JP2014048513A - Fixing device and image forming device - Google Patents

Fixing device and image forming device Download PDF

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JP2014048513A
JP2014048513A JP2012192102A JP2012192102A JP2014048513A JP 2014048513 A JP2014048513 A JP 2014048513A JP 2012192102 A JP2012192102 A JP 2012192102A JP 2012192102 A JP2012192102 A JP 2012192102A JP 2014048513 A JP2014048513 A JP 2014048513A
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electromagnetic induction
induction coil
fixing device
coils
current
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JP2014048513A5 (en
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Junji Ishikawa
潤司 石川
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Canon Inc
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Canon Inc
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  • General Induction Heating (AREA)

Abstract

PROBLEM TO BE SOLVED: To supply substantially the same amount of current to electromagnetic induction coils without using a high-current connector or a connection terminal, while reducing wiring space.SOLUTION: In a fixing unit 911 of an electromagnetic induction heating system, a first electromagnetic induction coil 91-1 and a second electromagnetic induction coil 91-2 are twisted with each other. The first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 are arranged so that average distances to a fixing roller 92 are equal.

Description

本発明は、電磁誘導加熱方式を用いた定着装置及びその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 using an electromagnetic induction heating method and an image forming apparatus including the fixing device.

一般に画像形成装置においては、用紙に転写されたトナー像を定着させるための定着器が備えられている。定着器としては、従来セラミックヒーターやハロゲンヒーターによる加熱方式が多く用いられていたが、近年では電磁誘導加熱方式が用いられるようになっている。電磁誘導加熱方式の定着器は、磁性材料からなる定着ベルト(又は定着ローラー)と相対し磁性体コアで磁路を形成しつつ電磁気的に結合して配置された電磁誘導コイルと、電磁誘導コイルに高周波電流を流して高周波磁界を発生させる電源とを有する。そして、高周波磁界を定着ベルトに作用させて定着ベルトに渦電流を流すことで定着ベルトを発熱させている。このように構成された定着器では、定着ベルトの温度を検出する温度センサによる検出結果に基づいて電磁誘導コイルに流す高周波電流を制御することによって、定着ベルトの温度を所定の温度に制御している。   Generally, an image forming apparatus is provided with a fixing device for fixing a toner image transferred onto a sheet. As a fixing device, a heating method using a ceramic heater or a halogen heater has been conventionally used. However, in recent years, an electromagnetic induction heating method has been used. An electromagnetic induction heating type fixing device includes an electromagnetic induction coil that is disposed in an electromagnetically coupled manner while forming a magnetic path with a magnetic core facing a fixing belt (or fixing roller) made of a magnetic material, and an electromagnetic induction coil And a power source for generating a high-frequency magnetic field by supplying a high-frequency current to the power source. Then, the fixing belt is heated by applying an eddy current to the fixing belt by applying a high-frequency magnetic field to the fixing belt. In the fixing device configured as described above, the temperature of the fixing belt is controlled to a predetermined temperature by controlling the high-frequency current that flows through the electromagnetic induction coil based on the detection result of the temperature sensor that detects the temperature of the fixing belt. Yes.

電磁誘導加熱方式における定着器の電気的なインピーダンスは、セラミックヒーターやハロゲンヒーターと比較して力率が0.2〜0.4と低い。電流と電圧の実効値の積に力率を乗じたものが有効電力であり、大きな発熱量を得ようとすると、大電流又は高電圧を供給する必要がある。大電流を供給することで発熱量を得ようとした場合、高価で大型のコネクタが必要になってしまうという課題がある。電磁誘導コイルは、表面に絶縁皮膜を有するφ(線径)0.1(mm)〜φ0.2の細線を100〜300本束ねたリッツ線で構成されているが、上述の課題の解決方法として、次のような方法が提案されている。例えば図6に示すように、電磁誘導コイル91のリッツ線を接続端子89−1及び89−2で一度全て導通させ、その後二股に分岐して各コネクタ98−1と98−2、98−3と98−4に流れる電流を略均等に半分ずつにする。これにより大電流用のコネクタを必要としない方法が提案されている(例えば、特許文献1、2参照)。   The electric impedance of the fixing device in the electromagnetic induction heating method has a power factor as low as 0.2 to 0.4 as compared with a ceramic heater or a halogen heater. The product of the effective value of the current and voltage multiplied by the power factor is the active power. To obtain a large calorific value, it is necessary to supply a large current or high voltage. When it is going to obtain the calorific value by supplying a large current, there exists a subject that an expensive and large-sized connector will be needed. The electromagnetic induction coil is composed of litz wires in which 100 to 300 fine wires having a diameter (diameter) of 0.1 (mm) to φ0.2 having an insulating film on the surface are bundled. The following methods have been proposed. For example, as shown in FIG. 6, the litz wire of the electromagnetic induction coil 91 is made to conduct once at connection terminals 89-1 and 89-2, and then bifurcated to each connector 98-1, 98-2 and 98-3. And the current flowing in 98-4 are halved substantially equally. Thus, a method that does not require a connector for large current has been proposed (see, for example, Patent Documents 1 and 2).

特許第4656644号公報Japanese Patent No. 4656644 特許第4652943号公報Japanese Patent No. 4652943

しかしながら、上述した図6に示す従来の方法では、各コネクタに流れる電流を略半分にするためにリッツ線を一度全て導通させる接続端子89−1及び89−2が必要となる。このため、接続端子89−1及び89−2の追加による配線スペースの拡大につながるという課題がある。このような配線スペースの拡大は、そのまま装置の拡大に直結してしまう。   However, in the conventional method shown in FIG. 6 described above, the connection terminals 89-1 and 89-2 for conducting all the litz wires once are necessary in order to halve the current flowing through each connector. For this reason, there exists a subject that it leads to the expansion of wiring space by addition of the connecting terminals 89-1 and 89-2. Such expansion of the wiring space directly leads to expansion of the device.

本発明は、このような状況のもとでなされたもので、大電流用コネクタも接続端子も用いずに各電磁誘導コイルに対して略均等な電流に分割して供給でき、且つ、配線スペースを縮小することを目的とする。   The present invention has been made under such circumstances, and can divide and supply substantially equal currents to each electromagnetic induction coil without using a large current connector and connection terminals, and can provide wiring space. It aims at reducing.

