the heating unit 60 is supported by the stay 61 connected to the side plate of the fixing device 12, the heating unit 60 is prevented from being bent by the pressure contact force from the pressure roller 30, and a uniform nip width is formed in the longitudinal direction. can get. Note that fluorine grease or the like is applied between the heating member 56 and the inner peripheral surface of the fixing belt 28 in order to reduce sliding resistance.

定着ニップ部ＳＮの下流側に、定着ベルト２８の表面温度を検知する第１サーミスタ３４が設けられ、支持部材５７に加熱部材５６の温度を検知する第２サーミスタ３６が設けられている。また、加熱部材５６に電力を供給する電源４０と、第１、第２サーミスタの検知温度に基づいて電源４０を制御する加熱制御手段４２とが備えられている。加熱制御手段４２は、ＣＰＵ，ＲＯＭ，ＲＡＭ，Ｉ／Ｏインターフェース等を包含するマイクロコンピュータを意味する。   A first thermistor 34 that detects the surface temperature of the fixing belt 28 is provided on the downstream side of the fixing nip SN, and a second thermistor 36 that detects the temperature of the heating member 56 is provided on the support member 57. Further, a power supply 40 for supplying power to the heating member 56 and a heating control means 42 for controlling the power supply 40 based on the detected temperatures of the first and second thermistors are provided. The heating control means 42 means a microcomputer including a CPU, ROM, RAM, I / O interface and the like.

図３は、加熱部材の用紙搬送方向と直交する方向の断面図である。図３に示すように、ヒータとして構成される加熱部材５６は、板状ガラスやアルミナ等のセラミックスの低熱伝導率の基材５６ｂの上に酸化ルテニウム系の抵抗発熱体５６ａが印刷・焼成され、その上にオーバーコート（ＯＣ）層５６ｃが形成された構成となっている。よって加熱部材５６は、基材５６ｂと、前記基材上に形成された抵抗発熱体５６ａと、抵抗発熱体５６ａを覆うオーバーコート層５６ｃとから構成される。   FIG. 3 is a cross-sectional view of the heating member in a direction orthogonal to the paper transport direction. As shown in FIG. 3, a heating member 56 configured as a heater has a ruthenium oxide resistance heating element 56 a printed and fired on a low thermal conductivity base material 56 b of ceramic such as plate glass or alumina, An overcoat (OC) layer 56c is formed thereon. Therefore, the heating member 56 includes a base material 56b, a resistance heating element 56a formed on the base material, and an overcoat layer 56c that covers the resistance heating element 56a.

加熱部材５６の基材５６ｂはガラスで構成されている。これにより、長尺の基板であっても、加熱部材５６と接触する安定した平面が安価で作れる。定着ベルト２８側に位置するオーバーコート層５６ｃもガラスなどで形成されているが、基材５６ｂより薄く、基材側への伝熱よりもオーバーコート層側へ伝熱し易いため、定着ベルト２８の加熱効率が向上する。さらに、オーバーコート層５６ｃは、回転駆動される定着ベルト２８に加圧摺動するので耐摩耗部材、低摩擦係数部材であることが要求され、この観点からも基材５６ｂと同質であるガラスなどで形成されると好適である。加熱部材５６の基材５６ｂとオーバーコート層５６ｃは略同質材料で構成でき、特に共にガラスで構成することで、線膨張率の違いも生じず、剥がれや割れなどの悪影響が生じ難くなる。   The base material 56b of the heating member 56 is made of glass. Thereby, even if it is a long board | substrate, the stable plane which contacts the heating member 56 can be made at low cost. The overcoat layer 56c located on the fixing belt 28 side is also formed of glass or the like, but is thinner than the base material 56b and easily transfers heat to the overcoat layer side rather than heat transfer to the base material side. Heating efficiency is improved. Furthermore, since the overcoat layer 56c presses and slides on the rotationally driven fixing belt 28, the overcoat layer 56c is required to be a wear-resistant member and a low friction coefficient member. From this point of view, glass or the like is the same as the base material 56b. It is preferable to be formed by. The base material 56b and the overcoat layer 56c of the heating member 56 can be made of substantially the same material, and particularly when both are made of glass, there is no difference in linear expansion coefficient, and adverse effects such as peeling and cracking are less likely to occur.

