JP2001183933A - Image heating device and image forming device - Google Patents
Image heating device and image forming deviceInfo
- Publication number
- JP2001183933A JP2001183933A JP37015599A JP37015599A JP2001183933A JP 2001183933 A JP2001183933 A JP 2001183933A JP 37015599 A JP37015599 A JP 37015599A JP 37015599 A JP37015599 A JP 37015599A JP 2001183933 A JP2001183933 A JP 2001183933A
- Authority
- JP
- Japan
- Prior art keywords
- image
- heating
- exciting
- magnetic material
- exciting coil
- 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.)
- Granted
Links
Landscapes
- 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、像加熱装置及び画
像形成装置に関するものであり、例えば電子写真プロセ
ス利用のレーザープリンタ、複写機等の画像形成装置、
そして該画像形成装置において転写材上のトナー像を溶
融定着する定着装置（像加熱装置）に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image heating apparatus and an image forming apparatus, for example, an image forming apparatus such as a laser printer and a copying machine utilizing an electrophotographic process,
The present invention also relates to a fixing device (image heating device) for fusing and fixing a toner image on a transfer material in the image forming apparatus.
【０００２】[0002]
【従来の技術】電子写真方式を用いた画像形成装置は、
通常転写材と静電的に該転写材に但持された樹脂、磁性
体、着色料等からなるトナーとを、互いに圧接・回転し
ている加熱手段（ローラ、エンドレスベルト体等）と加
圧手段（ローラ、エンドレスベルト体等）の圧接部（ニ
ップ部）で狭持搬送しながら熱と圧力を加えることなど
で、溶融定着せしめる定着装置を有している。2. Description of the Related Art An image forming apparatus using an electrophotographic method is:
The normal transfer material and the toner electrostatically held by the transfer material, such as a resin, a magnetic material, a colorant, etc., are pressed against and rotated by a heating means (roller, endless belt body, etc.) rotating and pressing each other. It has a fixing device that applies heat and pressure while nipping and conveying at a pressure contact portion (nip portion) of a means (roller, endless belt body, etc.) to perform fusing and fixing.
【０００３】このような定着装置において、加熱するた
めの手段として励磁コイルによる磁束で定着ローラ内面
に設けた導電層に渦電流を発生させジュール熱により発
熱させる方法が提案されている。この方法は熱発生源を
トナーのごく近くに置くことができるので、従来のハロ
ゲンランプを用いた熱ローラ方式に比して、定着装置起
動時に定着ローラ表面の温度が定着に適当な温度になる
までに要する時間が短くできるという特徴がある。また
熱発生源からトナーヘの熱伝達経路が短く単純であるた
め熱効率が高いという特徴もある。In such a fixing device, as a means for heating, there has been proposed a method of generating an eddy current in a conductive layer provided on the inner surface of the fixing roller by a magnetic flux from an exciting coil to generate heat by Joule heat. In this method, the heat source can be placed very close to the toner, so that the temperature of the surface of the fixing roller becomes a suitable temperature for fixing when the fixing device is started, as compared with the conventional heat roller method using a halogen lamp. There is a feature that the time required until can be shortened. Another feature is that the heat transfer path from the heat generation source to the toner is short and simple, so that the heat efficiency is high.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来例の様な励磁コイルによる磁束で、定着ローラ内面に
設けた導電層に、渦電流を発生させジュール熱により発
熱させる電磁誘導加熱方式の定着装置は、励磁コイルと
定着ローラ内面の導電層の間隔をなるべく狭くしないと
効率良く電磁誘導が行えないため、励磁コイルを回転す
る定着ローラと接触しないなるべく近い位置に安定して
配置しなければならないのだが、コイル線の自重・剛性
により、常に同じ位置に安定していることが難しかっ
た。However, an electromagnetic induction heating type fixing device in which an eddy current is generated in a conductive layer provided on the inner surface of a fixing roller by magnetic flux generated by an exciting coil as in the above-described conventional example and heat is generated by Joule heat. Since the electromagnetic induction cannot be efficiently performed unless the distance between the exciting coil and the conductive layer on the inner surface of the fixing roller is made as small as possible, the exciting coil must be stably arranged at a position as close as possible so as not to contact the rotating fixing roller. However, it was difficult to keep the coil wire stable at the same position due to its own weight and rigidity.
