JP2001126856A - Induction heating unit and image forming unit - Google Patents
Induction heating unit and image forming unitInfo
- Publication number
- JP2001126856A JP2001126856A JP30386199A JP30386199A JP2001126856A JP 2001126856 A JP2001126856 A JP 2001126856A JP 30386199 A JP30386199 A JP 30386199A JP 30386199 A JP30386199 A JP 30386199A JP 2001126856 A JP2001126856 A JP 2001126856A
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- Japan
- Prior art keywords
- heating
- temperature
- induction heating
- image
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Fixing For Electrophotography (AREA)
- General Induction Heating (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電磁誘導加熱方式
の誘導加熱装置、及び該誘導加熱装置を像加熱手段とし
て備えた電子写真式の複写機、プリンタおよびファクシ
ミリなどの画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating apparatus of an electromagnetic induction heating type and an image forming apparatus such as an electrophotographic copying machine, a printer and a facsimile provided with the induction heating apparatus as an image heating means.
【０００２】[0002]
【従来の技術】電子写真式の複写機などには、記録紙な
いし転写材などのシート（記録媒体）上に転写されたト
ナー像を該シートに定着させる定着装置が設けられてい
る。この定着装置は、例えば、シート上のトナーを熱溶
融させる加熱ローラとも称される定着ローラと、当該定
着ローラに圧接してシートを挟持する加圧ローラとを有
している。定着ローラは中空状に形成され、この定着ロ
ーラの中心軸上には、発熱体が保持手段により保持され
ている。2. Description of the Related Art An electrophotographic copying machine or the like is provided with a fixing device for fixing a toner image transferred onto a sheet (recording medium) such as recording paper or a transfer material onto the sheet. This fixing device includes, for example, a fixing roller also called a heating roller that thermally melts toner on a sheet, and a pressure roller that presses against the fixing roller to sandwich the sheet. The fixing roller is formed in a hollow shape, and a heating element is held on a central axis of the fixing roller by holding means.
【０００３】発熱体は、例えば、ハロゲンランプなどの
管状発熱ヒータより構成され、所定の電圧が印加される
ことにより発熱するものである。[0003] The heating element is composed of, for example, a tubular heating heater such as a halogen lamp, and generates heat when a predetermined voltage is applied.
【０００４】このハロゲンランプは定着ローラの中心軸
に位置しているため、ハロゲンランプから発せられた熱
は定着ローラ内壁に均一に輻射され、定着ローラの外壁
の温度分布は円周方向において均一となる。定着ローラ
の外壁は、その温度が定着に適した温度（例えば、１５
０〜２００℃）になるまで加熱される。この状態で定着
ローラと加圧ローラは圧接しながら互いに逆方向へ回転
し、トナーが付着したシートを挟持する。定着ローラと
加圧ローラとの圧接部（以下、ニップ部ともいう）にお
いて、シート上のトナーは定着ローラの熱により溶解
し、両ローラから作用する圧力によりシートに定着され
る。Since this halogen lamp is located at the center axis of the fixing roller, heat generated from the halogen lamp is uniformly radiated to the inner wall of the fixing roller, and the temperature distribution of the outer wall of the fixing roller is uniform in the circumferential direction. Become. The outer wall of the fixing roller has a temperature suitable for fixing (for example, 15 ° C.).
(0-200 ° C.). In this state, the fixing roller and the pressure roller rotate in opposite directions while being pressed against each other, and pinch the sheet to which the toner has adhered. At a pressure contact portion (hereinafter also referred to as a nip portion) between the fixing roller and the pressure roller, the toner on the sheet is melted by the heat of the fixing roller, and is fixed to the sheet by the pressure applied from both rollers.
【０００５】しかし、ハロゲンランプなどから構成され
る発熱体を備えた上記定着装置においては、ハロゲンラ
ンプからの輻射熱を利用して定着ローラを加熱するた
め、電源を投入した後、定着ローラの温度が定着に適し
た所定温度に達するまでの時間（以下、「ウォームアッ
プタイム」という）に、比較的長時間を要していた。そ
の間、使用者は複写機を使用することができず、長時間
の待機を強いられるという問題があった。However, in the above-described fixing device having a heating element composed of a halogen lamp or the like, since the fixing roller is heated by using the radiant heat from the halogen lamp, the temperature of the fixing roller is reduced after the power is turned on. It takes a relatively long time to reach a predetermined temperature suitable for fixing (hereinafter referred to as "warm-up time"). During that time, the user cannot use the copier, and there is a problem that the user has to wait for a long time.
【０００６】その一方、ウォームアップタイムの短縮を
図ってユーザの操作性を向上すべく多量の電力を定着ロ
ーラに印加したのでは、定着装置における消費電力が増
大し、省エネルギー化に反するという問題が生じてい
た。このため、複写機などの商品の価値を高めるために
は、定着装置の省エネルギー化（低消費電力化）と、ユ
ーザの操作性向上（クイックプリント・ウォームアップ
タイムの短縮）との両立を図ることが一層注目され重視
されてきている。On the other hand, if a large amount of power is applied to the fixing roller in order to shorten the warm-up time and improve the operability of the user, the power consumption of the fixing device increases, which is contrary to energy saving. Had occurred. Therefore, in order to enhance the value of products such as copiers, it is necessary to achieve both energy saving (low power consumption) of the fixing device and improvement of user operability (shortening of quick print and warm-up time). Is gaining more and more attention.
【０００７】かかる要請に応える装置として、特開昭５
９−３３７８７号公報に示されるように、加熱源として
高周波誘導を利用した誘導加熱方式の定着装置が提案さ
れている。[0007] As an apparatus that meets such a demand, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent Application Laid-Open No. 9-33787, an induction heating type fixing device using high frequency induction as a heating source has been proposed.
【０００８】この誘導加熱定着装置は、金属導体からな
る中空の定着ローラの内部にコイルが同心状に配置され
ており、このコイルに高周波電流を流して生じた高周波
磁界により定着ローラに誘導電流（渦電流）を発生さ
せ、定着ローラ自体の表皮抵抗によって定着ローラその
ものをジュール発熱させるようになっている。この誘導
加熱方式の定着装置によれば、電気−熱変換効率がきわ
めて向上するため、ウォームアップタイムの短縮化が可
能となる。In this induction heating fixing device, a coil is concentrically arranged inside a hollow fixing roller made of a metal conductor, and a high-frequency magnetic field generated by flowing a high-frequency current through this coil causes an induction current ( An eddy current is generated, and the fixing roller itself generates Joule heat by the skin resistance of the fixing roller itself. According to the fixing device of the induction heating system, the electric-heat conversion efficiency is extremely improved, so that the warm-up time can be reduced.
【０００９】このような誘導加熱方式の定着装置にあっ
ては、定着ローラ自体の表皮抵抗によって発熱させるし
くみとなっており、定着ローラ自体の厚みが厚くても、
発熱量は変わらない。このため定着ローラの芯金が厚い
場合はかえって発熱効率が低下してしまい、ウォームア
ップタイム短縮の効果を得ることが困難になるので、通
常用いる強磁性体である鉄やニッケル等からなる芯金を
用いる場合はその厚みを１００〜１０００μｍぐらいと
して用いている。In such an induction heating type fixing device, heat is generated by the skin resistance of the fixing roller itself, and even if the fixing roller itself is thick,
The calorific value does not change. For this reason, when the core of the fixing roller is thick, the heat generation efficiency is rather reduced, and it is difficult to obtain the effect of shortening the warm-up time. Is used with a thickness of about 100 to 1000 μm.