図４は、加熱部材の平面図である。図４に示すように、加熱部材５６は、用紙搬送方向と直交する方向（長手方向）に複数の抵抗発熱体５６ａが配置され、抵抗発熱体５６ａには、共通配線Ｗｃｏｍと個別配線Ｗ１〜Ｗ５とが接続されている。共通配線Ｗｃｏｍと、個別配線Ｗ１〜Ｗ５とは、抵抗発熱体５６ａに対して櫛歯状の導電部を形成しており、抵抗発熱体５６ａは複数の加熱領域（Ｈ１〜Ｈ５）を有する。   FIG. 4 is a plan view of the heating member. As shown in FIG. 4, the heating member 56 has a plurality of resistance heating elements 56a arranged in a direction (longitudinal direction) orthogonal to the sheet conveying direction, and the resistance heating element 56a has a common wiring Wcom and individual wirings W1 to W5. And are connected. The common wiring Wcom and the individual wirings W1 to W5 form a comb-like conductive portion with respect to the resistance heating element 56a, and the resistance heating element 56a has a plurality of heating regions (H1 to H5).

上述した定着ベルト２８の表面温度を検知する第１サーミスタ３４や加熱部材５６の温度を検知する第２サーミスタ３６は、各加熱領域に対応して配置されている。そのため、各加熱領域は、個別配線Ｗ１〜Ｗ５をＯＮ／ＯＦＦすることで、個別に独立して加熱制御可能である。なお、端部の加熱領域Ｈ１、Ｈ５は、最大通紙サイズの両端部をカバーするように配設されている。   The first thermistor 34 that detects the surface temperature of the fixing belt 28 and the second thermistor 36 that detects the temperature of the heating member 56 are arranged corresponding to each heating region. Therefore, each heating region can be individually and independently heated by turning ON / OFF the individual wirings W1 to W5. Note that the heating regions H1 and H5 at the ends are arranged so as to cover both ends of the maximum sheet passing size.

加熱制御手段４２は、各サーミスタの検知温度や通紙サイズ情報を加味して、各加熱領域を温度制御し、加熱部材５６の加熱割合を変更する。このように、通紙サイズ情報にも応じて加熱制御することで、非通紙域の温度が高くなりすぎる事態が回避され、非通紙域の過昇温による部材の破損や画像品質の低下を抑制できる。   The heating control means 42 controls the temperature of each heating region in consideration of the detected temperature of each thermistor and the paper passing size information, and changes the heating rate of the heating member 56. In this way, by controlling the heating according to the paper passing size information, it is possible to avoid a situation where the temperature of the non-paper passing area becomes too high, and the member is damaged or the image quality is deteriorated due to excessive temperature rise in the non-paper passing area. Can be suppressed.

実際には、非通紙領域に対応する加熱領域への電力供給を完全に停止（オフ）しても良いが、極端に温度が下がり過ぎると次の画像領域の定着温度へ昇温することが間に合わないことがある。これを回避するために、画像領域の定着温度に対応する第１の目標温度よりも低いが、室温に対し所定以上の温度である第２の目標温度に温度を保つような温度制御が行われる。そのため、非通紙領域に対応する加熱領域へも給電は行われる。   Actually, the power supply to the heating area corresponding to the non-sheet passing area may be completely stopped (off). However, if the temperature is excessively lowered, the temperature may be raised to the fixing temperature of the next image area. It may not be in time. In order to avoid this, temperature control is performed such that the temperature is kept at a second target temperature that is lower than the first target temperature corresponding to the fixing temperature of the image area but is equal to or higher than a predetermined temperature with respect to room temperature. . Therefore, power is also supplied to the heating area corresponding to the non-sheet passing area.

図５は、加熱部材の第２構成例を示す平面図である。図５に示すように、長手方向中心から左右対称な位置にある加熱領域（Ｈ１とＨ５、Ｈ２とＨ４）が同時にＯＮ／ＯＦＦ可能なように構成してもよい。これにより、ＯＮ／ＯＦＦをするためのトライアックやＦＥＴなどのスイッチ素子の数を低減することができる。   FIG. 5 is a plan view showing a second configuration example of the heating member. As shown in FIG. 5, the heating regions (H1 and H5, H2 and H4) that are symmetrically located from the center in the longitudinal direction may be simultaneously turned on / off. As a result, the number of switching elements such as triacs and FETs for turning on / off can be reduced.

