【特許請求の範囲】
【請求項１】 薄肉のベルトと、
前記ベルトに圧接して前記ベルトの表面側にニップを形成する加圧手段と、
少なくとも一部は導電性部材でなり前記ベルトを移動可能に懸架する発熱ローラと、
前記発熱ローラの外部から前記発熱ローラを励磁する励磁コイルとを有し、
前記発熱ローラの導電性部材は、その材質と励磁される際の周波数とで定まる表皮深さ以上の厚さを有することを特徴とする像加熱装置。
【請求項２】 薄肉のベルトと、
前記ベルトに圧接して前記ベルトの表面側にニップを形成する加圧手段と、
キュリー温度を所定の値に設定した高透磁性を有する部材でなり前記ベルトを移動可能に懸架する発熱ローラと、
前記発熱ローラ内に設置した導電性部材と、
前記発熱ローラの外部から前記発熱ローラを励磁する励磁コイルと
を有することを特徴とする像加熱装置。
【請求項３】 温度を検知する温度検出手段と、
前記温度検出手段の出力に応じて前記励磁コイルの出力を制御する制御手段と
を有する請求項２記載の像加熱装置。
【請求項４】 前記導電性部材を、前記発熱ローラとは断熱的に設置した請求項２ないし３のいずれかに記載の像加熱装置。
【請求項５】 薄肉のベルトと、
前記ベルトに圧接して前記ベルトの表面側にニップを形成する加圧手段と、
キュリー温度を所定の値に設定した高透磁性を有する部材でなり前記ベルトを移動可能に懸架する発熱ローラと、
前記発熱ローラ内に設置した導電性部材と、
前記発熱ローラの外部から前記発熱ローラを励磁する励磁コイルと、
温度を検知する温度検出手段とを有し、
定着温度は、前記温度検出手段の出力に応じ、前記励磁コイルの出力を制御することにより温度制御され、
前記高透磁性部材のキュリー温度は、前記高透磁性部材のキュリー温度により定まる前記発熱ローラの自己温度制御が前記定着温度よりも高い温度で行われるように設定され、
前記自己温度制御は、前記発熱ローラの異常昇温の防止のために用いられる
ことを特徴とする像加熱装置。
【請求項６】 前記発熱ローラの前記高透磁性部材の厚さを、その材質と励磁周波数とで定まる表皮深さ以上に設定した請求項２ないし５のいずれかに記載の像加熱装置。
【請求項７】 前記薄肉のベルトは、基材が樹脂でなり表面に離型層を積層したベルトである請求項１ないし６のいずれかに記載の像加熱装置。
【請求項８】 被記録材に未定着画像を形成担持させる画像形成手段と、
前記未定着画像を前記被記録材に熱定着させる熱定着装置とを有する画像形成装置であって、
前記熱定着装置は、請求項１ないし７のいずれかに記載の像加熱装置であることを特徴とする画像形成装置。
[Claims]
1. A thin belt and
A pressurizing means that presses against the belt to form a nip on the surface side of the belt, and
At least part of it is a heat-generating roller that is made of a conductive member and suspends the belt so that it can be moved.
From the outside of the heating rollerExcite the heating rollerHas an exciting coil and
SaidThe conductive member of the heating roller is made of the same material.Frequency when excitedAn image heating device having a thickness equal to or greater than the skin depth determined by.
2. A thin belt and
A pressurizing means that presses against the belt to form a nip on the surface side of the belt, and
A heat-generating roller made of a member having high magnetic permeability with the Curie temperature set to a predetermined value and suspending the belt so as to be movable.
The conductive member installed in the heating roller and
With an exciting coil that excites the heating roller from the outside of the heating roller
An image heating device characterized by having.
3. Temperature detection means to detect temperature and
With a control means that controls the output of the exciting coil according to the output of the temperature detecting means
2. The image heating device according to claim 2.
4. SaidThe conductive member was installed adiabatically with the heat generating roller.In any of claims 2 to 3The image heating device according to the description.
5. With a thin belt,
A pressurizing means that presses against the belt to form a nip on the surface side of the belt,
A heat-generating roller made of a member having high magnetic permeability with the Curie temperature set to a predetermined value and suspending the belt so as to be movable.
The conductive member installed in the heating roller and
An exciting coil that excites the heating roller from the outside of the heating roller,
It has a temperature detecting means for detecting the temperature,
The fixing temperature is temperature-controlled by controlling the output of the exciting coil according to the output of the temperature detecting means.
The Curie temperature of the highly permeable magnetic member is set so that the self-temperature control of the heat generating roller, which is determined by the Curie temperature of the highly permeable magnetic member, is performed at a temperature higher than the fixing temperature.