【０００５】また、定着ローラの内側に励磁コイルを配
置すると、励磁コイルの昇温が大きくなり、励磁コイル
が昇温すると発熱効率が悪くなることがあった。Further, when the exciting coil is disposed inside the fixing roller, the temperature of the exciting coil is increased, and when the temperature of the exciting coil is increased, the heat generation efficiency is sometimes deteriorated.
【０００６】そこで本発明は、励磁コイルを非磁性体で
覆うことにより、該励磁コイルの位置を安定させ、加熱
手段との隙間を小さくして発熱効率を向上させることを
可能とした像加熱装置及び画像形成装置の提供を目的と
している。Accordingly, the present invention provides an image heating apparatus in which the exciting coil is covered with a non-magnetic material to stabilize the position of the exciting coil and reduce the gap between the exciting coil and the heating means to improve the heat generation efficiency. And an image forming apparatus.
【０００７】[0007]
【課題を解決するための手段】本発明の像加熱装置及び
画像形成装置は、上記課題を解決するために下記の構成
を特徴とするものである。An image heating apparatus and an image forming apparatus according to the present invention have the following features to solve the above-mentioned problems.
【０００８】〔１〕：回転可能な加熱手段と、該加熱手
段を電磁誘導により発熱させる励磁手段とを有し、該加
熱手段からの熱により記録材上に形成された画像を加熱
する像加熱装置において、前記励磁手段が、励磁コイル
と、この励磁コイルの周囲を覆う非磁性体とを有してな
り、この非磁性体が前記加熱手段に対し所定の隙間をあ
けて配置されたことを特徴とする像加熱装置。[1]: An image heating device having rotatable heating means and exciting means for causing the heating means to generate heat by electromagnetic induction, and heating the image formed on the recording material by the heat from the heating means. In the apparatus, the exciting means has an exciting coil and a non-magnetic material covering the periphery of the exciting coil, and the non-magnetic material is arranged with a predetermined gap from the heating means. Characteristic image heating device.
【０００９】〔２〕：前記励磁コイルと前記非磁性体は
密着されていることを特徴とする〔１〕記載の像加熱装
置。[2] The image heating apparatus according to [1], wherein the excitation coil and the non-magnetic material are in close contact with each other.
【００１０】〔３〕：前記励磁コイルと前記非磁性体は
密着固定されていることを特徴とする〔１〕又は〔２〕
記載の像加熱装置。[3]: [1] or [2], wherein the exciting coil and the non-magnetic material are fixedly adhered to each other.
The image heating device according to claim 1.
【００１１】〔４〕：前記励磁コイルは前記非磁性体と
一体成形で構成されることを特徴とする〔１〕，〔２〕
又は〔３〕記載の像加熱装置。[4]: The excitation coil is formed integrally with the non-magnetic material [1], [2].
Or the image heating device according to [3].
【００１２】〔５〕：前記励磁コイルと一体成形される
非磁性体は樹脂であることを特徴とする〔４〕記載の像
加熱装置。[5] The image heating apparatus according to [4], wherein the non-magnetic material integrally formed with the excitation coil is a resin.
【００１３】〔６〕：前記励磁手段が励磁コアを有し、
前記非磁性体が磁性体コアのホルダーを兼用しているこ
とを特徴とする〔１〕乃至〔５〕の何れか１項に記載の
像加熱装置。[6]: the exciting means has an exciting core,
The image heating apparatus according to any one of [1] to [5], wherein the non-magnetic material also serves as a holder for the magnetic material core.
【００１４】〔７〕：前記加熱手段が金属ローラである
ことを特徴とする〔１〕乃至〔６〕の何れか１項に記載
の像加熱装置。[7] The image heating apparatus according to any one of [1] to [6], wherein the heating means is a metal roller.