なお、図４、図５では加熱領域を５つとしているが、加熱領域の数を９分割など増やしてもよいし、３分割など減らしてもよい。また、加熱領域が複数に分かれていない加熱部材であっても本発明は有効である。   4 and 5, the number of heating regions is five, but the number of heating regions may be increased by 9 divisions or may be reduced by 3 divisions. Further, the present invention is effective even with a heating member in which the heating region is not divided into a plurality.

以下より、本発明の特徴的部分について説明する。
図６は、加熱部材、伝熱部材及び支持部材の関係を示す、用紙搬送方向と直交する方向の断面図である。図６に示すように、支持部材５７は、用紙搬送方向に所要の支持間隔を有して伝熱部材５０と接している。支持部材５７は、熱伝導率の低いＬＣＰなどの耐熱性樹脂で作られており、一部の面でのみ伝熱部材５０と接しているので、加熱部材５６の抵抗発熱体５６ａから伝熱部材５０へ伝達された熱は支持部材５７へほとんど伝達されない。支持部材５７とは反対側にある加熱部材５６は、一方の面が伝熱部材５０と面接触し、他方の面が回転駆動される定着ベルト２８と面接触している。支持部材５７と接触していない伝熱部材５０の表面領域は、基材５６ｂの表面領域と接し、伝熱部材５０が加熱部材５６と接する面積は基材５６ｂの表面領域と同一である。 Hereinafter, characteristic portions of the present invention will be described.
FIG. 6 is a cross-sectional view in the direction orthogonal to the paper transport direction, showing the relationship between the heating member, the heat transfer member, and the support member. As shown in FIG. 6, the support member 57 is in contact with the heat transfer member 50 with a required support interval in the paper transport direction. Since the support member 57 is made of a heat-resistant resin such as LCP having a low thermal conductivity and is in contact with the heat transfer member 50 only on a part of the surface, the support member 57 is heated from the resistance heating element 56a of the heating member 56 to the heat transfer member. The heat transferred to 50 is hardly transferred to the support member 57. The heating member 56 on the side opposite to the support member 57 has one surface in surface contact with the heat transfer member 50 and the other surface in surface contact with the fixing belt 28 that is rotationally driven. The surface area of the heat transfer member 50 not in contact with the support member 57 is in contact with the surface area of the base material 56b, and the area of the heat transfer member 50 in contact with the heating member 56 is the same as the surface area of the base material 56b.

従来、用紙エッジが複数の加熱領域（例えば、図４，５のＨ１〜Ｈ５）の各中央付近を通過するようなサイズの用紙を連続で定着する場合、用紙エッジの外側にある定着ベルトの長手方向の部分は、熱が用紙に奪われないため２００℃以上の高温になり、定着ベルトが劣化したり、加熱部材、特に図３に示す発熱部のオーバーコート層５６ｃに割れやクラックが発生したりする不具合があった。だが、上記のように構成することで、抵抗発熱体５６ａの過剰な熱を、抵抗発熱体と反対側の基材５６ｂに接触する広範囲の伝熱面を有する伝熱部材５０に逃がし、長手方向に拡散させることで、抵抗発熱体や定着ベルト２８における熱の偏りを効果的に均一化でき、上記不具合を解消できる。   Conventionally, when continuously fixing a sheet having a size such that the sheet edge passes near the center of a plurality of heating regions (for example, H1 to H5 in FIGS. 4 and 5), the length of the fixing belt outside the sheet edge is fixed. Since the heat is not taken away by the paper, the portion in the direction becomes a high temperature of 200 ° C. or more, the fixing belt deteriorates, and the heating member, particularly the overcoat layer 56c of the heat generating portion shown in FIG. There was a malfunction. However, by configuring as described above, the excess heat of the resistance heating element 56a is released to the heat transfer member 50 having a wide heat transfer surface in contact with the base material 56b opposite to the resistance heating element, and the longitudinal direction By diffusing the heat, it is possible to effectively uniformize the heat bias in the resistance heating element and the fixing belt 28, and to solve the above problems.