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、上述し
た従来の誘導加熱方式の定着装置においては、定着ロー
ラの芯金として熱伝導性が低い鉄やニッケルといった金
属を用いるため以下のような問題点があった。However, in the above-mentioned conventional induction heating type fixing device, the following problems are caused because a metal such as iron or nickel having low thermal conductivity is used as the core metal of the fixing roller. there were.
【００１１】１）コア−コイルユニット近傍部分のみの
発熱であるために、特に立ち上がり時には周方向で温度
むら（被加熱体搬送方向に対する温度むら）が発生し、
このために画像では光沢ムラが発生していた。このため
に立ち上がり時に周方向温度均一化のために前回転を必
要とし、立ち上がり時間が余計にかかっていた。1) Since heat is generated only in the vicinity of the core-coil unit, temperature unevenness occurs in the circumferential direction (temperature unevenness in the direction of transport of the object to be heated), especially at the time of startup.
As a result, gloss unevenness occurred in the image. For this reason, a pre-rotation is required at the time of rising in order to equalize the temperature in the circumferential direction, and the rising time is longer.
【００１２】２）厚みが薄いため、熱のローラ軸方向へ
の伝達がされにくい。このため、例えば定着ローラの長
さよりも短いサイズのシートを通紙した場合、定着ロー
ラ上の通紙された部分と通紙されない部分が生じ、通紙
されない部分（非通紙部）は通紙されている部分よりも
高い温度になる。（以下非通紙部昇温と称す）この場
合、例えば小サイズのシートを通紙した直後に通常サイ
ズのシートを通紙すると、シート上にホットオフセット
が発生しやすくなる。また非通紙部昇温により、コア−
コイルがキュリー点温度を超えるようになると、誘導渦
電流は発生しなくなり、加熱装置の正常な発熱が妨げら
れてしまう。この場合、コアーコイルの温度が下がるま
で定着動作が休止することになる。2) Since the thickness is small, it is difficult for heat to be transmitted in the axial direction of the roller. Therefore, for example, when a sheet having a size smaller than the length of the fixing roller is passed, a portion of the fixing roller where a sheet is passed and a portion where the sheet is not passed are generated. Temperature will be higher than the part that is. In this case, for example, if a normal-size sheet is passed immediately after a small-size sheet is passed, hot offset easily occurs on the sheet. In addition, by increasing the temperature of the non-paper passing area, the core
When the temperature of the coil exceeds the Curie point, no induced eddy current is generated and normal heating of the heating device is hindered. In this case, the fixing operation stops until the temperature of the core coil decreases.
【００１３】本発明は、このような従来技術の問題点に
鑑みてなされたものであり、加熱部材の被加熱体搬送方
向に対する温度むらや、非通紙部昇温を防止することが
可能な誘導加熱装置、及び該誘導加熱装置を備えたこと
により、部分的な光沢ムラや高温オフセットの防止や、
連続して画像形成を行なうこと、立ち上がり時間の短縮
化が可能な画像形成装置の提供を目的としている。The present invention has been made in view of such problems of the prior art, and is capable of preventing the temperature unevenness of the heating member in the conveying direction of the object to be heated and the temperature rise of the non-sheet passing portion. By providing an induction heating device, and the induction heating device, to prevent partial gloss unevenness and high-temperature offset,
It is an object of the present invention to provide an image forming apparatus capable of continuously forming an image and shortening a rise time.
【００１４】[0014]
【課題を解決するための手段】本発明の誘導加熱装置及
び画像形成装置は、上記課題を解決するために以下の構
成を特徴とするものである。Means for Solving the Problems An induction heating apparatus and an image forming apparatus according to the present invention have the following features in order to solve the above-mentioned problems.
【００１５】〔１〕：誘導電流により発熱する加熱部材
と、当該加熱部材に対し圧接して配置される加圧部材
と、当該加熱部材に供給する磁束を発生させる誘導コイ
ルと、を有し、当該加熱部材と加圧部材とのニップ部に
通した被加熱材を該加熱部材からの熱で加熱する誘導加
熱装置において、当該加熱部材もしくは当該加圧部材の
少なくとも一方に圧接して配置される熱均一化部材を有
したことを特徴とする誘導加熱装置。[1]: a heating member that generates heat by an induced current, a pressing member that is disposed in pressure contact with the heating member, and an induction coil that generates a magnetic flux to be supplied to the heating member; In an induction heating device for heating a material to be heated passed through a nip portion between the heating member and the pressing member by heat from the heating member, the induction heating device is disposed in pressure contact with at least one of the heating member and the pressing member. An induction heating device comprising a heat equalizing member.
【００１６】〔２〕：前記熱均一化部材の少なくとも一
部は、加熱部材よりも熱伝導率が高いことを特徴とする
〔１〕に記載の誘導加熱装置。[2] The induction heating apparatus according to [1], wherein at least a part of the heat equalizing member has a higher thermal conductivity than a heating member.
【００１７】〔３〕：前記熱均一化部材の少なくとも一
部は、１Ｗ・ｍ-1Ｋ-1以上５００Ｗ・ｍ-1Ｋ-1以下の熱
伝導率を有する材料から構成されることを特徴とする
〔１〕又は〔２〕に記載の誘導加熱装置。[0017] [3]: At least a portion of the heat equalizing member, characterized in that they are composed of a material having a 1W · m -1 K -1 or 500W · m -1 K -1 or less of thermal conductivity The induction heating device according to [1] or [2].
【００１８】〔４〕：前記熱均一化部材の少なくとも一
部は、少なくともアルミニウム、銅または黄銅によって
構成されることを特徴とする〔１〕，〔２〕又は〔３〕
に記載の誘導加熱装置。[4] At least a part of the heat equalizing member is made of at least aluminum, copper or brass, [1], [2] or [3].
2. The induction heating device according to claim 1.
【００１９】〔５〕：前記加熱部材が、金属導体からな
る中空のローラ、或は導電性層を有したフィルム状部材
であることを特徴とする〔１〕〜〔４〕のいずれか１項
に記載の誘導加熱装置。[5] The method according to any one of [1] to [4], wherein the heating member is a hollow roller made of a metal conductor or a film-like member having a conductive layer. 2. The induction heating device according to claim 1.
【００２０】〔６〕：前記熱均一化部材は、当該加圧部
材に圧接し、当該加圧部材と共に回転することを特徴と
する〔１〕〜〔５〕のいずれか１項に記載の誘導加熱装
置。[6] The guide according to any one of [1] to [5], wherein the heat equalizing member is pressed against the pressing member and rotates together with the pressing member. Heating equipment.
【００２１】〔７〕：前記熱均一化部材は、当該加熱部
材に圧接し、当該加熱部材と共に回転することを特徴と
する〔１〕〜〔６〕のいずれか１項に記載の誘導加熱装
置。[7] The induction heating apparatus according to any one of [1] to [6], wherein the heat equalizing member is pressed against the heating member and rotates together with the heating member. .