上述した課題を解決するために、本発明は以下の構成を備える。   In order to solve the above-described problems, the present invention has the following configuration.

(1)電磁誘導加熱方式の定着装置において、高周波の電流を供給する供給手段と、前記供給手段から電流を供給され、磁界を発生する複数のコイルと、前記複数のコイルが発生する磁界の作用により発熱する発熱手段と、前記発熱手段の温度を検出する検出手段と、前記検出手段により検出した前記発熱手段の温度に基づいて前記複数のコイルに供給する電流を制御する制御手段と、を備え、前記複数のコイルは、互いに撚り合わせられ、前記複数のコイルの夫々のコイルと前記発熱手段との平均距離が等しくなるように配置されることを特徴とする定着装置。   (1) In an electromagnetic induction heating type fixing device, a supply means for supplying a high-frequency current, a plurality of coils to which a current is supplied from the supply means to generate a magnetic field, and a magnetic field generated by the plurality of coils Heating means for generating heat, detection means for detecting the temperature of the heating means, and control means for controlling the current supplied to the plurality of coils based on the temperature of the heating means detected by the detection means. The fixing device is characterized in that the plurality of coils are twisted together and arranged so that an average distance between each of the plurality of coils and the heating means is equal.

(2)記録材に画像を形成する画像形成手段と、前記画像形成手段により形成された画像を記録材に定着させる前記(1)に記載の定着装置と、を備えることを特徴とする画像形成装置。   (2) An image forming apparatus comprising: an image forming unit that forms an image on a recording material; and the fixing device according to (1) that fixes the image formed by the image forming unit to the recording material. apparatus.

本発明によれば、大電流用コネクタも接続端子も用いずに各電磁誘導コイルに対して略均等な電流に分割して供給でき、且つ、配線スペースを縮小することができる。   According to the present invention, it is possible to divide and supply substantially equal current to each electromagnetic induction coil without using a large current connector and connection terminals, and to reduce the wiring space.

実施の形態の画像形成装置の概略構成図、主要回路のブロック図Schematic configuration diagram of image forming apparatus of embodiment, block diagram of main circuit 実施の形態の電磁誘導コイルの概略構成図Schematic configuration diagram of electromagnetic induction coil of embodiment 実施の形態の定着器の概略構成図、コイル電流波形を示す図Schematic configuration diagram of the fixing device of the embodiment, a diagram showing a coil current waveform 実施の形態の画像形成処理のフローチャートFlowchart of image forming process of embodiment 実施の形態の温度制御処理のフローチャートFlow chart of temperature control process of embodiment 従来例の電磁誘導コイルの概略構成図Schematic configuration diagram of conventional electromagnetic induction coil

以下、本発明を実施するための形態を、図面を用いて詳しく説明する。   Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

[実施の形態]
(画像形成装置の構成)
図1(a)は本実施の形態の画像形成装置の概略構成図であり、画像形成装置が備えるコントローラ200により実行される画像形成の動作とあわせて以下に説明する。プリンタ本体900は感光ドラム901yを備え、感光ドラム901yは反時計回り方向に回転しており、一次帯電ローラー902yが感光ドラム901yの表面を均一に帯電する。レーザーユニット903yは、均一に帯電した感光ドラム901yの表面にレーザー光を照射し、感光ドラム901yは露光され潜像画像が形成される。次に感光ドラム901y表面が現像スリーブ904yを通過し、現像スリーブ904yは感光ドラム901y上の潜像画像をイエロー色のトナーにより現像する。そして感光ドラム901yの表面は中間転写ベルト906と接する。一次転写ローラー905yに電圧が加えられることにより、一次転写ローラー905yは、感光ドラム901yの表面に形成されたイエロー色のトナー像を中間転写ベルト906の表面に転写する。同様に、マゼンタ色、シアン色、ブラック色についても夫々の色のトナー像が形成され、一次転写ローラー905m〜905kにより中間転写ベルト906の表面にそれぞれのトナー像が順次転写される。尚、イエロー色、マゼンタ色、シアン色、ブラック色の各色について、図1(a)では符号y、m、c、kを付しており、以下必要な場合を除き符号y、m、c、kを省略する。
[Embodiment]
(Configuration of image forming apparatus)
FIG. 1A is a schematic configuration diagram of an image forming apparatus according to the present embodiment, which will be described below together with an image forming operation executed by a controller 200 provided in the image forming apparatus. The printer main body 900 includes a photosensitive drum 901y. The photosensitive drum 901y rotates counterclockwise, and the primary charging roller 902y uniformly charges the surface of the photosensitive drum 901y. The laser unit 903y irradiates the surface of the uniformly charged photosensitive drum 901y with laser light, and the photosensitive drum 901y is exposed to form a latent image. Next, the surface of the photosensitive drum 901y passes through the developing sleeve 904y, and the developing sleeve 904y develops the latent image on the photosensitive drum 901y with yellow toner. The surface of the photosensitive drum 901y is in contact with the intermediate transfer belt 906. When the voltage is applied to the primary transfer roller 905y, the primary transfer roller 905y transfers the yellow toner image formed on the surface of the photosensitive drum 901y to the surface of the intermediate transfer belt 906. Similarly, toner images of magenta color, cyan color, and black color are formed, and the respective toner images are sequentially transferred onto the surface of the intermediate transfer belt 906 by the primary transfer rollers 905m to 905k. In addition, about each color of yellow color, magenta color, cyan color, and black color, the code | symbol y, m, c, and k is attached | subjected in Fig.1 (a), and code | symbol y, m, c, k is omitted.

中間転写ベルト906には、イエロー色、マゼンタ色、シアン色及びブラック色のトナー像が重畳して転写され、フルカラーのトナー像が形成される。そして、中間転写ベルト906上のフルカラーのトナー像が二次転写内ローラー907と二次転写外ローラー908を通過する。その際に中間転写ベルト906と二次転写外ローラー908の間を用紙カセット910から給紙された用紙913(記録材)が挟まれて搬送され、中間転写ベルト906上のフルカラーのトナー像が、用紙913の表面に転写される。尚、本実施の形態では、用紙913上に未定着のトナー像を形成するまでに寄与する部材(例えば図1の901〜908等を含む)を画像形成部とする。   On the intermediate transfer belt 906, yellow, magenta, cyan, and black toner images are superimposed and transferred to form a full-color toner image. Then, the full-color toner image on the intermediate transfer belt 906 passes through the secondary transfer inner roller 907 and the secondary transfer outer roller 908. At that time, a sheet 913 (recording material) fed from the sheet cassette 910 is sandwiched and conveyed between the intermediate transfer belt 906 and the secondary transfer outer roller 908, and a full color toner image on the intermediate transfer belt 906 is transferred. Transferred onto the surface of the sheet 913. In the present exemplary embodiment, members that contribute to the formation of an unfixed toner image on the sheet 913 (for example, including 901 to 908 in FIG. 1) are used as the image forming unit.