また、伝熱部材５０には、銅又はアルミニウムなどの熱伝導率の高い材料（例えば金属）が用いられる。そのため、加熱部材５６（抵抗発熱体５６ａ）の長手方向で発熱に偏りがある場合、熱は裏側の基材５６ｂを介して伝熱部材５０によって長手方向に伝導され、均一化される。また、伝熱部材５０と加熱部材５６が貼付により一体形成されると好ましい。加熱部材５６の基材５６ｂがガラスである場合、加熱部材５６は長手方向に細長い形状の脆性材料なので扱いが難しく、加熱部材５６の支持部材５７への組み付け装着時に、加熱部材５６が応力集中により割れてしまうことがあった。上記のように伝熱部材５０と加熱部材５６を一体で形成することで、伝熱性が低く摺動性に優れる脆性材料であるガラスで基材５６ｂを形成しても応力集中が避けられ割れやクラックを防ぐことができる。   The heat transfer member 50 is made of a material having high thermal conductivity (for example, metal) such as copper or aluminum. Therefore, when there is a bias in the heat generation in the longitudinal direction of the heating member 56 (resistance heating element 56a), the heat is conducted in the longitudinal direction by the heat transfer member 50 through the base material 56b on the back side and is made uniform. Further, it is preferable that the heat transfer member 50 and the heating member 56 are integrally formed by sticking. When the base member 56b of the heating member 56 is glass, the heating member 56 is difficult to handle because it is a brittle material elongated in the longitudinal direction. When the heating member 56 is assembled to the support member 57, the heating member 56 is caused by stress concentration. Sometimes it broke. By integrally forming the heat transfer member 50 and the heating member 56 as described above, stress concentration can be avoided even if the base material 56b is formed of glass, which is a brittle material with low heat transfer and excellent slidability. Cracks can be prevented.

図７は伝熱部材５０の斜視図、図８は伝熱部材５０と加熱部材５６の貼付方法を示す図である。
図示のように、伝熱部材５０は接着剤を充填するための複数の開口部である丸穴７０を長手方向に備えている。加熱部材５６は、伝熱部材５０と略同形状、同面積を有する。図８（ａ）に示すように、伝熱部材５０を加熱部材５６の抵抗発熱体５６ａが形成されていない表面上に載置する。次いで、図８（ｂ）に示すように、丸穴７０にシリコン系の耐熱接着剤７１などを充填・乾燥させることで、接着面を介して伝熱部材５０と加熱部材５６を密着しながら一体形成することができる。また、丸穴７０以外の領域に接着剤を付着させずに伝熱部材５０と加熱部材５６を接着剤で一体に貼付することができる。伝熱部材５０と加熱部材５６の接触面には開口部以外接着剤が介在しないため、接着剤による熱抵抗（熱伝達の阻害）を極力抑えることができる上、伝熱部材５０と加熱部材５６を強固に密着させ、良好な熱伝達を達成できる。 FIG. 7 is a perspective view of the heat transfer member 50, and FIG. 8 is a diagram showing a method for attaching the heat transfer member 50 and the heating member 56.
As illustrated, the heat transfer member 50 includes a plurality of openings 70 for filling the adhesive in the longitudinal direction. The heating member 56 has substantially the same shape and the same area as the heat transfer member 50. As shown to Fig.8 (a), the heat-transfer member 50 is mounted on the surface in which the resistance heating element 56a of the heating member 56 is not formed. Next, as shown in FIG. 8B, the heat transfer member 50 and the heating member 56 are integrated with each other through the adhesive surface by filling and drying the round hole 70 with a silicon-based heat-resistant adhesive 71 or the like. Can be formed. Further, the heat transfer member 50 and the heating member 56 can be integrally attached with the adhesive without attaching the adhesive to the region other than the round hole 70. Since there is no adhesive other than the opening on the contact surface between the heat transfer member 50 and the heating member 56, the thermal resistance (inhibition of heat transfer) due to the adhesive can be suppressed as much as possible, and the heat transfer member 50 and the heating member 56 can be minimized. Can be firmly adhered to each other to achieve good heat transfer.