【００２２】〔８〕：前記熱均一化部材は、ローラ状で
あることを特徴とする〔１〕〜〔７〕のいずれか１項に
記載の誘導加熱装置。[8] The induction heating apparatus according to any one of [1] to [7], wherein the heat equalizing member has a roller shape.
【００２３】[0023]
〔９〕：前記熱均一化部材は、中空パイプ
状であることを特徴とする〔１〕〜〔８〕のいずれか１
項に記載の誘導加熱装置。[9]: Any one of [1] to [8], wherein the heat equalizing member has a hollow pipe shape.
An induction heating device according to the item.
【００２４】〔１０〕：未定着トナー像を担持した被記
録材を加熱し、該未定着トナー像を被記録材に定着させ
ることを特徴とする〔１〕〜[10]: The recording material carrying the unfixed toner image is heated to fix the unfixed toner image on the recording material.
〔９〕のいずれか１項に記
載の誘導加熱装置。The induction heating device according to any one of [9].
【００２５】〔１１〕：前記ニップ部の非通紙部の温度
を検知する温度検知手段を有し、該検知温度が所定値以
上であった場合には、所定値未満の場合と比べ、被加熱
材の搬送速度を遅くすること或は被加熱材の搬送間隔を
広げることを特徴とする〔１〕〜〔１０〕のいずれか１
項に記載の誘導加熱装置。[11]: There is provided a temperature detecting means for detecting the temperature of the non-sheet passing portion of the nip portion. When the detected temperature is equal to or higher than a predetermined value, the detected temperature is lower than when the detected temperature is lower than the predetermined value. Any one of [1] to [10], wherein the conveying speed of the heating material is reduced or the conveying interval of the heating material is widened.
An induction heating device according to the item.
【００２６】〔１２〕：被記録材上に画像を形成する像
形成手段と、該画像を加熱処理する像加熱手段とを有
し、該加熱手段として〔１〕〜〔１１〕のいずれか１項
に記載の誘導加熱装置を備えたことを特徴とする画像形
成装置。[12]: An image forming means for forming an image on a recording material, and an image heating means for heating the image, wherein the heating means is any one of [1] to [11]. An image forming apparatus comprising the induction heating device according to any one of the preceding items.
【００２７】〔１３〕：被記録材上に画像を形成する像
形成手投と、基準温度を維持するように通電制御され該
画像を加熱処理する像加熱手段と、当該像加熱手段の温
度を検知する温度検知素子と、該記録材の搬送間隔を制
御する手段または該記録材の搬送速度を制御する手段の
少なくとも一つ、を有し、上記制御手段が、上記温度検
知素子の検知温度とあらかじめ決定してあった所定温度
との差分の大きさに基づき記録材の搬送間隔または記録
材の搬送速度の少なくとも一つを制御する画像形成装置
において、該像加熱手段として〔１〕〜〔１０〕のいず
れか１項に記載の誘導加熱装置を備えたことを特徴とす
る画像形成装置。[13]: An image forming method for forming an image on a recording material, an image heating means which is energized so as to maintain a reference temperature and heat-processes the image, and a temperature of the image heating means. A temperature detecting element for detecting, and at least one of a unit for controlling a conveying interval of the recording material or a unit for controlling a conveying speed of the recording material, wherein the control unit detects a detected temperature of the temperature detecting element and In an image forming apparatus that controls at least one of a recording material conveyance interval and a recording material conveyance speed based on a magnitude of a difference from a predetermined temperature that is determined in advance, the image heating unit includes [1] to [10]. An image forming apparatus comprising the induction heating device according to any one of the above items.
【００２８】（作用）〔１〕又は〔２〕の構成によれ
ば、加熱部材が局所的に昇温した場合であっても熱均一
化部材を介して熱が移動し、平均化されるので、該加熱
部材の温度ムラが防止でき、例えば小サイズシートを通
紙した場合に生じる加圧部材の非通紙部昇温を熱均一化
部材により、防止することができる。(Function) According to the constitution of [1] or [2], even if the temperature of the heating member rises locally, the heat moves through the heat equalizing member and is averaged. In addition, the temperature unevenness of the heating member can be prevented, and for example, the temperature increase of the non-sheet passing portion of the pressing member caused when the small size sheet is passed can be prevented by the heat equalizing member.
【００２９】〔３〕の構成によれば、熱均一化部材の熱
伝導率が大きいため、より速やかに非通紙部昇温を回避
できる。According to the configuration [3], since the heat uniformity of the heat equalizing member is high, the temperature rise of the non-sheet passing portion can be avoided more quickly.
【００３０】〔４〕の構成によれば、比較的安価な金属
で上記効果を得ることができるため、装置全体の低コス
ト化が実現される。According to the configuration [4], the above effect can be obtained with a relatively inexpensive metal, so that the cost of the entire apparatus can be reduced.
【００３１】〔５〕の構成によれば、加熱部材の熱容量
が小さくしてウォームアップタイムの短縮化を図ると共
に、熱容量を小さくした加熱部材の温度むらを防止して
いる。According to the configuration [5], the heat capacity of the heating member is reduced to shorten the warm-up time, and the uneven temperature of the heating member having the reduced heat capacity is prevented.
【００３２】〔６〕，〔７〕又は〔８〕の構成によれ
ば、熱均一化部材の回転により、より効果的に上記効果
が得られる。According to the constitution [6], [7] or [8], the above effect can be obtained more effectively by rotating the heat equalizing member.
【００３３】[0033]
〔９〕の構成によれば、熱均一化部材の熱
容量が小さくなるため、より効果的に上記効果が得られ
る。According to the configuration [9], the heat capacity of the heat equalizing member is reduced, so that the above-described effect can be obtained more effectively.
【００３４】〔１０〕の構成によれば、画像の光沢むら
や、ホットオフセットなどを防止し、良好な定着処理が
可能な誘導加熱装置が得られる。According to the configuration [10], an induction heating device capable of preventing unevenness in gloss of an image, hot offset, and the like and performing a good fixing process can be obtained.
【００３５】〔１１〕の構成によれば、被加熱材の搬送
速度或は被加熱材の搬送間隔の制御と、熱均一化部材に
よる加熱部材の熱の均一化とを併用することにより加熱
部材の温度ムラや非通紙部昇温を効果的に防止した誘導
加熱装置が得られる。According to the configuration [11], the control of the conveying speed of the material to be heated or the conveying interval of the material to be heated and the uniformization of the heat of the heating member by the heat equalizing member are used in combination. Thus, an induction heating device can be obtained in which the temperature unevenness and the temperature rise in the non-sheet passing portion are effectively prevented.
【００３６】〔１２〕の構成によれば、周方向温度ムラ
による光沢ムラ、非通紙部昇温によるホットオフセット
の発生や発熱停止等を起こさずに、小サイズ紙の連続通
紙が行え、ウエイトタイムの短い画像形成装置が提供さ
れる。According to the configuration [12], small-size paper can be continuously passed without causing uneven gloss due to temperature unevenness in the circumferential direction, occurrence of hot offset due to temperature rise of the non-sheet passing portion, and stop of heat generation. An image forming apparatus having a short wait time is provided.