二次転写内ローラー907と二次転写外ローラー908のニップ部を通過した用紙913が定着装置としての定着器911に搬送されて高温にされ、トナーが柔らかくなったところで圧力を加えられることで、用紙913の表面に張り付き定着する。その後、トナー像が定着した用紙913は、プリンタ本体900から排紙され積載される。中間転写ベルトクリーナー909は、中間転写ベルト906に残ったトナーを回収する。   The sheet 913 that has passed through the nip portion between the secondary transfer inner roller 907 and the secondary transfer outer roller 908 is conveyed to a fixing device 911 as a fixing device and heated to a high temperature, and pressure is applied when the toner becomes soft, It sticks to the surface of the sheet 913 and is fixed. Thereafter, the sheet 913 on which the toner image is fixed is discharged from the printer main body 900 and stacked. The intermediate transfer belt cleaner 909 collects toner remaining on the intermediate transfer belt 906.

尚、本実施の形態の定着器911は電磁誘導加熱方式であり、磁性材料からなる発熱手段としての定着ローラー92と、後述する電磁誘導コイルとを有し、電磁誘導コイルに高周波電流を流して高周波磁界を発生させる。そして、高周波磁界を定着ローラー92に作用させて定着ローラー92に渦電流を流すことで定着ローラー92を発熱させている。電源装置としての電磁誘導電源100(以下、単に電源100とする)は、定着器911に高周波電流を供給する。   The fixing device 911 according to the present embodiment is an electromagnetic induction heating method, and includes a fixing roller 92 as a heating unit made of a magnetic material and an electromagnetic induction coil to be described later. A high-frequency current is passed through the electromagnetic induction coil. Generate a high-frequency magnetic field. Then, the fixing roller 92 is caused to generate heat by applying an eddy current to the fixing roller 92 by applying a high-frequency magnetic field to the fixing roller 92. An electromagnetic induction power supply 100 (hereinafter simply referred to as a power supply 100) as a power supply device supplies a high-frequency current to the fixing device 911.

(電源、定着器の接続及び電力供給方法)
電源100と定着器911の接続及び電力供給方法を図1(b)のブロック図を用いて説明する。図1(b)に示す電源100は、商用電源500を整流するダイオードブリッジ101と、フィルタコンデンサ102と、共振回路を形成する共振コンデンサ105、106を備える。また、電源100は、第1のスイッチ素子103、第2のスイッチ素子104を備える。また、電源100は、第1のスイッチ素子103を駆動信号121により、また第2のスイッチ素子104を駆動信号122により夫々駆動する駆動回路112を備える。更に、電源100は、制御回路113、入力電流を検出する電流検出回路110、入力電圧を検出する電圧検出回路111、検出手段としてのサーミスタ95を用いて定着ローラー92の表面温度を検出する温度検出回路114を備える。
(Power supply, fixing device connection and power supply method)
A connection between the power source 100 and the fixing device 911 and a power supply method will be described with reference to the block diagram of FIG. A power supply 100 shown in FIG. 1B includes a diode bridge 101 that rectifies a commercial power supply 500, a filter capacitor 102, and resonant capacitors 105 and 106 that form a resonant circuit. The power supply 100 includes a first switch element 103 and a second switch element 104. The power supply 100 also includes a drive circuit 112 that drives the first switch element 103 with a drive signal 121 and the second switch element 104 with a drive signal 122. Further, the power supply 100 uses a control circuit 113, a current detection circuit 110 that detects an input current, a voltage detection circuit 111 that detects an input voltage, and a thermistor 95 as a detection means to detect the surface temperature of the fixing roller 92. A circuit 114 is provided.

定着器911は、定着ローラー92、定着ローラー92の表面温度を検出するサーミスタ95及び複数のコイルを備える。ここで、複数のコイルとは、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2である。定着器911は4つのコネクタ98−1〜98−4を有し、電源100は4つのコネクタ108−1〜108−4を有する。第1の電磁誘導コイル91−1はコネクタ98−1、98−4を、第2の電磁誘導コイル91−2はコネクタ98−2、98−3を経由して、計4本の電線で電源100のコネクタ108−1〜108−4に接続されている。即ち、定着器911のコネクタ98−1は電源100のコネクタ108−1と電線を介して接続し、定着器911のコネクタ98−2は電源100のコネクタ108−2と電線を介して接続する。また、定着器911のコネクタ98−3は電源100のコネクタ108−3と電線を介して接続し、定着器911のコネクタ98−4は電源100のコネクタ108−4と電線を介して接続する。また、図1(b)のコネクタ108−1、108−2又はコネクタ108−3、108−4の図中左側の接続点の黒丸印に示すように、電磁誘導コイル91−1及び91−2は電源100内にて電気的に接続されている。電磁誘導コイル91−1及び91−2に流れる電流比は、電源100から見えるそれぞれのインピーダンス比に相当する。尚、本実施の形態では、電源100から見えるインピーダンス比は、1:1となるように構成している。   The fixing device 911 includes a fixing roller 92, a thermistor 95 that detects the surface temperature of the fixing roller 92, and a plurality of coils. Here, the plurality of coils are the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2. The fixing device 911 has four connectors 98-1 to 98-4, and the power supply 100 has four connectors 108-1 to 108-4. The first electromagnetic induction coil 91-1 is powered by connectors 98-1 and 98-4, and the second electromagnetic induction coil 91-2 is powered by a total of four wires via connectors 98-2 and 98-3. 100 connectors 108-1 to 108-4. That is, the connector 98-1 of the fixing device 911 is connected to the connector 108-1 of the power supply 100 via an electric wire, and the connector 98-2 of the fixing device 911 is connected to the connector 108-2 of the power supply 100 via an electric wire. The connector 98-3 of the fixing device 911 is connected to the connector 108-3 of the power supply 100 via an electric wire, and the connector 98-4 of the fixing device 911 is connected to the connector 108-4 of the power supply 100 via an electric wire. Further, as shown by the black circles at the connection points on the left side of the connectors 108-1 and 108-2 or the connectors 108-3 and 108-4 in FIG. 1B, the electromagnetic induction coils 91-1 and 91-2 are shown. Are electrically connected within the power supply 100. The ratio of the currents flowing through the electromagnetic induction coils 91-1 and 91-2 corresponds to the respective impedance ratios visible from the power supply 100. In this embodiment, the impedance ratio seen from the power supply 100 is configured to be 1: 1.