また、伝熱部材５０と加熱部材５６の基材５６ｂ間における、線膨張係数の差により生じる２５０℃での長手方向の膨張長さの差分よりも大きく剪断方向に変形可能な柔らかい耐熱接着剤を用いると好ましい。具体的には、シリコン系の耐熱接着剤などを用いることで、伝熱部材５０と加熱部材５６の基材５６ｂを密着させながら高温時の線膨張に対しても接着剤を柔軟に変形させることができ、両者の膨張差による割れや撓みを防ぐことができ、良好な密着状態を確保できる。   In addition, a soft heat-resistant adhesive that is deformable in the shearing direction is larger than the difference in expansion length in the longitudinal direction at 250 ° C. caused by the difference in linear expansion coefficient between the heat transfer member 50 and the base material 56b of the heating member 56. It is preferable to use it. Specifically, by using a silicon-based heat-resistant adhesive or the like, the adhesive can be flexibly deformed against linear expansion at high temperatures while the heat transfer member 50 and the base material 56b of the heating member 56 are in close contact with each other. It is possible to prevent cracking and bending due to the difference in expansion between the two, and to ensure a good adhesion state.

図８（ａ）に示すように、丸穴７０の片側又は両側はＣ０．３ｍｍ以上の面取り部７２を有すると好ましい。ここで、「Ｃ」は面取り角度が４５°で有ることを示し、「Ｃ０．３ｍｍ」はそれぞれの面から０．３ｍｍの辺を切り落とすことを示す。面取りを施すことで、伝熱部材５０と加熱部材５６の基材５６ｂの接着面積が増えるため、伝熱部材５０と加熱部材５６をより強固に接着できるようになる。また面取りを施すことで、丸穴のバリを除去することができ、バリによる浮きを防止して良好な密着状態を確保することができる。   As shown to Fig.8 (a), it is preferable when the one side or both sides of the round hole 70 have the chamfering part 72 of C0.3 mm or more. Here, “C” indicates that the chamfer angle is 45 °, and “C 0.3 mm” indicates that a side of 0.3 mm is cut off from each surface. By chamfering, the bonding area between the heat transfer member 50 and the base member 56b of the heating member 56 increases, so that the heat transfer member 50 and the heating member 56 can be bonded more firmly. Moreover, by chamfering, the burr | flash of a round hole can be removed, the float by a burr | flash can be prevented and a favorable contact state can be ensured.

４ 給紙手段
６ レジストローラ対
８ 感光体ドラム
１０ 転写手段
１２ 定着装置
１４ 給紙トレイ
１６ 給紙コロ
１８ 帯電ローラ
２０ ミラー
２２ 現像手段
２２ａ 現像ローラ
２４ クリーニング手段
２４ａ クリーニングブレード
２６ 露光部
２８ 定着ベルト（定着部材）
３０ 加圧ローラ（加圧部材）
３０ａ 芯金
３０ｂ 弾性層
３４ 第１サーミスタ
３６ 第２サーミスタ
４０ 電源
４２ 加熱制御手段
５０ 伝熱部材
５６ 加熱部材
５６ａ 抵抗発熱体
５６ｂ 基材
５６ｃ オーバーコート層
５７ 支持部材
６０ 加熱手段
６１ ステー
Ｐ 用紙（記録材）
ＳＮ 定着ニップ部 4 Feeding means 6 Registration roller pair 8 Photosensitive drum 10 Transfer means 12 Fixing device 14 Feeding tray 16 Feeding roller 18 Charging roller 20 Mirror 22 Developing means 22a Developing roller 24 Cleaning means 24a Cleaning blade 26 Exposure unit 28 Fixing belt ( Fixing member)
30 Pressure roller (Pressure member)
30a Core 30b Elastic layer 34 First thermistor 36 Second thermistor 40 Power supply 42 Heating control means 50 Heat transfer member 56 Heating member 56a Resistance heating element 56b Base material 56c Overcoat layer 57 Support member 60 Heating means 61 Stay P Paper (Recording) Material)
SN fixing nip

特許３４７８６９７Patent 3,478,697

Claims (7)