【００３７】〔１３〕の構成によれば、被加熱材の搬送
速度或は被加熱材の搬送間隔の制御と、熱均一化部材に
よる加熱部材の熱の均一化とを併用することにより加熱
部材の温度ムラや非通紙部昇温を効果的に防止した画像
形成装置が得られる。According to the configuration [13], the control of the conveying speed of the material to be heated or the conveying interval of the material to be heated and the uniformization of the heat of the heating member by the heat equalizing member are used in combination. Thus, an image forming apparatus can be obtained in which the temperature unevenness and the temperature rise of the non-sheet passing portion are effectively prevented.
【００３８】[0038]
【発明の実施の形態】（実施の形態１）以下、本発明の
実施の形態を図面に基づいて説明する。図１は、本発明
の実施の形態１に係る誘導加熱定着装置を概略で示す断
面図である。(Embodiment 1) Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view schematically showing an induction heating fixing device according to Embodiment 1 of the present invention.
【００３９】定着ローラ１は外径４０［ｍｍ］、厚さ
０．７［ｍｍ］、長さ３４０［ｍｍ］の鉄製の芯金シリ
ンダに表面の離型性を高めるために、通紙域である中央
部の３２０［ｍｍ］の領域に例えばＰＴＦＥ１０〜５０
［μｍ］や、ＰＦＡ１０〜５０［μｍ］の層を設けてい
る。The fixing roller 1 has an outer diameter of 40 [mm], a thickness of 0.7 [mm], and a length of 340 [mm]. For example, PTFE10 to 50
[Μm] or a layer of PFA 10 to 50 [μm].
【００４０】加圧ローラ２は、中空芯金２ａと、その外
周面に形成される５ｍｍ厚の表面離型性耐熱ゴム層（面
長３２５［ｍｍ］）である弾性層２ｂとからなる。この
加圧ローラ２の両端には軸受部が形成され、図示しない
定着ユニットフレームに回転自在に取り付けられてい
る。The pressure roller 2 comprises a hollow cored bar 2a and an elastic layer 2b formed on the outer peripheral surface thereof, which is a surface-releasable heat-resistant rubber layer (surface length 325 [mm]) having a thickness of 5 mm. Bearing portions are formed at both ends of the pressure roller 2, and are rotatably attached to a fixing unit frame (not shown).
【００４１】定着ローラ１と加圧ローラ２は回転自在に
支持されていて、定着ローラ１のみを駆動する構成にな
っている。加圧ローラ２は定着ローラ１の表面に圧接し
ていて、圧接部（ニップ部）での摩擦力で従動回転する
様に配置してある。また加圧ローラ２は定着ローラ１の
回転軸方向にバネなどを用いた図示しない機構によって
加圧されている。The fixing roller 1 and the pressure roller 2 are rotatably supported, so that only the fixing roller 1 is driven. The pressure roller 2 is in pressure contact with the surface of the fixing roller 1 and is arranged so as to be driven to rotate by frictional force at a pressure contact portion (nip portion). The pressure roller 2 is pressed in the rotation axis direction of the fixing roller 1 by a mechanism (not shown) using a spring or the like.
【００４２】加圧ローラ２は、約３０［Ｋｇ重］で荷重
されており、その場合圧接部の幅（ニップ幅）は約６
［ｍｍ］になる。しかし都合によっては荷重を変化させ
てニップ幅を変えてもよい。The pressure roller 2 is loaded with a load of about 30 [kg weight]. In this case, the width (nip width) of the pressure contact portion is about 6 kg.
[Mm]. However, depending on circumstances, the nip width may be changed by changing the load.
【００４３】この定着ニップ部内での加熱原理を図２で
説明する。励磁回路１４によって励磁コイル３に印加さ
れる電流で発生する磁束は、高透磁率コア４に導かれて
定着ニップ部Ｎ内で定着ローラ１の芯金に磁束３３と渦
電流３４を発生させる。この渦電流３４と定着ローラ１
の固有抵抗によって熱が発生する。The principle of heating in the fixing nip will be described with reference to FIG. The magnetic flux generated by the current applied to the excitation coil 3 by the excitation circuit 14 is guided to the high magnetic permeability core 4 and generates a magnetic flux 33 and an eddy current 34 in the core of the fixing roller 1 in the fixing nip N. The eddy current 34 and the fixing roller 1
Heat is generated by the specific resistance of
【００４４】励磁コイル３はコア４に巻き付ける様にＰ
ＰＳ，ＰＥＥＫ，フェノール樹脂等の耐熱性樹脂からな
るホルダー５の内部に配設されている。この励磁コイル
３には１０〜１００［ｋＨｚ］の交流電流が印加され
る。交流電流によって誘導された磁界は導電層である定
着ローラ１の内面に渦電流を流し、ジュール熱を発生さ
せる。この発熱を増加させるためには励磁コイル３の巻
き数を増やしたり、コア４をフェライト、パーマロイと
いった高透磁率で残留磁速密度の低いものを用いたり、
交流電流の周波数を高くすると良い。The exciting coil 3 is wound around the core 4 by P
It is disposed inside a holder 5 made of a heat-resistant resin such as PS, PEEK, or phenol resin. An alternating current of 10 to 100 [kHz] is applied to the exciting coil 3. The magnetic field induced by the alternating current causes an eddy current to flow on the inner surface of the fixing roller 1 which is a conductive layer to generate Joule heat. In order to increase this heat generation, the number of turns of the exciting coil 3 is increased, or the core 4 is made of ferrite or permalloy having a high magnetic permeability and a low residual magnetic velocity density,
It is advisable to increase the frequency of the alternating current.
【００４５】サーミスタ６は定着ローラ１の表面の長手
方向中央部に当接するように配置され、温度センサー６
の検出信号をもとに励磁コイル３への電力供給を増減さ
せることで、定着ローラ１の表面温度が所定の一定温度
になる様自動制御される。The thermistor 6 is arranged so as to abut on the center of the surface of the fixing roller 1 in the longitudinal direction.
By increasing or decreasing the power supply to the excitation coil 3 based on the detection signal of the above, the surface temperature of the fixing roller 1 is automatically controlled so as to become a predetermined constant temperature.
【００４６】搬送ガイド７は、未定着のトナー画像８を
担持しながら搬送される転写材Ｐを定着ローラ１と加圧
ローラ２との圧接部（ニップ部）へ案内する位置に配置
される。The transport guide 7 is arranged at a position where the transfer material P transported while carrying the unfixed toner image 8 is guided to a pressure contact portion (nip portion) between the fixing roller 1 and the pressure roller 2.
【００４７】分離爪１０は、定着ローラ１の表面に当接
または近接して配置される。The separation claw 10 is disposed in contact with or close to the surface of the fixing roller 1.
【００４８】熱均一化部材９は加圧ローラ２に対して当
接従動する直径１２ｍｍのアルミニウムの中実棒状回転
体であり、長手方向（図１紙面表裏方向）寸法は、３２
０［ｍｍ］である。熱均一化ローラ９はばね２１によっ
て総圧２〜３０ｋｇの圧力で加圧ローラ２に当接し、ニ
ップを形成している。このニップ幅は２ｍｍ以上が好ま
しい。また、熱均一化ローラ９はピン２０を回転中心と
し、ベアリング２３を介して板金２２に支持されてお
り、加圧ローラ２の回転に伴なって従動回転する。The heat uniformizing member 9 is a solid rod-like rotating body of 12 mm in diameter which is driven to abut against the pressure roller 2 and has a longitudinal dimension (front and back direction in FIG. 1) of 32 mm.