制御回路113は、電流検出回路110及び電圧検出回路111の検出結果から演算した電力と温度検出回路114の検出結果とに基づいて、駆動回路112が出力する駆動信号121、122のパルス幅tを決定する。第1のスイッチ素子103、第2のスイッチ素子104は、駆動信号121、122に従って交互にオン、オフし、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2に高周波電流を供給する。   The control circuit 113 sets the pulse width t of the drive signals 121 and 122 output from the drive circuit 112 based on the power calculated from the detection results of the current detection circuit 110 and the voltage detection circuit 111 and the detection result of the temperature detection circuit 114. decide. The first switch element 103 and the second switch element 104 are alternately turned on and off according to the drive signals 121 and 122, and the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 are supplied with a high-frequency current. Supply.

(第1の電磁誘導コイル及び第2の電磁誘導コイルの構成)
図2は第1の電磁誘導コイル91−1(図中、黒で示す)及び第2の電磁誘導コイル91−2(図中、グレーで示す)の構成を示した図である。第1の電磁誘導コイル91−1は、例えば線径が0.17mm(以下、φ0.17と記す)のリッツ線84本を撚り合せて成り、両端をコネクタ98−1、98−4に接続している。第2の電磁誘導コイル91−2も同様にφ0.17のリッツ線84本を撚り合せて、両端をコネクタ98−2、98−3に接続している。更に第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2は、分岐点B1及びB2の間で互いに撚り合せるように構成された状態で(図2の分岐点B1近傍の拡大図を参照)、10巻の電磁誘導コイルを形成している。
(Configuration of first electromagnetic induction coil and second electromagnetic induction coil)
FIG. 2 is a diagram showing the configuration of the first electromagnetic induction coil 91-1 (shown in black in the figure) and the second electromagnetic induction coil 91-2 (shown in gray in the figure). The first electromagnetic induction coil 91-1 is formed by twisting 84 litz wires having a wire diameter of 0.17 mm (hereinafter referred to as φ0.17), for example, and both ends are connected to connectors 98-1 and 98-4. doing. Similarly, the second electromagnetic induction coil 91-2 is also twisted 84 litz wires of φ0.17 and both ends are connected to the connectors 98-2 and 98-3. Furthermore, the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 are configured so as to be twisted together between the branch points B1 and B2 (enlargement in the vicinity of the branch point B1 in FIG. 2). 10 windings of electromagnetic induction coils are formed.

撚りの分岐点B1及びB2は、電磁誘導加熱に影響する領域Aの外になるように構成され、電磁誘導加熱に影響する領域Aの範囲内では、第1の電磁誘導コイル91−1と第2の電磁誘導コイル91−2は必ず撚り合せている。即ち、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2により発生する磁界が、定着ローラー92に作用する領域から外れた領域で、互いの撚り合わせを解消する。尚、磁界が定着ローラー92に作用する領域とは、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2により発生する磁界によって、導電性の発熱部材である定着ローラー92に渦電流が流れ、定着ローラー92を発熱させることができる領域である。撚りの分岐後は、第1の電磁誘導コイル91−1はコネクタ98−1、98−4及び電線を経由して、第2の電磁誘導コイル91−2はコネクタ98−2、98−3及び電線を経由して、夫々電源100に接続される。このような構成により、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2は、定着器911内では電気的に絶縁された状態となっている。第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2が電気的に接続されるのは、図1(b)のブロック図を用いて説明したように電源100内である。   The twist branch points B1 and B2 are configured to be outside the region A that affects electromagnetic induction heating, and within the region A that affects electromagnetic induction heating, the first electromagnetic induction coil 91-1 and the first The second electromagnetic induction coil 91-2 is always twisted. That is, the mutual twisting is canceled in a region where the magnetic field generated by the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 is out of the region acting on the fixing roller 92. The region where the magnetic field acts on the fixing roller 92 refers to the fixing roller 92 that is a conductive heat generating member due to the magnetic field generated by the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2. This is an area where eddy current flows and the fixing roller 92 can generate heat. After the twist branching, the first electromagnetic induction coil 91-1 is connected to the connectors 98-1, 98-4 and the electric wires, and the second electromagnetic induction coil 91-2 is connected to the connectors 98-2, 98-3 and 98-2. Each is connected to the power supply 100 via an electric wire. With such a configuration, the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 are electrically insulated in the fixing device 911. The first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 are electrically connected in the power supply 100 as described with reference to the block diagram of FIG.

(定着器の構成)
図3(a)は電磁誘導加熱方式を用いた定着器911の断面構成図である。定着ローラー92は厚さ45μmの導電性発熱体を含み、表面は300μmのゴム層で覆われている。定着ローラー92は駆動ローラー93とニップ部94を形成し、定着ローラー92は駆動ローラー93の回転をニップ部94から伝えられることによって矢印方向に回転する。また、定着ローラー92に対向して第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2がコイルホルダ90内に配置されている。第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2の周囲には、磁性体コア96、97が配置され、磁路を形成している。磁性体コア96はコイルホルダ90に、磁性体コア97はコアホルダ99に保持されている。
(Fixer configuration)
FIG. 3A is a cross-sectional configuration diagram of a fixing device 911 using an electromagnetic induction heating method. The fixing roller 92 includes a conductive heating element having a thickness of 45 μm, and the surface is covered with a rubber layer having a thickness of 300 μm. The fixing roller 92 forms a driving roller 93 and a nip portion 94, and the fixing roller 92 rotates in the direction of the arrow when the rotation of the driving roller 93 is transmitted from the nip portion 94. In addition, a first electromagnetic induction coil 91-1 and a second electromagnetic induction coil 91-2 are arranged in the coil holder 90 so as to face the fixing roller 92. Magnetic cores 96 and 97 are arranged around the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 to form a magnetic path. The magnetic core 96 is held by the coil holder 90 and the magnetic core 97 is held by the core holder 99.