【００１５】〔８〕：前記画像を記録材上に定着させる
ことを特徴とする〔１〕乃至〔７〕の何れか１項に記載
の像加熱装置。[8] The image heating apparatus according to any one of [1] to [7], wherein the image is fixed on a recording material.
【００１６】[0016]
〔９〕：記録材上に画像を形成する像形成
手段と、該記録材上の画像を加熱する像加熱手段とを有
する画像形成装置において、像加熱手段として〔１〕乃
至〔８〕の何れか１項に記載の像加熱装置を備えたこと
を特徴とする画像形成装置。[9]: In an image forming apparatus having an image forming unit for forming an image on a recording material and an image heating unit for heating the image on the recording material, any one of [1] to [8] as the image heating unit An image forming apparatus comprising the image heating device according to claim 1.
【００１７】〈作 用〉上記の構成によれば、励磁コイ
ルの周囲を非磁性体で覆っているので、該コイルを構成
する導線の配置が乱れず、励磁コイルの位置が安定し、
加熱手段と摺接しないように該加熱手段との間に設ける
隙間を小さく設定できるようになり、発熱効率の向上を
可能としている。<Operation> According to the above configuration, since the periphery of the exciting coil is covered with the non-magnetic material, the arrangement of the conductors constituting the coil is not disturbed, and the position of the exciting coil is stabilized.
The gap provided between the heating means and the heating means can be set to be small so as not to be in sliding contact with the heating means, thereby improving the heat generation efficiency.
【００１８】[0018]
【発明の実施の形態】〈第一の実施形態〉図１は本発明
を示す定着装置の概略構成図、図２は該定着装置の長手
方向（記録材幅方向）に沿う模式縦断面図、図３は該定
着装置の上部筐体と下部筐体の概略斜視図である。な
お、画像形成における一連のプロセスは後述する。DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a schematic configuration diagram of a fixing device according to the present invention, FIG. 2 is a schematic longitudinal sectional view of the fixing device along a longitudinal direction (recording material width direction), FIG. 3 is a schematic perspective view of an upper housing and a lower housing of the fixing device. A series of processes in image formation will be described later.
【００１９】図中、１は加熱手段としての定着ローラ、
２は該定着ローラ（加熱手段）１と圧接して圧接ニップ
部（定着ニップ部）Ｎを形成する加圧ローラ（加圧部
材）である。In the figure, 1 is a fixing roller as a heating means,
Reference numeral 2 denotes a pressing roller (pressing member) that presses against the fixing roller (heating means) 1 to form a press-contact nip portion (fixing nip portion) N.
【００２０】該定着ローラ１は、両端部が回転可能に支
持され、加圧部材と圧接した際、所要のニップ圧が得ら
れる剛性を有したローラであり、本例では、外径３２ｍ
ｍ、厚さ０．７ｍｍの鉄製の芯金シリンダに表面の離型
性を高めるために、例えばＰＴＦＥやＰＦＡの層を１０
〜５０μｍ設けた構成となっている。また、定着ローラ
１の材料として、例えば磁性ステンレスのような磁性材
料（磁性金属）といった、比較的透磁率が高く、適当な
抵抗率を持つものを用いても良い。さらに非磁性材料で
も、金属などの導電性のある材料は、材料を薄膜にする
ことなどにより使用可能である。The fixing roller 1 is a roller whose both ends are rotatably supported and has rigidity to obtain a required nip pressure when pressed against a pressing member. In this embodiment, the outer diameter is 32 m.
m, a 0.7 mm thick iron core cylinder, for example, a layer of PTFE or PFA
５０50 μm. Further, as the material of the fixing roller 1, for example, a material having a relatively high magnetic permeability and an appropriate resistivity, such as a magnetic material (magnetic metal) such as a magnetic stainless steel, may be used. Further, among the non-magnetic materials, a conductive material such as a metal can be used by making the material into a thin film.
