JP2002318160A - Temperature measuring device and fixing device - Google Patents
Temperature measuring device and fixing deviceInfo
- Publication number
- JP2002318160A JP2002318160A JP2001122692A JP2001122692A JP2002318160A JP 2002318160 A JP2002318160 A JP 2002318160A JP 2001122692 A JP2001122692 A JP 2001122692A JP 2001122692 A JP2001122692 A JP 2001122692A JP 2002318160 A JP2002318160 A JP 2002318160A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- shielding plate
- detecting means
- fixing
- temperature detecting
- 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.)
- Withdrawn
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 238000012937 correction Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 238000009529 body temperature measurement Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000012546 transfer Methods 0.000 description 34
- 238000006243 chemical reaction Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000006096 absorbing agent Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical class [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Radiation Pyrometers (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、被測定物と非接触
状態で表面の温度を測定する温度測定装置、及びこのよ
うな非接触式の温度測定装置を備え、未定着トナー像を
加熱・加圧して記録媒体上に定着する定着装置に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device for measuring a surface temperature in a non-contact state with an object to be measured and a non-contact type temperature measuring device for heating an unfixed toner image. The present invention relates to a fixing device for fixing a recording medium by applying pressure.
【０００２】[0002]
【従来の技術】一般に、粉状のトナーを用いる画像形成
装置において、形成されたトナー像を記録媒体に定着す
る工程は、トナー像を記録媒体上に静電的に転写した
後、定着装置によってトナー像を加熱加圧して記録媒体
上に融着する方法が広く採用されている。定着装置とし
ては、加熱された定着ロールに加圧部材が圧接されてい
るものや、無端状の定着ベルトを加熱し、この定着ベル
トに加圧部材が圧接されているものが一般に用いられて
いる。また、トナー像を一旦中間転写体に転写した後、
該中間転写体上でトナーを溶融し、これを記録媒体に圧
着することにより、転写と定着とを同時に行う定着装置
も知られている。2. Description of the Related Art Generally, in an image forming apparatus using a powdery toner, a step of fixing a formed toner image on a recording medium is performed by electrostatically transferring the toner image onto the recording medium, and then, by a fixing device. A method of heating and pressing a toner image to fuse it on a recording medium has been widely adopted. As a fixing device, a fixing device in which a pressing member is pressed against a heated fixing roll, or a fixing device in which an endless fixing belt is heated and a pressing member is pressed against the fixing belt, are generally used. . Also, once the toner image is transferred to the intermediate transfer member,
There is also known a fixing device in which the toner is melted on the intermediate transfer member and the toner is pressed against a recording medium to thereby simultaneously perform the transfer and the fixing.
【０００３】このようなトナー像の記録媒体への定着で
は、トナー像を適切な温度で加熱溶融することが必要と
される。トナー像の加熱温度が高過ぎるとトナー像が記
録媒体上で冷却固化しにくくなり、定着ロールや定着ベ
ルト等の定着部材、又は中間転写体にトナーがオフセッ
トしてしまうおそれがある。また、加熱温度が低いとト
ナー像の加熱が不十分となり、記録媒体へ良好に定着さ
れないおそれがある。In fixing such a toner image to a recording medium, it is necessary to heat and fuse the toner image at an appropriate temperature. If the heating temperature of the toner image is too high, the toner image is difficult to be cooled and solidified on the recording medium, and the toner may be offset to a fixing member such as a fixing roll or a fixing belt or an intermediate transfer member. On the other hand, when the heating temperature is low, the heating of the toner image becomes insufficient, and there is a possibility that the toner image is not fixed well on the recording medium.
【０００４】このため、上記のような定着装置又は転写
と定着とを同時に行う画像形成装置において、定着部材
又は中間転写体の温度を最適な状態に維持するように、
該定着部材又は中間転写体の温度制御が行われる。この
温度制御のために、定着部材又は中間転写体の温度を測
定する手段としては、特開平4-81877号公報、特開平5-2
349号公報、特開平8-63036号公報等に記載されているよ
うに、主にサーミスタが用いられている。該サーミスタ
は、被測定物に接触して温度を測定する温度測定手段で
あり、定着部材又は中間転写体の表面にサーミスタの温
度検知面を接触させ温度を検出する。For this reason, in the above-described fixing device or an image forming apparatus that simultaneously performs transfer and fixing, the temperature of the fixing member or the intermediate transfer member is maintained in an optimum state.