第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2は図2のコイル構成で説明したように、互いに撚り合せるように構成されている。このため、第1の電磁誘導コイル91−1と定着ローラー92との平均距離と第2の電磁誘導コイル91−2と定着ローラー92との平均距離とが略同等となっている。更に第1の電磁誘導コイル91−1と磁性体コア97との平均距離と第2の電磁誘導コイル91−2と磁性体コア97との平均距離とも略同等となっている。そのため、第1の電磁誘導コイル91−1と定着ローラー92との磁気結合の平均強さと第2の電磁誘導コイル91−2と定着ローラー92との磁気結合の平均強さも略同等となる。そして、第1の電磁誘導コイル91−1と磁性体コア97との磁気結合の平均強さと第2の電磁誘導コイル91−2と磁性体コア97との磁気結合の平均強さも略同等となる。   The first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 are configured to be twisted together as described in the coil configuration of FIG. For this reason, the average distance between the first electromagnetic induction coil 91-1 and the fixing roller 92 and the average distance between the second electromagnetic induction coil 91-2 and the fixing roller 92 are substantially equal. Further, the average distance between the first electromagnetic induction coil 91-1 and the magnetic core 97 and the average distance between the second electromagnetic induction coil 91-2 and the magnetic core 97 are substantially equal. Therefore, the average strength of the magnetic coupling between the first electromagnetic induction coil 91-1 and the fixing roller 92 and the average strength of the magnetic coupling between the second electromagnetic induction coil 91-2 and the fixing roller 92 are substantially equal. The average strength of the magnetic coupling between the first electromagnetic induction coil 91-1 and the magnetic core 97 and the average strength of the magnetic coupling between the second electromagnetic induction coil 91-2 and the magnetic core 97 are substantially equal. .

これにより、電源100から見えるインピーダンスも略同等となり、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2に流れる電流を夫々I1、I2とすると、電流I1、I2も図3(b)で示すように略同等となる。電流I1、I2のピーク電流値は、電源100から供給される電流(I1+I2)のピーク電流値Ipの1/2となっている。ここで、図3(b)は、上から、電源100から供給される電流(I1+I2)の波形、第1の電磁誘導コイル91−1に流れる電流の波形、第2の電磁誘導コイル91−2に流れる電流の波形である。第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2に交流電流を流して磁場を発生させることで、定着ローラー92の導電性発熱体が自己発熱する。サーミスタ95は定着ローラー92の発熱部に内側から当接しており、その温度を検出している。   As a result, the impedances visible from the power supply 100 are also substantially equal. If the currents flowing through the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 are I1 and I2, respectively, the currents I1 and I2 are also shown in FIG. As shown in FIG. The peak current values of the currents I1 and I2 are ½ of the peak current value Ip of the current (I1 + I2) supplied from the power supply 100. Here, FIG. 3B shows, from the top, the waveform of the current (I1 + I2) supplied from the power source 100, the waveform of the current flowing through the first electromagnetic induction coil 91-1, and the second electromagnetic induction coil 91-2. It is the waveform of the electric current which flows into. By causing an alternating current to flow through the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 to generate a magnetic field, the conductive heating element of the fixing roller 92 self-heats. The thermistor 95 is in contact with the heat generating portion of the fixing roller 92 from the inside, and detects the temperature.

(画像形成処理)
図4は画像形成処理のフローチャートである。図4を用いて基本的な画像形成のフローを説明する。画像形成が開始されると、ステップ(以下、Sとする)1001で、コントローラ200は、定着ローラー92の回転を開始させ、S1002で電源100の制御回路113により定着の温度制御を開始する。尚、コントローラ200は、予め不図示のメモリ等に保持している定着の目標とする温度Toを、制御回路113に設定する。S1003でコントローラ200は、制御回路113によって、サーミスタ95により温度検出回路114が検出した温度T(以下、検出温度Tとする)が、目標とする温度To(例えば180℃)(以下、目標温度Toとする)に達したか否かを判断する。S1003でコントローラ200は、検出温度Tが目標温度Toに達していないと判断した場合、S1003の処理を繰り返す。
(Image formation processing)
FIG. 4 is a flowchart of the image forming process. A basic image forming flow will be described with reference to FIG. When image formation is started, the controller 200 starts rotation of the fixing roller 92 in step (hereinafter, referred to as S) 1001 and starts fixing temperature control by the control circuit 113 of the power supply 100 in S1002. The controller 200 sets, in the control circuit 113, a fixing target temperature To previously held in a memory (not shown) or the like. In S1003, the controller 200 detects that the temperature T detected by the temperature detection circuit 114 by the thermistor 95 (hereinafter referred to as the detected temperature T) is the target temperature To (for example, 180 ° C.) (hereinafter referred to as the target temperature To). It is determined whether or not When the controller 200 determines in S1003 that the detected temperature T has not reached the target temperature To, the process of S1003 is repeated.

S1003でコントローラ200は、検出温度Tが目標温度Toに達したと判断した場合、S1004の処理に進む。尚、コントローラ200が、制御回路113にS1002で温度制御を開始させてから、後述するS1013で温度制御を終了させるまで、定着ローラー92の温度を目標温度Toに保つために、制御回路113は後述する図5の温度制御を行う。S1004でコントローラ200は、感光ドラム901やその他の駆動部材(図中、駆動と記す)を回転させ、S1005で一次帯電ローラー902により感光ドラム901表面を正極に均一帯電する。S1006でコントローラ200は、均一帯電された感光ドラム901表面にレーザーユニット903によりレーザーを照射し、潜像を形成する。S1007でコントローラ200は、現像スリーブ904によって潜像を現像し感光ドラム901上にトナー像を形成する。S1008でコントローラ200は、感光ドラム901上のトナー像を一次転写ローラー905により中間転写ベルト906に転写する。S1009でコントローラ200は、用紙カセット910から所定のタイミングで用紙913を給紙する。S1010でコントローラ200は、中間転写ベルト906上のトナー像をS1009で給紙された用紙913に二次転写外ローラー908により転写する。   If the controller 200 determines in S1003 that the detected temperature T has reached the target temperature To, the process proceeds to S1004. In order to keep the temperature of the fixing roller 92 at the target temperature To from when the controller 200 causes the control circuit 113 to start the temperature control in S1002, until the temperature control is ended in S1013 described later, the control circuit 113 is described later. The temperature control in FIG. 5 is performed. In S1004, the controller 200 rotates the photosensitive drum 901 and other driving members (referred to as driving in the drawing), and in S1005, the surface of the photosensitive drum 901 is uniformly charged to the positive electrode by the primary charging roller 902. In step S <b> 1006, the controller 200 irradiates the uniformly charged surface of the photosensitive drum 901 with a laser by the laser unit 903 to form a latent image. In step S <b> 1007, the controller 200 develops the latent image with the developing sleeve 904 and forms a toner image on the photosensitive drum 901. In step S <b> 1008, the controller 200 transfers the toner image on the photosensitive drum 901 to the intermediate transfer belt 906 by the primary transfer roller 905. In step S1009, the controller 200 feeds the sheet 913 from the sheet cassette 910 at a predetermined timing. In S1010, the controller 200 transfers the toner image on the intermediate transfer belt 906 to the paper 913 fed in S1009 by the secondary transfer outer roller 908.