【００２１】加圧ローラ２は、外径２０ｍｍの鉄製の芯
金の外周に厚さ５ｍｍのシリコンゴムの層と、定着ロー
ラ１と同様に表面の離型性を高めるため例えばＰＴＦＥ
やＰＦＡによる１０〜５０μｍの層とを設け、外径約３
０ｍｍになっている。The pressure roller 2 has a 5 mm-thick silicon rubber layer on the outer periphery of an iron core bar having an outer diameter of 20 mm.
And a layer of 10 to 50 μm by PFA and an outer diameter of about 3
0 mm.
【００２２】加圧ローラ２は軸受け２ａに回転自在に受
止められていて、該軸受け２ａが定着器下部筐体１０ａ
の側板１０ａ１に設けられた縦溝１０ａ２に落とし込ま
れて上下動可能となっており、この加圧ローラ２の上方
には定着ローラ１が軸受け１ａを介して側板１０ａ１に
取付けられている。そして該加圧ローラ２は、バネ等の
加圧手段１１により上方向に加圧され、定着ローラ１に
対して圧接している。また、定着ローラ１は、片側端部
に外嵌されたリング状のギア１ｂを介して不図示の駆動
駆動手段により回転駆動を受け、ニップ部Ｎでの摩擦力
で加圧ローラ２を従動回転させている。The pressure roller 2 is rotatably received by a bearing 2a.
The fixing roller 1 is dropped on a vertical groove 10a2 provided in the side plate 10a1 and can move up and down. A fixing roller 1 is mounted on the side plate 10a1 via a bearing 1a above the pressure roller 2. The pressure roller 2 is pressed upward by pressure means 11 such as a spring, and is in pressure contact with the fixing roller 1. Further, the fixing roller 1 is rotationally driven by a driving drive unit (not shown) via a ring-shaped gear 1 b externally fitted to one end of the fixing roller 1, and the pressure roller 2 is driven to rotate by the frictional force at the nip N. Let me.
【００２３】温度センサー３は定着ローラ１の表面に当
接するように配置され、温度センサー３の検出信号であ
る電圧をＡ／Ｄ変換し、コントローラ部２０にて励磁コ
イル８ａ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ように自動制御さ
れる。The temperature sensor 3 is arranged so as to be in contact with the surface of the fixing roller 1, A / D-converts a voltage which is a detection signal of the temperature sensor 3, and increases / decreases the power supply to the exciting coil 8 a by the controller 20. By doing so, automatic control is performed so that the surface temperature of the fixing roller 1 becomes a predetermined constant temperature.
【００２４】このような構成よりなる本実施形態の定着
装置では、定着ローラ１の回転駆動及び加熱が開始さ
れ、該定着ローラ１が、所定の速度で安定して回転する
と共に、所定の定着温度に温度調節された状態で、未定
着トナー像Ｔを担持した記録材Ｐがニップ部Ｎに導入さ
れて、該ニップ部Ｎの圧接圧と、定着ローラ１からの熱
により該トナー像Ｔを記録材Ｐに定着させる。In the fixing device of this embodiment having the above-described configuration, the rotation driving and the heating of the fixing roller 1 are started, and the fixing roller 1 stably rotates at a predetermined speed and a predetermined fixing temperature. The recording material P carrying the unfixed toner image T is introduced into the nip portion N in a state where the temperature has been adjusted to the temperature, and the toner image T is recorded by the pressure of the nip portion N and the heat from the fixing roller 1. Fix to material P.
【００２５】次に、励磁手段について詳しく説明する。Next, the exciting means will be described in detail.
【００２６】８は、上記定着ローラ１に磁力を作用させ
て誘導電流を生じさせ、そのジュール熱により発熱（電
磁誘導発熱）させる励磁手段である。該励磁手段８は、
励磁コイル８ａと、該励磁コイル８ａを覆う非磁性体
（本例では樹脂）８ｂとを有してなり、本例では更に励
磁コア６を有している。Reference numeral 8 denotes an exciting unit that generates an induced current by applying a magnetic force to the fixing roller 1 and generates heat (electromagnetically induced heat) by the Joule heat. The excitation means 8
It has an exciting coil 8a and a nonmagnetic material (resin in this example) 8b that covers the exciting coil 8a. In this example, it further has an exciting core 6.