The self-temperature control is used to prevent an abnormal temperature rise of the heating roller.
An image heating device characterized in that.
6. SaidOf the heating rollerSaidThe thickness of the highly permeable magnetic member is set to be greater than or equal to the skin depth determined by the material and excitation frequency.In any of claims 2 to 5The image heating device according to the description.
7. SaidA thin-walled belt is a belt in which the base material is made of resin and a release layer is laminated on the surface.Any of claims 1 to 6The image heating device according to the description.
8. An image forming means for forming and supporting an unfixed image on a recording material,
SaidUnfixed imageSaidAn image forming apparatus having a heat fixing device for heat fixing to a material to be recorded.
SaidThe heat fixing device isIn any of claims 1 to 7.An image forming apparatus according to the above-described image heating apparatus.
【００１２】
【課題を解決するための手段】
上記課題を解決するために、本発明は、薄肉のベルトと、前記ベルトに圧接して前記ベルトの表面側にニップを形成する加圧手段と、少なくとも一部は導電性部材でなり前記ベルトを移動可能に懸架する発熱ローラと、前記発熱ローラの外部から前記発熱ローラを励磁する励磁コイルとを有し、前記発熱ローラの導電性部材は、その材質と励磁される際の周波数とで定まる表皮深さ以上の厚さを有することを特徴とする像加熱装置と、これを用いた画像形成装置である。
0012
[Means for solving problems]
In order to solve the above problems, the present invention comprises a thin-walled belt, a pressurizing means that presses against the belt to form a nip on the surface side of the belt, and at least a part of the belt is made of a conductive member. It has a heat-generating roller that is movably suspended and an exciting coil that excites the heat-generating roller from the outside of the heat-generating roller, and the conductive member of the heat-generating roller is a skin determined by its material and the frequency at which it is excited. An image heating device characterized by having a thickness equal to or greater than the depth , and an image forming device using the image heating device.
また本発明は、薄肉のベルトと、前記ベルトに圧接して前記ベルトの表面側にニップを形成する加圧手段と、キュリー温度を所定の値に設定した高透磁性を有する部材でなり前記ベルトを移動可能に懸架する発熱ローラと、前記発熱ローラ内に設置した導電性部材と、前記発熱ローラの外部から前記発熱ローラを励磁する励磁コイルとを有することを特徴とする像加熱装置と、これを用いた画像形成装置である。
The present invention also comprises a thin-walled belt, a pressurizing means that presses against the belt to form a nip on the surface side of the belt, and a member having high magnetic permeability in which the Curie temperature is set to a predetermined value. An image heating device characterized by having a heat-generating roller that movably suspends the heat-generating roller, a conductive member installed in the heat-generating roller, and an exciting coil that excites the heat-generating roller from the outside of the heat-generating roller. It is an image forming apparatus using.
また本発明は、薄肉のベルトと、前記ベルトに圧接して前記ベルトの表面側にニップを形成する加圧手段と、キュリー温度を所定の値に設定した高透磁性を有する部材でなり前記ベルトを移動可能に懸架する発熱ローラと、前記発熱ローラ内に設置した導電性部材と、前記発熱ローラの外部から前記発熱ローラを励磁する励磁コイルと、温度を検知する温度検出手段とを有し、定着温度は、前記温度検出手段の出力に応じ、前記励磁コイルの出力を制御することにより温度制御され、前記高透磁性部材のキュリー温度は、前記高透磁性部材のキュリー温度により定まる前記発熱ローラの自己温度制御が前記定着温度よりも高い温度で行われるように設定され、前記自己温度制御は、前記発熱ローラの異常昇温の防止のために用いられることを特徴とする像加熱装置と、これを用いた画像形成装置である。
Further, the present invention comprises a thin-walled belt, a pressurizing means for forming a nip on the surface side of the belt by pressure contact with the belt, and a member having high permeable magnetism in which the Curie temperature is set to a predetermined value. It has a heating roller that movably suspends the heating roller, a conductive member installed in the heating roller, an exciting coil that excites the heating roller from the outside of the heating roller, and a temperature detecting means for detecting the temperature. The fixing temperature is temperature-controlled by controlling the output of the exciting coil according to the output of the temperature detecting means, and the Curie temperature of the highly permeable magnetic member is determined by the Curie temperature of the highly permeable magnetic member. The self-temperature control is set to be performed at a temperature higher than the fixing temperature, and the self-temperature control is used for preventing an abnormal temperature rise of the heating roller . It is an image forming apparatus using this.