S1011でコントローラ200は、トナー像が形成された用紙913を定着器911に搬送し、定着器911により定着し、S1012で排紙する。S1012の排紙までの処理が終了すると、S1013の処理に進む。S1013でコントローラ200は、制御回路113による定着器911の温度制御を終了し、S1014で定着ローラー92の回転を停止させ、S1015で感光ドラム901やその他の駆動部材の回転を停止して画像形成処理を終了する。このように画像形成中は、制御回路113により定着器911の温度を所定の温度(目標温度)に保つように、電源100から定着器911に電力を供給し続けている。   In step S1011, the controller 200 conveys the sheet 913 on which the toner image is formed to the fixing unit 911, fixes the sheet 913 by the fixing unit 911, and discharges the sheet in step S1012. When the process up to the paper discharge in S1012 is completed, the process proceeds to S1013. In S1013, the controller 200 ends the temperature control of the fixing device 911 by the control circuit 113, stops the rotation of the fixing roller 92 in S1014, stops the rotation of the photosensitive drum 901 and other driving members in S1015, and performs image forming processing. Exit. In this way, during image formation, the control circuit 113 continues to supply power from the power supply 100 to the fixing device 911 so that the temperature of the fixing device 911 is maintained at a predetermined temperature (target temperature).

(定着器の温度制御)
図4のS1002でコントローラ200が制御回路113に温度制御を開始させて、S1013で温度制御を終了させるまでの、画像形成中における定着器911の温度制御方法を図5のフローチャートを用いて説明する。図4のS1002で制御回路113がコントローラ200から温度制御の開始の指示を受けると、S2001で制御回路113は、電流検出回路110により検出した電流値と電圧検出回路111により検出した電圧値とから現在の電力Pを算出する。そして制御回路113は、算出した現在の電力Pと上限電力Pmaxを比較し、現在の電力Pが上限電力Pmaxより大きいか否かを判断する。S2001で制御回路113は、現在の電力Pが上限電力Pmax以下であると判断した場合、S2002の処理に進む。S2002で制御回路113は、温度検出回路114がサーミスタ95により検出した定着ローラー92の検出温度Tと目標温度To(例えば180℃)を比較し、検出温度Tが目標温度Toより高いか否かを判断する。S2002で制御回路113は、検出温度Tが目標温度To以下であると判断した場合、S2003で検出温度Tが目標温度Toより低いか否かを判断する。S2003で制御回路113は、検出温度Tが目標温度Toより低くないと判断した場合、S2004で検出温度Tは目標温度Toと等しい(T=To)と判断する。そして、制御回路113は、駆動回路112が出力する駆動信号121又は122のパルス幅tを変化させることなく(t=t)、S2005の処理に進む。
(Fixer temperature control)
A temperature control method of the fixing device 911 during image formation from when the controller 200 starts temperature control to the control circuit 113 at S1002 in FIG. . When the control circuit 113 receives an instruction to start temperature control from the controller 200 in S1002 of FIG. 4, the control circuit 113 in S2001 uses the current value detected by the current detection circuit 110 and the voltage value detected by the voltage detection circuit 111. The current power P is calculated. Then, the control circuit 113 compares the calculated current power P and the upper limit power Pmax, and determines whether or not the current power P is larger than the upper limit power Pmax. If the control circuit 113 determines in S2001 that the current power P is less than or equal to the upper limit power Pmax, the process proceeds to S2002. In S2002, the control circuit 113 compares the detection temperature T of the fixing roller 92 detected by the thermistor 95 with the temperature detection circuit 114 and a target temperature To (for example, 180 ° C.), and determines whether the detection temperature T is higher than the target temperature To. to decide. If the control circuit 113 determines that the detected temperature T is equal to or lower than the target temperature To in S2002, the control circuit 113 determines whether or not the detected temperature T is lower than the target temperature To in S2003. If the control circuit 113 determines in step S2003 that the detected temperature T is not lower than the target temperature To, it determines in step S2004 that the detected temperature T is equal to the target temperature To (T = To). Then, the control circuit 113 proceeds to the process of S2005 without changing the pulse width t of the drive signal 121 or 122 output from the drive circuit 112 (t = t).

一方、S2001で制御回路113は、現在の電力Pが上限電力Pmaxより大きい(P>Pmax)と判断した場合、S2009の処理に進む。また、S2002で制御回路113は、検出温度Tが目標温度Toより高い(T>To)と判断した場合もS2009の処理に進む。S2009で制御回路113は、駆動回路112が出力する駆動信号121又は122のパルス幅tを所定の値taだけ小さくしたパルス幅(t−ta)が、駆動信号121、122の最小パルス幅tmin以下となるか否かを判断する。S2009で制御回路113は、パルス幅t−taが最小パルス幅tmin以下にならないと判断した場合は、S2010で駆動信号121、122のパルス幅tをtaだけ小さくしパルス幅tをt−taとする(t=t−ta)。一方、S2009で制御回路113は、パルス幅t−taが最小パルス幅tmin以下になると判断した場合は、S2011の処理に進む。S2011で制御回路113は、駆動信号121、122のパルス幅tを0にし(t=0)、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2に電流を供給しないようにする。   On the other hand, if the control circuit 113 determines in S2001 that the current power P is greater than the upper limit power Pmax (P> Pmax), the process proceeds to S2009. In S2002, the control circuit 113 also proceeds to the processing of S2009 when determining that the detected temperature T is higher than the target temperature To (T> To). In step S2009, the control circuit 113 determines that the pulse width (t-ta) obtained by reducing the pulse width t of the drive signal 121 or 122 output from the drive circuit 112 by a predetermined value ta is equal to or smaller than the minimum pulse width tmin of the drive signals 121 and 122. It is determined whether or not. If the control circuit 113 determines in S2009 that the pulse width t-ta is not equal to or smaller than the minimum pulse width tmin, the pulse width t of the drive signals 121 and 122 is decreased by ta in S2010, and the pulse width t is set to t-ta. (T = t−ta). On the other hand, if the control circuit 113 determines in S2009 that the pulse width t-ta is equal to or smaller than the minimum pulse width tmin, the process proceeds to S2011. In S2011, the control circuit 113 sets the pulse width t of the drive signals 121 and 122 to 0 (t = 0) so that no current is supplied to the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2. To.