【００２７】該励磁コイル８ａには高周波コンバータ１
０が接続され１００〜２０００ｋＷの高周波電力が供給
されるため、細い線を数本リッツにしたものを用いてお
り、そのリッツ線を図４のように巻いた状態で保持し、
樹脂で覆うように一体成形する。The exciting coil 8a includes a high-frequency converter 1
0 is connected and a high-frequency power of 100 to 2000 kW is supplied, so that a thin wire made of several litz is used, and the litz wire is held in a wound state as shown in FIG.
Integrally molded to cover with resin.
【００２８】該樹脂の種類としては、ＰＰＳ、ＰＢＴ，
ＰＥＴ、ＬＣＰ（液晶ポリマー）等を用いている。励磁
コイル８ａと一体成形された励磁コイルユニット８の斜
視図を図５に、断面図を図６に示す。またコイルユニッ
ト８の樹脂部８ｂは磁性体コア６（６ａ、６ｂ、６ｃ）
のホルダーも兼用しており、各々８５、８６、８７の位
置に各コア６ａ、６ｂ、６ｃが設置される（図７）。磁
性体コア６にはフェライトといった高透磁率かつ低損失
のものを用いる。パーマロイのような合金の場合は、コ
ア内の渦電流損失が高周波で大きくなるため積層構造に
しても良い。コア６は磁気回路の効率を上げるためと磁
気遮断のために用いている。The types of the resin include PPS, PBT,
PET, LCP (liquid crystal polymer) or the like is used. FIG. 5 is a perspective view of the excitation coil unit 8 integrally formed with the excitation coil 8a, and FIG. 6 is a cross-sectional view thereof. In addition, the resin portion 8b of the coil unit 8 includes the magnetic core 6 (6a, 6b, 6c).
The cores 6a, 6b, 6c are installed at the positions of 85, 86, 87, respectively (FIG. 7). The magnetic core 6 is made of a material having high magnetic permeability and low loss such as ferrite. In the case of an alloy such as permalloy, an eddy current loss in the core increases at high frequencies, so that a laminated structure may be used. The core 6 is used for increasing the efficiency of the magnetic circuit and for shutting off the magnetic field.
【００２９】コイルユニット８はステー５に取付けら
れ、該コイルユニット８の樹脂部８ｂと定着ローラ内面
との間に所定の隙間ｄを空けるように該ステー５が上部
筐体１０ｂの側板１０ｂ１に固定される。該隙間ｄは各
部材の寸法及び取付けの公差を考慮して最小の値に設定
している。The coil unit 8 is mounted on the stay 5, and the stay 5 is fixed to the side plate 10b1 of the upper housing 10b so as to leave a predetermined gap d between the resin portion 8b of the coil unit 8 and the inner surface of the fixing roller. Is done. The gap d is set to a minimum value in consideration of the dimensions of each member and the mounting tolerance.
【００３０】このように、励磁コイル８ａが非磁性体
（樹脂）と一体成形され固定されているので、定着ロー
ラ芯金（導電層）との距離が設定の位置で安定し、効率
良く加熱をすることができる。また、励磁コイル８ａは
高温になると電流が流れにくくなり電源効率が悪くなる
が、本実施形態によれば励磁コイル８ａの周囲には空気
ではなく非磁性体（樹脂）が密着しているので、放熱効
果が高く励磁コイル８ａの昇温を抑制できる。また、磁
性体コア６も同様に、キュリー温度を越えると透磁率が
急激に悪くなり発熱効率が悪化するが、樹脂部８ｂに保
持され、放熱効果が高いため磁性体コア６の昇温を抑制
できる。As described above, since the exciting coil 8a is integrally formed with and fixed to the non-magnetic material (resin), the distance from the fixing roller core metal (conductive layer) is stabilized at the set position, and the heating is efficiently performed. can do. Also, when the temperature of the exciting coil 8a becomes high, current hardly flows and the power supply efficiency deteriorates. However, according to the present embodiment, a non-magnetic material (resin) is tightly adhered to the periphery of the exciting coil 8a instead of air. The heat radiation effect is high and the temperature rise of the exciting coil 8a can be suppressed. Similarly, when the magnetic core 6 exceeds the Curie temperature, the magnetic permeability sharply deteriorates and the heat generation efficiency deteriorates. However, since the magnetic core 6 is held by the resin portion 8b and has a high heat radiation effect, the temperature rise of the magnetic core 6 is suppressed. it can.