0 [mm]. The heat equalizing roller 9 is in contact with the pressure roller 2 at a total pressure of 2 to 30 kg by a spring 21 to form a nip. The nip width is preferably 2 mm or more. The heat equalizing roller 9 is supported on a sheet metal 22 via a bearing 23 with a pin 20 as a center of rotation, and is driven to rotate with the rotation of the pressure roller 2.
【００４９】熱均一化ローラ９の材質にはアルミニウム
が用いられているが、これはアルミニウムが高熱伝導率
（２３３Ｗ・ｍ-1・Ｋ-1３００℃）を有しているためで
あり、例えば銅や黄銅も高熱伝導率を有しているため、
熱均一化部材として適している。非通紙部昇温によって
加圧ローラ２の軸方向の温度分布にむらが発生すると、
長手方向にわたった熱均一化ローラ９上を熱が伝達し、
加圧ローラ２上で温度が平均化される。Aluminum is used as the material of the heat uniformizing roller 9 because aluminum has a high thermal conductivity (233 W · m −1 · K −1 300 ° C.). Copper and brass also have high thermal conductivity,
Suitable as a heat equalizing member. When the temperature distribution in the axial direction of the pressure roller 2 becomes uneven due to the temperature rise in the non-sheet passing portion,
Heat is transmitted on the heat equalizing roller 9 extending in the longitudinal direction,
The temperature is averaged on the pressure roller 2.
【００５０】図３は、加圧ローラ２に熱均一化ローラ９
を当接させた場合（ａ）と当接させない場合（ｂ）の定
着ローラ表面の長手方向中心部（通紙部）と端部（非通
紙部）の温度差（非通紙部昇温：△Ｔ）を示したもので
ある。なお、通紙は１９０℃温調で、８０ｇ／ｍ2の坪
量を有するＡ４紙を縦（幅２１０ｍｍ）に３０枚／分の
通紙を行った。FIG. 3 shows that the heat equalizing roller 9 is
(A) and (b) the temperature difference between the center (paper passing portion) and the end (non-paper passing portion) of the fixing roller surface in the longitudinal direction. : ΔT). The paper was passed at a temperature of 190 ° C., and 30 sheets / minute of A4 paper having a basis weight of 80 g / m 2 were passed vertically (210 mm in width).
【００５１】図３によれば、（ａ）では３０枚通紙後か
ら、中央部と端部の温度差が生じはじめ、１００枚通紙
後には、温調温度に対して約５０℃の昇温になった。こ
れに対して、（ｂ）では１００枚以上通紙を行なっても
中央部と端部との差は最大でも５℃前後となり非通紙部
の昇温を発生させていない。According to FIG. 3, in FIG. 3A, a temperature difference between the central portion and the end portion starts to occur after 30 sheets have passed, and after 100 sheets have passed, the temperature rises by about 50 ° C. with respect to the temperature regulation temperature. It was warm. On the other hand, in (b), even when 100 or more sheets are passed, the difference between the central portion and the end portion is around 5 ° C. at the maximum, and the temperature rise in the non-sheet passing portion does not occur.
【００５２】このように、本形態によれば、小サイズ紙
通紙時に、定着ローラもしくは加圧ローラ、さらに非通
紙部側のコア−コイルの非通紙域での過昇温を抑えら
れ、高温オフセットの発生及び発熱停止による休止を防
止することができる。As described above, according to the present embodiment, when a small-size sheet is passed, an excessive temperature rise in the non-sheet passing area of the fixing roller or the pressure roller and the core-coil on the non-sheet passing portion side can be suppressed. In addition, it is possible to prevent the occurrence of a high-temperature offset and the suspension due to the stoppage of heat generation.
【００５３】また、立ち上げ時には加圧ローラ周方向の
温度ムラを防止する効果もあり、加圧ローラ温度ムラに
よる光沢ムラの発生を防止することができる。Also, at the time of startup, there is an effect of preventing temperature unevenness in the circumferential direction of the pressure roller, and it is possible to prevent the occurrence of gloss unevenness due to the temperature unevenness of the pressure roller.
【００５４】（実施の形態２）次に、本発明の他の実施
の形態を図４に基づいて説明する。図４は、本発明の実
施の形態２に係る誘導加熱定着装置を概略で示す拡大横
断面図である。なお、図中前記実施の形態と同一のもの
は同一番号を付して説明は省略する。(Embodiment 2) Next, another embodiment of the present invention will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view schematically showing an induction heating fixing device according to Embodiment 2 of the present invention. In the drawings, the same components as those of the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.
【００５５】図中中空の熱均一化ローラ１９は定着ロー
ラ１の軸と不図示の連接板によって連接されている。The hollow heat equalizing roller 19 in the figure is connected to the shaft of the fixing roller 1 by a connecting plate (not shown).
【００５６】連接板には不図示のベアリングがついてお
り、定着ローラ１の回転に伴なって熱均一化ローラ１９
は従動回転する。The connecting plate is provided with a bearing (not shown).
Is driven to rotate.
【００５７】次に熱均一化ローラ１９によって周方向の
温度ムラが解消する様子を説明する。立ち上げ直後に
は、定着ローラ１のコア４に対峙した部分が局所的に昇
温するが、やがて該ローラ１が駆動されて、局所的に高
温の部分が熱均一化ローラ１９に接触する。熱均一化ロ
ーラは定着ローラ１の熱を奪いながらともに回転し、あ
とからくる定着ローラ１の低温部分に熱を再供給する。
熱均一化ローラ１９は薄肉のアルミよりなり、また本例
のローラ中空内部は真空であるため、熱が逃げにくく、
効果的に熱の再供給がなされる。該装置と熱均一化ロー
ラのない装置とを比較検討したところ、低温からの立ち
上げ直後数枚に出ていた画像の光沢ムラが熱均一化ロー
ラ１９により解消されている。Next, how the temperature uniformity in the circumferential direction is eliminated by the heat equalizing roller 19 will be described. Immediately after startup, the portion of the fixing roller 1 facing the core 4 locally rises in temperature, but the roller 1 is eventually driven, and the locally high temperature portion contacts the heat equalizing roller 19. The heat equalizing roller rotates together with the heat of the fixing roller 1 while removing the heat of the fixing roller 1, and resupplies the heat to a low temperature portion of the fixing roller 1 that comes later.
The heat equalizing roller 19 is made of thin aluminum, and since the inside of the roller hollow of this example is a vacuum, heat hardly escapes.
Effective re-supply of heat is achieved. A comparison between the apparatus and the apparatus without the heat equalizing roller revealed that unevenness in gloss of an image appeared on several sheets immediately after startup from a low temperature was eliminated by the heat uniformizing roller 19.
【００５８】また、小サイズ（Ａ４、Ｂ５、Ｂ４サイ
ズ）の転写紙を通紙させた場合、小サイズ通紙領域と非
通紙領域とで、励磁コア４に温度差が生じる（実験デー
タではＡ４サイズ５０枚通紙で、４０〜５０℃）ことが
ある。When small-size (A4, B5, B4 size) transfer paper is passed, a temperature difference occurs in the exciting core 4 between the small-size paper passing area and the non-paper passing area (according to the experimental data). (50-50 ° C with 50 sheets of A4 size).