S2003で制御回路113は、検出温度Tが目標温度To未満である(T<To)と判断した場合はS2006の処理に進む。S2006で制御回路113は、駆動回路112が出力する駆動信号121、122のパルス幅tを所定の値tbだけ大きくしたパルス幅(t+tb)が、駆動信号121、122の最大パルス幅tmax以上となるか否かを判断する。S2006で制御回路113は、パルス幅t+tbが最大パルス幅tmax以上にはならないと判断した場合は、S2007で駆動信号121、122のパルス幅をtbだけ大きくしパルス幅tをt+tbとする(t=t+tb)。一方、S2006で制御回路113は、パルス幅t+tbが最大パルス幅tmax以上になると判断した場合は、S2008で駆動信号121、122のパルス幅tをtmaxにする(t=tmax)。尚、上限電力Pmaxや所定の値ta、tb、最小パルス幅tmin、最大パルス幅tmaxの値は、例えば制御回路113が有する不図示のメモリ等に予め保持しておく。尚、これらの値を、コントローラ200が有する不図示のメモリ等に予め保持しておき、制御回路113に設定する構成としてもよい。   If the control circuit 113 determines in step S2003 that the detected temperature T is lower than the target temperature To (T <To), the process proceeds to step S2006. In S2006, the control circuit 113 increases the pulse width (t + tb), which is obtained by increasing the pulse width t of the drive signals 121 and 122 output from the drive circuit 112 by a predetermined value tb, to be equal to or greater than the maximum pulse width tmax of the drive signals 121 and 122. Determine whether or not. If the control circuit 113 determines in S2006 that the pulse width t + tb is not equal to or greater than the maximum pulse width tmax, the pulse width of the drive signals 121 and 122 is increased by tb in S2007, and the pulse width t is set to t + tb (t = tb). t + tb). On the other hand, if the control circuit 113 determines in S2006 that the pulse width t + tb is equal to or greater than the maximum pulse width tmax, the control circuit 113 sets the pulse width t of the drive signals 121 and 122 to tmax in S2008 (t = tmax). The upper limit power Pmax, the predetermined values ta and tb, the minimum pulse width tmin, and the maximum pulse width tmax are stored in advance in a memory (not shown) included in the control circuit 113, for example. These values may be stored in advance in a memory (not shown) of the controller 200 and set in the control circuit 113.

このように、制御回路113は、駆動回路112が出力する駆動信号121、122のパルス幅tを増減させることで、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2に流す高周波電流を増減させ、定着ローラー92の温度を制御する。尚、制御回路113は、合成インピーダンスが最小となる共振周波数よりも高い周波数領域で、第1のスイッチ素子103及び第2のスイッチ素子104の駆動周波数を制御する。ここで、合成インピーダンスは、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2と、共振コンデンサ105、106の合成インピーダンスである。駆動回路112が出力する駆動信号121、122のパルス幅tを小さくすると、第1のスイッチ素子103及び第2のスイッチ素子104の駆動周波数が高くなる。これにより、合成インピーダンスが高くなって電流が流れにくくなり、供給される電力が小さくなって、定着ローラー92の温度を下げることができる。また、駆動信号121、122のパルス幅tを大きくすると、第1のスイッチ素子103及び第2のスイッチ素子104の駆動周波数が低くなる。これにより、合成インピーダンスが低くなって電流が流れやすくなり、供給される電力が大きくなって、定着ローラー92の温度を上げることができる。制御回路113は、この温度制御を用紙913が排紙されるまで継続する。   As described above, the control circuit 113 increases or decreases the pulse width t of the drive signals 121 and 122 output from the drive circuit 112, thereby causing the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 to increase and decrease. The temperature of the fixing roller 92 is controlled by increasing / decreasing the flowing high-frequency current. The control circuit 113 controls the drive frequency of the first switch element 103 and the second switch element 104 in a frequency region higher than the resonance frequency at which the combined impedance is minimized. Here, the combined impedance is the combined impedance of the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 and the resonant capacitors 105 and 106. When the pulse width t of the drive signals 121 and 122 output from the drive circuit 112 is reduced, the drive frequencies of the first switch element 103 and the second switch element 104 are increased. As a result, the combined impedance becomes high and current does not easily flow, and the supplied power is reduced, so that the temperature of the fixing roller 92 can be lowered. Further, when the pulse width t of the drive signals 121 and 122 is increased, the drive frequency of the first switch element 103 and the second switch element 104 is lowered. As a result, the combined impedance becomes low and current flows easily, and the supplied electric power increases, so that the temperature of the fixing roller 92 can be raised. The control circuit 113 continues this temperature control until the sheet 913 is discharged.

以上説明したように、本実施の形態では、複数の電磁誘導コイルを撚り合せ、各電磁誘導コイルと定着ローラー及び磁性体コアとの平均距離を略同等にし、それぞれの電磁誘導コイルに対して別々のコネクタピンを介して電源から高周波電流を供給している。そのため大電流用コネクタも接続端子も用いずに各電磁誘導コイルに対して略均等な電流に分割して供給できるようになり、配線スペースを縮小することができる。   As described above, in the present embodiment, a plurality of electromagnetic induction coils are twisted so that the average distances between the electromagnetic induction coils, the fixing roller, and the magnetic core are substantially equal, and each electromagnetic induction coil is separately provided. The high frequency current is supplied from the power source through the connector pins. Therefore, it becomes possible to divide and supply substantially equal current to each electromagnetic induction coil without using a large current connector and connection terminals, and the wiring space can be reduced.