【００３１】また、励磁コイルと一体成形されたコイル
ユニット８は磁性体コア６のホルダーを兼用しているの
で、装置のコンパクト化が可能となる。そして励磁コイ
ル８ａと磁性体コア６の位置精度が出易くなるため、発
熱効率が良くなる。Since the coil unit 8 integrally formed with the exciting coil also serves as a holder for the magnetic core 6, the apparatus can be made compact. Further, since the positional accuracy between the exciting coil 8a and the magnetic core 6 is easily increased, the heat generation efficiency is improved.
【００３２】よって、消費電力を削減する効果を生む。Therefore, the effect of reducing power consumption is produced.
【００３３】そして、この非磁性体が磁性体コアのホル
ダーを兼用しているので、装置のコンパクト化によるコ
ストダウンが期待でき、励磁コイルと磁性体コアに位置
精度ＵＰに貢献する。Since the non-magnetic material also serves as a holder for the magnetic material core, cost reduction can be expected by downsizing the apparatus, and contributes to the positional accuracy UP of the exciting coil and the magnetic material core.
【００３４】なお、上記の実施形態では、励磁コイル８
ａと樹脂部８ｂを一体成形したが、励磁コイル８ａと樹
脂部８ｂと励磁コア６を一体成形しても良い。In the above embodiment, the exciting coil 8
a and the resin portion 8b are integrally formed, but the excitation coil 8a, the resin portion 8b and the excitation core 6 may be integrally formed.
【００３５】また、励磁手段８は、一体成形に限らず、
図８に示すように支持体８ｃと励磁コイル８ａと励磁コ
ア６等を熱収縮チューブ８ｄで密着させた構成であって
も同様の効果が得られる。Further, the exciting means 8 is not limited to the integral molding.
As shown in FIG. 8, the same effect can be obtained even in a configuration in which the support 8c, the exciting coil 8a, the exciting core 6 and the like are closely adhered by the heat shrinkable tube 8d.
【００３６】更に、上記実施形態では、コイルユニット
（励磁手段）８を定着ローラ内側に設けたが図９に示す
ように定着ローラ外側に間隔ｄを空けて配置しても良
い。Further, in the above embodiment, the coil unit (exciting means) 8 is provided inside the fixing roller, but may be arranged outside the fixing roller with a space d as shown in FIG.
【００３７】〈画像形成装置例〉図１０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. 10 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.
【００３８】２１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
２２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 21 denotes a rotating drum type electrophotographic photosensitive member (hereinafter, referred to as a photosensitive drum) as a first image bearing member, which is rotationally driven at a predetermined peripheral speed (process speed) in a clockwise direction indicated by an arrow. , it is uniformly charged to a predetermined negative dark potential V D by a primary charger 22 in the rotation process.
【００３９】２３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２１の一様帯電
処理面を走査露光する。Reference numeral 23 denotes a laser beam scanner, which is a laser beam L modulated corresponding to 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). To scan and expose the uniformly charged surface of the rotating photosensitive drum 21.
【００４０】このレーザービーム走査露光により、回転
感光ドラム２１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２
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２４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Ｔ
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 rotary photosensitive drum 21 has a small absolute potential value and 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 of the photosensitive drum surface) with the negatively charged powder toner by the developing device 24, and the toner image T
Is visualized as
【００４１】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２５と感光ドラム２１との圧接ニップ部
（転写部）へ感光ドラム２１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２１面側のトナー画像Ｔ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 nip (transfer portion) between a transfer roller 25 as a transfer member to which a transfer bias is applied and a photosensitive drum 21 by a photosensitive drum. The recording material P is fed at an appropriate timing synchronized with the rotation of the rotation of the photosensitive drum 21, and the toner image T on the surface of the photosensitive drum 21 is sequentially transferred to the surface of the recording material P.