【００５９】そこで、図４の実施例では熱伝導率の大き
い熱均一化ローラ１９を定着ローラ１に当接させて、非
通紙部の領域の熱量の一部を放熱させるとともに、大部
分を小サイズ通紙領域に伝熱させることによって、非通
紙部領域の過昇温を抑えることができる。また、本実施
形態において熱均一化ローラ１９は、定着ローラ外面に
当接しているが、内面に接触させても構わない。Therefore, in the embodiment shown in FIG. 4, the heat equalizing roller 19 having a large thermal conductivity is brought into contact with the fixing roller 1 to dissipate a part of the amount of heat in the non-sheet passing area and to remove most of the heat. By transferring heat to the small-size paper passing area, it is possible to suppress excessive temperature rise in the non-paper passing area. Further, in the present embodiment, the heat equalizing roller 19 is in contact with the outer surface of the fixing roller, but may be in contact with the inner surface.
【００６０】（実施の形態３）次に、本発明の他の実施
の形態を図５に基づいて説明する。図５は、本発明の実
施の形態３に係る誘導加熱装置の長手方向を示す概略図
である。なお、図中実施の形態１と同一のものは同一番
号を付して説明は省略する。(Embodiment 3) Next, another embodiment of the present invention will be described with reference to FIG. FIG. 5 is a schematic diagram showing a longitudinal direction of the induction heating device according to Embodiment 3 of the present invention. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
【００６１】本形態では、温調用の第１サーミスタ１５
を定着ローラ１長手方向中央部に、また第２サーミスタ
１６を定着ローラ１の長手方向端部に配置している。第
２サーミスタの出力信号は検知回路１００で検知され
る。In this embodiment, the first thermistor 15 for temperature control is used.
At the longitudinal center of the fixing roller 1 and the second thermistor 16 at the longitudinal end of the fixing roller 1. The output signal of the second thermistor is detected by the detection circuit 100.
【００６２】小サイズ紙が通紙され、非通紙部昇温によ
って第２サーミスタ１６の温度がある温度以上であるこ
とを比較回路１０１によって確認されると、駆動制御回
路１０２に信号が送られ、駆動手段１０３の回転速度が
落ちて、搬送速度が遅くなる。これにより、非通紙部昇
温が小さくなる。When the small-sized paper is passed and the comparison circuit 101 confirms that the temperature of the second thermistor 16 is equal to or higher than a certain temperature by raising the temperature of the non-sheet passing portion, a signal is sent to the drive control circuit 102. Then, the rotation speed of the driving means 103 decreases, and the transport speed decreases. Thereby, the temperature rise in the non-sheet passing portion is reduced.
【００６３】本形態では、定着部でのシートの搬送速度
を２５０ｍｍ／ｓｅｃ（通紙枚数：５０枚／分）として
通紙を開始し、１００枚通紙後に第２サーミスタ１６で
の検知温度が２１０℃になった時点で、搬送速度を１５
０ｍｍ／ｓｅｃ（通紙枚数：３０枚／分）とする。その
後、第２サーミスタ１６での検知温度が１９５℃となっ
た時点で、搬送速度を再び２５０ｍｍ／ｓｅｃとする。
このように搬送速度を落とす方法と熱均一化部材との併
用により非通紙部昇温を効果的に防止することができ
る。In the present embodiment, the sheet feeding speed is set to 250 mm / sec (sheet passing number: 50 sheets / min) at the fixing unit, and the sheet feeding is started. After 100 sheets have passed, the temperature detected by the second thermistor 16 is reduced. When the temperature reaches 210 ° C, the transport speed is reduced to 15
0 mm / sec (sheet passing number: 30 sheets / min). Thereafter, when the temperature detected by the second thermistor 16 reaches 195 ° C., the transport speed is again set to 250 mm / sec.
As described above, the combined use of the method of lowering the transport speed and the heat equalizing member can effectively prevent the non-sheet passing portion from rising in temperature.
【００６４】また、本形態では熱均一化部材と併用して
搬送速度を落とす方法を用いたが、通紙間隔を広げて時
間当たりの給紙枚数を減らす方法でも同様の効果が得ら
れる。Further, in this embodiment, the method of lowering the transport speed is used in combination with the heat equalizing member. However, the same effect can be obtained by increasing the paper passing interval to reduce the number of sheets fed per hour.
【００６５】（その他）なお、上記の実施の形態では加
熱部材として定着ローラを用いているが、薄膜フィルム
を用いた構成とすることももちろん可能である。(Others) In the above embodiment, the fixing roller is used as the heating member. However, it is of course possible to adopt a configuration using a thin film.
【００６６】図６（ａ）は、フィルム状の加熱部材を用
いた例であり、励磁コイル３等を保持したホルダー５と
ガイド部材１７とに円筒状の薄膜フィルム１を外嵌し、
加圧ローラ２を回転駆動させてフィルム１を従動させて
いる。該フィルム１は、電磁誘導によって発熱するよう
に薄膜金属フィルムや、導電層を具備する多層構成のフ
ィルムを用いている。本例では、図６（ｂ）に示すよう
に、所要の剛性を有する基層１ａと、導電性で且つ強磁
性の導電層１ｂと、最外周に位置して記録材の離型性を
確保する離型層１ｃとを有している。FIG. 6A shows an example in which a film-shaped heating member is used. The cylindrical thin film 1 is externally fitted to the holder 5 holding the excitation coil 3 and the like and the guide member 17.
The pressure roller 2 is driven to rotate, and the film 1 is driven. As the film 1, a thin-film metal film or a multi-layer film having a conductive layer so as to generate heat by electromagnetic induction is used. In this example, as shown in FIG. 6B, the base layer 1a having a required rigidity, the conductive and ferromagnetic conductive layer 1b, and the outermost periphery are provided to secure the releasability of the recording material. And a release layer 1c.
【００６７】本例では、加圧ローラ２に熱均一化ローラ
９を圧接すると共に、フィルム１に熱均一化ローラ１９
を圧接して加熱部材（フィルム）１の周方向の温度むら
及び非通紙部昇温を防止している。なお、該熱均一化ロ
ーラ１９は、フィルム１に従動しても良いし、該フィル
ム１と同一の速度で回転駆動される構成でも良い。In this embodiment, the heat equalizing roller 9 is pressed against the pressure roller 2 and the heat uniform roller 19 is
To prevent uneven temperature in the circumferential direction of the heating member (film) 1 and increase in the temperature of the non-sheet passing portion. The heat equalizing roller 19 may be driven by the film 1 or may be driven to rotate at the same speed as the film 1.
【００６８】また、図７に示したように、駆動ローラ３
０と、テンションローラ３１、摺動部材３２の複数部材
間にフィルム１を捲回張設した構成であっても、同様の
効果が得られる。Further, as shown in FIG.
The same effect can be obtained even if the film 1 is wound and stretched between the tension roller 31 and the sliding member 32.
【００６９】（画像形成装置例）図８は画像形成装置の
一例の概略構成図である。本例の画像形成装置は電子写
真プロセス利用のレーザービームプリンターである。(Example of Image Forming Apparatus) FIG. 8 is a schematic structural view of an example of the image forming apparatus. The image forming apparatus of this embodiment is a laser beam printer using an electrophotographic process.