[その他の実施の形態]
・本発明が適用される画像形成装置は、図1(a)で説明した画像形成装置に限定されるものではなく、例えばモノクロプリンタや中間転写ベルトを用いない方式等、電磁誘導加熱方式の定着器を備える画像形成装置であればよい。
・上述した実施の形態では、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2が、定着ローラー92に沿って曲面となるような構成である(図3(a)参照)。しかし、定着装置が例えば特許文献1等のような定着ベルトを有する構成であり、第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2が平面となるような構成にも適用できる。即ち、本発明は、定着装置が電磁誘導加熱方式のものであれば、適用可能である。
・上述した実施の形態では、定着器911は第1の電磁誘導コイル91−1及び第2の電磁誘導コイル91−2の2本を有する構成とした。しかし、例えば第1乃至第3の電磁誘導コイルの3本を有し、コネクタ6つを有する構成であってもよいし、第1乃至第4の電磁誘導コイルの4本を有し、コネクタ8つを有する構成であってもよい。電磁誘導コイルの本数については、1つの電磁誘導コイルに流れる電流値を小さくするためには電磁誘導コイルの本数が多い方がよいが、コスト面から必要なコネクタ数は少ない方がよいため、これらを勘案して決定される。尚、本発明では、複数の電磁誘導コイルを互いに撚り合せて構成している。このため、複数の電磁誘導コイルの夫々と定着ローラー92との磁気結合の平均強さ、及び、各電磁誘導コイルと磁性体コア97との磁気結合の平均強さも略同等となる。
以上、その他の実施の形態においても、大電流用コネクタも接続端子も用いずに各電磁誘導コイルに対して略均等な電流に分割して供給できるようになり、配線スペースを縮小することができる。
[Other embodiments]
The image forming apparatus to which the present invention is applied is not limited to the image forming apparatus described with reference to FIG. 1A. For example, fixing using an electromagnetic induction heating method such as a method that does not use a monochrome printer or an intermediate transfer belt. Any image forming apparatus provided with a container may be used.
In the above-described embodiment, the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 are configured to be curved along the fixing roller 92 (see FIG. 3A). ). However, the fixing device has a fixing belt as disclosed in Patent Document 1, for example, and is also applied to a configuration in which the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2 are flat. it can. That is, the present invention is applicable if the fixing device is of an electromagnetic induction heating type.
In the above-described embodiment, the fixing device 911 includes the first electromagnetic induction coil 91-1 and the second electromagnetic induction coil 91-2. However, for example, there may be a configuration having three of the first to third electromagnetic induction coils and six connectors, or four of the first to fourth electromagnetic induction coils, and the connector 8. The structure which has one may be sufficient. With regard to the number of electromagnetic induction coils, it is better to increase the number of electromagnetic induction coils in order to reduce the current value flowing through one electromagnetic induction coil. To be determined. In the present invention, a plurality of electromagnetic induction coils are twisted together. For this reason, the average strength of the magnetic coupling between each of the plurality of electromagnetic induction coils and the fixing roller 92 and the average strength of the magnetic coupling between each electromagnetic induction coil and the magnetic core 97 are substantially equal.
As described above, also in the other embodiments, it becomes possible to divide and supply substantially equal current to each electromagnetic induction coil without using a large current connector and connection terminals, and the wiring space can be reduced. .

91−1 第1の電磁誘導コイル
91−2 第2の電磁誘導コイル
92 定着ローラー
113 制御回路
114 温度検出回路
91-1 first electromagnetic induction coil 91-2 second electromagnetic induction coil 92 fixing roller 113 control circuit 114 temperature detection circuit

Claims (5)

電磁誘導加熱方式の定着装置において、
高周波の電流を供給する供給手段と、
前記供給手段から電流を供給され、磁界を発生する複数のコイルと、
前記複数のコイルが発生する磁界の作用により発熱する発熱手段と、
前記発熱手段の温度を検出する検出手段と、
前記検出手段により検出した前記発熱手段の温度に基づいて前記複数のコイルに供給する電流を制御する制御手段と、
を備え、
前記複数のコイルは、互いに撚り合わせられ、前記複数のコイルの夫々のコイルと前記発熱手段との平均距離が等しくなるように配置されることを特徴とする定着装置。
In the electromagnetic induction heating type fixing device,
Supply means for supplying high-frequency current;
A plurality of coils which are supplied with current from the supply means and generate a magnetic field;
Heating means for generating heat by the action of a magnetic field generated by the plurality of coils;
Detecting means for detecting the temperature of the heat generating means;
Control means for controlling the current supplied to the plurality of coils based on the temperature of the heat generating means detected by the detecting means;
With
The fixing device is characterized in that the plurality of coils are twisted together and arranged so that the average distance between each of the plurality of coils and the heat generating means is equal.
前記複数のコイルは、発生する磁界が前記発熱手段に作用する領域から外れた領域で、互いの撚り合わせを解消す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 plurality of coils cancel each other's twisting in a region where a generated magnetic field deviates from a region where the magnetic field acts on the heat generating unit. 前記磁界が前記発熱手段に作用する領域とは、前記複数のコイルが発生する磁界によって、前記発熱手段を発熱させることができる領域であることを特徴とする請求項2に記載の定着装置。   The fixing device according to claim 2, wherein the region where the magnetic field acts on the heat generating unit is a region where the heat generating unit can generate heat by the magnetic field generated by the plurality of coils. 前記発熱手段は、導電性の発熱部材であることを特徴とする請求項1乃至3のいずれか1項に記載の定着装置。   The fixing device according to claim 1, wherein the heat generating unit is a conductive heat generating member. 記録材に画像を形成する画像形成手段と、
前記画像形成手段により形成された画像を記録材に定着させる請求項1乃至4のいずれか1項に記載の定着装置と、
を備えることを特徴とする画像形成装置。
Image forming means for forming an image on a recording material;
The fixing device according to any one of claims 1 to 4, wherein an image formed by the image forming unit is fixed to a recording material.
An image forming apparatus comprising:
JP2012192102A 2012-08-31 2012-08-31 Fixing device and image forming device Pending JP2014048513A (en)

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