【００４２】そして、これらの各要素２１，２２，２
３，２４，２５等で構成された像形成手段により未定着
トナー画像Ｔが形成された記録材Ｐは、回転感光ドラム
２１面から分離され、前記実施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Ｔ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, these elements 21, 22, 2
The recording material P on which the unfixed toner image T has been formed by the image forming means composed of 3, 24, 25, and the like is separated from the surface of the rotating photosensitive drum 21 and the fixing device (image heating means) described in the above embodiment. The toner image T is introduced into the R, undergoes a fixing process, and is discharged out of the apparatus as an image formed product (print).
【００４３】なお、記録材分離後の回転感光ドラム２１
面はクリーニング装置２６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 21 after the recording material is separated
The surface is cleaned by the cleaning device 26 to remove the residual toner such as toner remaining after transfer, and the surface is repeatedly provided for image formation.
【００４４】[0044]
【発明の効果】以上説明したように、励磁コイルを非磁
性体で覆うことにより、該励磁コイルの位置を安定さ
せ、加熱手段との隙間を小さくして発熱効率を向上させ
ることを可能とした像加熱装置及び画像形成装置を提供
することができる。As described above, by covering the exciting coil with a non-magnetic material, it is possible to stabilize the position of the exciting coil, reduce the gap between the exciting coil and the heating means, and improve the heat generation efficiency. An image heating device and an image forming device can be provided.
【図１】 本発明に係る定着装置の概略構成図FIG. 1 is a schematic configuration diagram of a fixing device according to the present invention.
【図２】 本発明に係る定着装置の模式縦断面図FIG. 2 is a schematic longitudinal sectional view of a fixing device according to the present invention.
【図３】 本発明に係る定着装置の筐体の説明図FIG. 3 is an explanatory view of a housing of the fixing device according to the present invention.
【図４】 本発明に係る励磁コイルの説明図FIG. 4 is an explanatory view of an exciting coil according to the present invention.
【図５】 本発明に係る励磁手段の外観斜視図FIG. 5 is an external perspective view of an exciting unit according to the present invention.
【図６】 本発明に係る励磁手段の要部断面図FIG. 6 is a sectional view of a main part of an exciting unit according to the present invention.
【図７】 本発明に係る励磁手段の断面図FIG. 7 is a cross-sectional view of an exciting unit according to the present invention.
【図８】 本発明に係る励磁手段の他の構成を示す説明
図、（ａ）は熱収縮チューブによる密着固定前、（ｂ）
は熱収縮チューブによる密着固定後の状態図8A and 8B are explanatory views showing another configuration of the exciting means according to the present invention, wherein FIG.
Shows the state after the heat-shrinkable tube has been attached and fixed
【図９】 本発明に係る定着装置の他の構成を示す概略
構成図FIG. 9 is a schematic configuration diagram showing another configuration of the fixing device according to the present invention.
【図１０】 本発明に係る画像形成装置の概略構成図FIG. 10 is a schematic configuration diagram of an image forming apparatus according to the present invention.