【００７０】４１は第１の像担持体としての回転ドラム
型の電子写真感光体（以下、感光ドラムと記す）であ
り、矢示の時計方向に所定の周速度（プロセススピー
ド）をもって回転駆動され、その回転過程で一次帯電器
４２によりマイナスの所定の暗電位ＶD に一様に帯電処
理される。Reference numeral 41 denotes a rotating drum type electrophotographic photosensitive member (hereinafter, referred to as a photosensitive drum) as a first image carrier, which is rotationally driven at a predetermined peripheral speed (process speed) clockwise as indicated by an arrow. , it is uniformly charged to a predetermined negative dark potential V D by a primary charger 42 in the rotation process.
【００７１】４３はレーザービームスキャナであり、不
図示の画像読取装置・ワードプロセッサ・コンピュータ
等のホスト装置から入力される目的の画像情報の時系列
電気デジタル画像信号に対応して変調されたレーザービ
ームＬを出力し、前記の回転感光ドラム４１の一様帯電
処理面を走査露光する。Reference numeral 43 denotes a laser beam scanner, which is a laser beam L modulated in accordance with a time-series electric digital image signal of target image information input from a host device such as an image reading device, a word processor, and a computer (not shown). Is output, and the uniformly charged surface of the rotating photosensitive drum 41 is scanned and exposed.
【００７２】このレーザービーム走査露光により、回転
感光ドラム４１の一様帯電処理面の露光部分は電位絶対
値が小さくなって明電位ＶL となり、回転感光ドラム４
１面に目的の画像情報に対応した静電潜像が形成されて
いく。次いでその潜像は現像器４４によりマイナスに帯
電した粉体トナーで反転現像（感光ドラム面のレーザー
露光明電位ＶL 部にトナーが付着）されてトナー画像と
して顕像化される。By this laser beam scanning exposure, the exposed portion of the uniformly charged surface of the rotating photosensitive drum 41 has a small absolute value of the potential and becomes a bright potential VL .
An electrostatic latent image corresponding to the target image information is formed on one surface. Next, the latent image is subjected to reversal development (toner is adhered to the laser exposure light potential VL portion on the surface of the photosensitive drum) with the negatively charged powder toner by the developing device 44 to be visualized as a toner image.
【００７３】一方、不図示の給紙トレイ上から給紙され
た記録材Ｐは、転写バイアスを印加した転写部材として
の転写ローラ４５と感光ドラム４１との圧接部（転写
部）へ感光ドラム４１の回転と同期どりされた適切なタ
イミングをもって給送され、該記録材Ｐの面に感光ドラ
ム４１面側のトナー画像８が順次に転写されていく。On the other hand, the recording material P fed from a paper feed tray (not shown) is transferred to a pressure contact portion (transfer portion) between a transfer roller 45 as a transfer member to which a transfer bias is applied and the photosensitive drum 41. The toner image 8 on the surface of the photosensitive drum 41 is sequentially transferred to the surface of the recording material P at an appropriate timing synchronized with the rotation of the recording material P.
【００７４】そして、これらの各要素４１，４２，４
３，４４，４５等で構成された像形成手段により未定着
トナー画像が形成された記録材Ｐは、回転感光ドラム４
１面から分離され、上記実施の形態に示した定着装置
（像加熱手段）Ｒに導入されてトナー画像８の定着処理
を受け、画像形成物（プリント）として機外へ排紙され
る。Then, each of these elements 41, 42, 4
The recording material P on which the unfixed toner image has been formed by the image forming means composed of
The sheet is separated from one surface, introduced into the fixing device (image heating unit) R described in the above-described embodiment, subjected to the fixing process of the toner image 8, and discharged out of the apparatus as an image formed product (print).
【００７５】なお、記録材分離後の回転感光ドラム４１
面はクリーニング装置４６で転写残りトナー等の感光ド
ラム面残留物の除去を受けて清浄面化されて繰り返して
作像に供される。The rotary photosensitive drum 41 after the recording material is separated
The surface is cleaned by the cleaning device 46 to remove the residual toner such as toner remaining after transfer, and the surface is repeatedly provided for image formation.
【００７６】[0076]
【発明の効果】以上説明したように、本発明によれば、
加熱部材の被加熱体搬送方向に対する温度むらや、非通
紙部昇温を防止することが可能な誘導加熱装置、及び該
誘導加熱装置を備えたことにより、部分的な光沢ムラや
高温オフセットの防止や、連続して画像形成を行なうこ
と、立ち上がり時間の短縮化が可能な画像形成装置を提
供することができる。As described above, according to the present invention,
The induction heating device capable of preventing the temperature unevenness of the heating member in the conveyance direction of the heated object and the temperature increase in the non-sheet passing portion, and the provision of the induction heating device, thereby causing partial gloss unevenness and high-temperature offset. It is possible to provide an image forming apparatus capable of preventing image formation, performing image formation continuously, and shortening the rise time.
【図１】 本発明の実施の形態１である誘導加熱装置の
拡大横断面図FIG. 1 is an enlarged cross-sectional view of an induction heating device according to a first embodiment of the present invention.
【図２】 磁気誘導加熱方式の原理を示した模式図FIG. 2 is a schematic diagram showing the principle of the magnetic induction heating method.
【図３】 本発明の実施の形態１の効果を示すグラフ
（通紙枚数と非通紙部昇温の関係）FIG. 3 is a graph showing the effect of the first embodiment of the present invention (relationship between the number of sheets passed and the temperature rise in a non-sheet passing portion).
【図４】 本発明の実施の形態２である誘導加熱装置の
拡大横断面図FIG. 4 is an enlarged cross-sectional view of an induction heating device according to a second embodiment of the present invention.
【図５】 本発明の実施の形態３である誘導加熱装置の
長手方向図FIG. 5 is a longitudinal view of an induction heating device according to a third embodiment of the present invention.
【図６】 誘導加熱装置のその他の構成を示す図FIG. 6 is a diagram showing another configuration of the induction heating device.
【図７】 誘導加熱装置のその他の構成を示す図FIG. 7 is a diagram showing another configuration of the induction heating device.
【図８】 画像形成装置の概略構成図FIG. 8 is a schematic configuration diagram of an image forming apparatus.