未定着画像に接して回転する定着部材と、
前記定着部材との間で定着ニップ部を形成する加圧部材と、
記録材搬送方向と直交する方向に伸びて前記定着部材の内周面に接触して熱伝達する加熱部材と、
前記加熱部材と接して前記加熱部材の熱を均一に伝達する伝熱部材と、
前記加熱部材と接していない前記伝熱部材の面から前記加熱部材と前記伝熱部材を支持する支持部材と、を備え、
前記定着ニップ部に未定着画像を担持した記録材を通して画像定着を行う定着装置において、
前記加熱部材は、基材と、前記基材上に形成された抵抗発熱体と、を有し、
前記支持部材は、記録材搬送方向に所要の支持間隔を有して前記伝熱部材の表面領域に接し、
前記支持部材と接触していない前記伝熱部材の表面領域が、前記基材の表面領域と接し、
前記伝熱部材が前記加熱部材と接する面積は前記基材の表面領域と同一である、ことを特徴とする定着装置。 A fixing member that rotates in contact with an unfixed image;
A pressure member that forms a fixing nip with the fixing member;
A heating member that extends in a direction perpendicular to the recording material conveyance direction and contacts the inner peripheral surface of the fixing member to transfer heat;
A heat transfer member that contacts the heating member and uniformly transfers heat of the heating member;
A support member that supports the heating member and the heat transfer member from the surface of the heat transfer member that is not in contact with the heating member;
In a fixing device that performs image fixing through a recording material carrying an unfixed image in the fixing nip portion,
The heating member has a base material and a resistance heating element formed on the base material,
The support member is in contact with the surface region of the heat transfer member with a required support interval in the recording material conveyance direction,
The surface area of the heat transfer member not in contact with the support member is in contact with the surface area of the substrate;
The fixing device according to claim 1, wherein an area where the heat transfer member is in contact with the heating member is the same as a surface area of the base material. 前記伝熱部材と前記加熱部材が貼付により一体形成されている、ことを特徴とする請求項１に記載の定着装置。   The fixing device according to claim 1, wherein the heat transfer member and the heating member are integrally formed by sticking. 前記伝熱部材は接着剤を充填するための複数の開口部を長手方向に有し、前記開口部以外の領域に前記接着剤を付着させずに前記伝熱部材と前記加熱部材が前記接着剤で一体に貼付されている、ことを特徴とする請求項１又は２に記載の定着装置。   The heat transfer member has a plurality of openings in the longitudinal direction for filling the adhesive, and the heat transfer member and the heating member are bonded to the adhesive without attaching the adhesive to a region other than the openings. The fixing device according to claim 1, wherein the fixing device is integrally attached. 前記接着剤は、前記伝熱部材と前記加熱部材の前記基材との間における、線膨張係数の差により生じる２５０℃での長手方向の膨張長さの差分よりも大きく剪断方向に変形可能な耐熱接着剤である、ことを特徴とする請求項３に記載の定着装置。   The adhesive can be deformed in the shear direction to be larger than a difference in expansion length in the longitudinal direction at 250 ° C. caused by a difference in linear expansion coefficient between the heat transfer member and the base material of the heating member. The fixing device according to claim 3, wherein the fixing device is a heat-resistant adhesive. 前記開口部の片側又は両側はＣ０．３ｍｍ以上の面取り部を有する、ことを特徴とする請求項３又は４に記載の定着装置。   5. The fixing device according to claim 3, wherein one side or both sides of the opening has a chamfered portion of C 0.3 mm or more. 前記加熱部材の前記基材がガラスで構成されている、ことを特徴とする請求項１乃至５のいずれか一項に記載の定着装置。   The fixing device according to claim 1, wherein the base member of the heating member is made of glass. 請求項１乃至６のいずれか一項に記載の定着装置を備えることを特徴とする画像形成装置。
An image forming apparatus comprising the fixing device according to claim 1.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11599048B2 (en) 2020-12-04 2023-03-07 Brother Kogyo Kabushiki Kaisha Fixing device for fixing toner to sheet

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JPH1184919A (en) * 1997-09-11 1999-03-30 Canon Inc Heating device and image forming device
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JP2015111243A (en) * 2013-11-07 2015-06-18 株式会社リコー Fixing apparatus and image forming apparatus
JP2015118365A (en) * 2013-11-18 2015-06-25 キヤノン株式会社 Image heating device and image formation device mounted with image heating device
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JPH09226168A (en) * 1996-02-22 1997-09-02 Canon Inc Manufacture of optical print head, optical print head and image recording device using it
JPH10247025A (en) * 1997-03-04 1998-09-14 Sumitomo Electric Ind Ltd Ceramic heater and thermal fixing device
JPH1184919A (en) * 1997-09-11 1999-03-30 Canon Inc Heating device and image forming device
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Publication number Priority date Publication date Assignee Title
US11599048B2 (en) 2020-12-04 2023-03-07 Brother Kogyo Kabushiki Kaisha Fixing device for fixing toner to sheet

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