１ 定着ローラ（加熱手段） ２ 加圧ローラ ３ 温度センサー ５ ステー ６ 励磁コア ８ コイルユニット（励磁手段） １０ 高周波コンバータ １０ｂ 上部筐体 １０ａ 下部筐体 １１ 加圧手段 ２０ コントローラ部 Ｎ ニップ部 Ｐ 記録材 Ｔ トナー画像 DESCRIPTION OF SYMBOLS 1 Fixing roller (heating means) 2 Pressure roller 3 Temperature sensor 5 Stay 6 Exciting core 8 Coil unit (Exciting means) 10 High frequency converter 10b Upper case 10a Lower case 11 Pressing means 20 Controller part N Nip part P Recording material T toner image
Claims (9)
磁誘導により発熱させる励磁手段とを有し、該加熱手段
からの熱により記録材上に形成された画像を加熱する像
加熱装置において、 前記励磁手段が、励磁コイルと、この励磁コイルの周囲
を覆う非磁性体とを有してなり、この非磁性体が前記加
熱手段に対し所定の隙間をあけて配置されたことを特徴
とする像加熱装置。1. An image heating apparatus comprising: a rotatable heating means; and an exciting means for causing the heating means to generate heat by electromagnetic induction, and heating an image formed on a recording material by heat from the heating means. The excitation means has an excitation coil and a non-magnetic material covering the periphery of the excitation coil, and the non-magnetic material is arranged with a predetermined gap from the heating means. Image heating device.
れていることを特徴とする請求項１記載の像加熱装置。2. An image heating apparatus according to claim 1, wherein said excitation coil and said non-magnetic material are in close contact with each other.
定されていることを特徴とする請求項１又は２記載の像
加熱装置。3. The image heating apparatus according to claim 1, wherein said excitation coil and said non-magnetic material are fixedly adhered to each other.
形で構成されることを特徴とする請求項１，２又は３記
載の像加熱装置。4. An image heating apparatus according to claim 1, wherein said excitation coil is formed integrally with said non-magnetic material.
体は樹脂であることを特徴とする請求項４記載の像加熱
装置。5. The image heating apparatus according to claim 4, wherein the non-magnetic material integrally formed with the excitation coil is a resin.
磁性体が磁性体コアのホルダーを兼用していることを特
徴とする請求項１乃至５の何れか１項に記載の像加熱装
置。6. The image heating apparatus according to claim 1, wherein said exciting means has an exciting core, and said non-magnetic material also serves as a holder for said magnetic material core. apparatus.
特徴とする請求項１乃至６の何れか１項に記載の像加熱
装置。7. The image heating apparatus according to claim 1, wherein said heating means is a metal roller.
特徴とする請求項１乃至７の何れか１項に記載の像加熱
装置。8. The image heating apparatus according to claim 1, wherein the image is fixed on a recording material.
と、該記録材上の画像を加熱する像加熱手段とを有する
画像形成装置において、 像加熱手段として請求項１乃至８の何れか１項に記載の
像加熱装置を備えたことを特徴とする画像形成装置。9. An image forming apparatus comprising: an image forming unit for forming an image on a recording material; and an image heating unit for heating the image on the recording material, wherein the image heating unit is used as the image heating unit. An image forming apparatus comprising the image heating device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37015599A JP3619095B2 (en) | 1999-12-27 | 1999-12-27 | Image heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37015599A JP3619095B2 (en) | 1999-12-27 | 1999-12-27 | Image heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001183933A true JP2001183933A (en) | 2001-07-06 |
| JP3619095B2 JP3619095B2 (en) | 2005-02-09 |
Family
ID=18496203
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP37015599A Expired - Fee Related JP3619095B2 (en) | 1999-12-27 | 1999-12-27 | Image heating device |
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| Country | Link |
|---|---|
| JP (1) | JP3619095B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7239836B2 (en) | 2002-08-23 | 2007-07-03 | Kyocera Mita Corporation | Fixing apparatus |
| JP2012159829A (en) * | 2011-01-11 | 2012-08-23 | Ricoh Co Ltd | Fixing device and image forming apparatus |
-
1999
- 1999-12-27 JP JP37015599A patent/JP3619095B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7239836B2 (en) | 2002-08-23 | 2007-07-03 | Kyocera Mita Corporation | Fixing apparatus |
| US7480479B2 (en) | 2002-08-23 | 2009-01-20 | Kyocera Mita Corporation | Fixing apparatus |
| JP2012159829A (en) * | 2011-01-11 | 2012-08-23 | Ricoh Co Ltd | Fixing device and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3619095B2 (en) | 2005-02-09 |
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