【符号の説明】 １ 加熱部材（フィルム，定着ローラ） ２ 加圧部材（加圧ローラ） ３ 励磁コイル ４ 高透磁率コア ５ ホルダー ６ サーミスタ ７ 搬送ガイド １４ 励磁回路 １５ 第１サーミスタ １６ 第２サーミスタ １７ ガイド部材 １９ 熱均一化ローラ（熱均一化部材） １００ 検知回路 １０１ 比較回路 １０２ 駆動制御回路 １０３ 駆動手段 Ｐ 記録材[Description of Signs] 1 Heating Member (Film, Fixing Roller) 2 Pressing Member (Pressing Roller) 3 Excitation Coil 4 High Permeability Core 5 Holder 6 Thermistor 7 Transport Guide 14 Excitation Circuit 15 First Thermistor 16 Second Thermistor 17 Guide member 19 Heat equalizing roller (heat equalizing member) 100 Detection circuit 101 Comparison circuit 102 Drive control circuit 103 Driving means P Recording material
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H033 BA11 BA29 BA32 BB01 BB30 BB33 BE03 BE06 CA07 CA36 CA37 3K059 AB00 AB19 AB20 AB22 AB23 AB28 AC10 AC33 AC37 AC73 AD05 AD07 AD15 AD26 AD34 CD44 CD52 CD66 CD75 CD77 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H033 BA11 BA29 BA32 BB01 BB30 BB33 BE03 BE06 CA07 CA36 CA37 3K059 AB00 AB19 AB20 AB22 AB23 AB28 AC10 AC33 AC37 AC73 AD05 AD07 AD15 AD26 AD34 CD44 CD52 CD66 CD75 CD77
Claims (13)
と、を有し、 当該加熱部材と加圧部材とのニップ部に通した被加熱材
を該加熱部材からの熱で加熱する誘導加熱装置におい
て、 当該加熱部材もしくは当該加圧部材の少なくとも一方に
圧接して配置される熱均一化部材を有したことを特徴と
する誘導加熱装置。A heating member configured to generate heat by an induced current; a pressure member disposed in pressure contact with the heating member; and an induction coil configured to generate a magnetic flux to be supplied to the heating member. In an induction heating device for heating a material to be heated passed through a nip portion between a member and a pressing member by heat from the heating member, a heat uniform disposed in pressure contact with at least one of the heating member and the pressing member. An induction heating device characterized by having a forming member.
加熱部材よりも熱伝導率が高いことを特徴とする請求項
１に記載の誘導加熱装置。2. At least a part of the heat equalizing member,
The induction heating device according to claim 1, wherein the heat conductivity is higher than that of the heating member.
１Ｗ・ｍ-1Ｋ-1以上５００Ｗ・ｍ-1Ｋ-1以下の熱伝導率
を有する材料から構成されることを特徴とする請求項１
又は２に記載の誘導加熱装置。3. At least a part of the heat equalizing member,
Claim, characterized in that it is composed of a material having a 1W · m -1 K -1 or 500W · m -1 K -1 or less of thermal conductivity 1
Or the induction heating device according to 2.
少なくともアルミニウム、銅または黄銅によって構成さ
れることを特徴とする請求項１，２又は３に記載の誘導
加熱装置。4. At least a part of the heat equalizing member,
4. The induction heating device according to claim 1, wherein the induction heating device is made of at least aluminum, copper, or brass.
のローラ、或は導電性層を有したフィルム状部材である
ことを特徴とする請求項１〜４のいずれか１項に記載の
誘導加熱装置。5. The induction according to claim 1, wherein the heating member is a hollow roller made of a metal conductor or a film-shaped member having a conductive layer. Heating equipment.
接し、当該加圧部材と共に回転することを特徴とする請
求項１〜５のいずれか１項に記載の誘導加熱装置。6. The induction heating apparatus according to claim 1, wherein the heat equalizing member is pressed against the pressing member and rotates together with the pressing member.
接し、当該加熱部材と共に回転することを特徴とする請
求項１〜６のいずれか１項に記載の誘導加熱装置。7. The induction heating apparatus according to claim 1, wherein the heat equalizing member is pressed against the heating member and rotates together with the heating member.
とを特徴とする請求項１〜７のいずれか１項に記載の誘
導加熱装置。8. The induction heating apparatus according to claim 1, wherein the heat equalizing member has a roller shape.
ることを特徴とする請求項１〜８のいずれか１項に記載
の誘導加熱装置。9. The induction heating apparatus according to claim 1, wherein the heat equalizing member has a hollow pipe shape.
加熱し、該未定着トナー像を被記録材に定着させること
を特徴とする請求項１〜９のいずれか１項に記載の誘導
加熱装置。10. The guide according to claim 1, wherein the recording material carrying the unfixed toner image is heated to fix the unfixed toner image on the recording material. Heating equipment.
する温度検知手段を有し、該検知温度が所定値以上であ
った場合には、所定値未満の場合と比べ、被加熱材の搬
送速度を遅くすること或は被加熱材の搬送間隔を広げる
ことを特徴とする請求項１〜１０のいずれか１項に記載
の誘導加熱装置。11. A temperature detecting means for detecting a temperature of a non-sheet passing portion of the nip portion, wherein when the detected temperature is equal to or higher than a predetermined value, the temperature of the material to be heated is lower than when the detected temperature is lower than a predetermined value. The induction heating apparatus according to any one of claims 1 to 10, wherein the conveyance speed of the heating material is reduced or the conveyance interval of the material to be heated is widened.
段と、該画像を加熱処理する像加熱手段とを有し、 該加熱手段として請求項１〜１１のいずれか１項に記載
の誘導加熱装置を備えたことを特徴とする画像形成装
置。12. The image forming apparatus according to claim 1, further comprising: an image forming unit that forms an image on a recording material; and an image heating unit that heats the image. An image forming apparatus comprising an induction heating device.
投と、基準温度を維持するように通電制御され該画像を
加熱処理する像加熱手段と、当該像加熱手段の温度を検
知する温度検知素子と、該記録材の搬送間隔を制御する
手段または該記録材の搬送速度を制御する手段の少なく
とも一つ、を有し、 上記制御手段が、上記温度検知素子の検知温度とあらか
じめ決定してあった所定温度との差分の大きさに基づき
記録材の搬送間隔または記録材の搬送速度の少なくとも
一つを制御する画像形成装置において、 該像加熱手段として請求項１〜１０のいずれか１項に記
載の誘導加熱装置を備えたことを特徴とする画像形成装
置。13. An image forming method for forming an image on a recording material, an image heating means for controlling the power supply so as to maintain a reference temperature and heating the image, and detecting a temperature of the image heating means. A temperature detecting element, and at least one of a unit for controlling a conveying interval of the recording material or a unit for controlling a conveying speed of the recording material, wherein the control unit determines in advance the detected temperature of the temperature detecting element. 11. An image forming apparatus for controlling at least one of a recording material conveyance interval and a recording material conveyance speed based on a magnitude of a difference from a predetermined temperature, wherein the image heating means is any one of claims 1 to 10. An image forming apparatus comprising the induction heating device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30386199A JP2001126856A (en) | 1999-10-26 | 1999-10-26 | Induction heating unit and image forming unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30386199A JP2001126856A (en) | 1999-10-26 | 1999-10-26 | Induction heating unit and image forming unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001126856A true JP2001126856A (en) | 2001-05-11 |
Family
ID=17926177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30386199A Withdrawn JP2001126856A (en) | 1999-10-26 | 1999-10-26 | Induction heating unit and image forming unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001126856A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7010241B2 (en) | 2004-03-22 | 2006-03-07 | Kabushiki Kaisha Toshiba | Image forming apparatus, image forming method, and fixing device thereof |
| JP2007156171A (en) * | 2005-12-06 | 2007-06-21 | Canon Inc | Image heating device |
| CN111133835A (en) * | 2017-10-17 | 2020-05-08 | 日本Tmt机械株式会社 | Heating roller and spinning stretching device |
| CN111630937A (en) * | 2018-02-23 | 2020-09-04 | 日本Tmt机械株式会社 | Heating roller and spinning stretching device |
| EP3758444A4 (en) * | 2018-02-23 | 2021-11-24 | TMT Machinery, Inc. | Induction heating roller and spun yarn take-up machine |
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