The temperature of the fixing member or the intermediate transfer member is controlled. Means for measuring the temperature of the fixing member or the intermediate transfer member for this temperature control are disclosed in JP-A-4-81877 and JP-A-5-2877.
As described in JP-A-349, JP-A-8-63036 and the like, a thermistor is mainly used. The thermistor is a temperature measuring unit that measures the temperature by contacting the object to be measured, and detects the temperature by bringing the temperature detecting surface of the thermistor into contact with the surface of the fixing member or the intermediate transfer body.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記サ
ーミスタを用いた温度測定には、次のような問題点があ
る。定着部材の画像形成部にサーミスタを接触させる
と、検出された温度はトナー像及び記録媒体と直接に接
触する部分における温度であるため、正確な定着温度の
制御を行うことができる。しかし、定着部材の表面に付
着したオフセットトナーが該サーミスタの温度検知面に
付着し、温度測定の精度が低下するおそれがある。ま
た、サーミスタが接触することにより、回転駆動する定
着部材又は中間転写体の表面に傷がつくおそれがあり、
この傷が定着不良の原因となる。一方、定着部材又は中
間転写体の非画像形成部、つまり周面の側縁部にサーミ
スタを接触させて温度測定を行うとこれらの問題は生じ
ないが、測定部位がトナー像及び記録媒体に圧接される
部分ではなく、画像形成部との間に温度差がある。この
ため、定着部材等の正確な温度制御を行うことが難し
い。However, temperature measurement using the thermistor has the following problems. When the thermistor is brought into contact with the image forming section of the fixing member, the detected temperature is the temperature at a portion that directly contacts the toner image and the recording medium, so that accurate fixing temperature control can be performed. However, the offset toner adhered to the surface of the fixing member may adhere to the temperature detecting surface of the thermistor, and the accuracy of temperature measurement may be reduced. Further, the contact of the thermistor may damage the surface of the fixing member or the intermediate transfer body that is driven to rotate,
These scratches cause poor fixing. On the other hand, when the temperature is measured by bringing the thermistor into contact with the non-image forming portion of the fixing member or the intermediate transfer body, that is, the side edge of the peripheral surface, these problems do not occur, but the measurement portion is pressed against the toner image and the recording medium. There is a temperature difference between the image forming unit and the portion where the temperature is not changed. Therefore, it is difficult to accurately control the temperature of the fixing member and the like.
【０００６】このような問題点に対し、特開平5-100591
号公報には、被測定物に非接触の状態で温度を測定する
赤外線センサを用いた定着装置が開示されている。この
定着装置は、加熱源を内蔵したヒートロールと、該ヒー
トロールに圧接された加圧ロールとからなり、該ヒート
ロールの近傍に温度測定装置のセンサユニットが設けら
れている。該センサユニット内には、赤外線センサと補
正用の温度センサであるサーミスタとが配設されてい
る。この赤外線センサは、ヒートロールから放射される
赤外線を検知し、これに対応する検出値から温度を測定
する。該赤外線センサの検出値は、周囲の温度に影響を
受けるため、サーミスタによって測定された赤外線セン
サの周囲の温度に基づいて補正される。To solve such a problem, Japanese Patent Application Laid-Open No. Hei.
Japanese Patent Application Laid-Open Publication No. H11-163873 discloses a fixing device using an infrared sensor that measures the temperature in a state where the measurement object is not in contact with the object. The fixing device includes a heat roll having a built-in heating source, and a pressure roll pressed against the heat roll, and a sensor unit of a temperature measuring device is provided near the heat roll. In the sensor unit, an infrared sensor and a thermistor, which is a temperature sensor for correction, are provided. This infrared sensor detects infrared rays radiated from the heat roll, and measures temperature from a detected value corresponding to the infrared rays. Since the detection value of the infrared sensor is affected by the ambient temperature, it is corrected based on the ambient temperature of the infrared sensor measured by the thermistor.
【０００７】このような定着装置では、ヒートロールの
表面に接触することなく該ヒートロールの画像形成部の
温度を測定することができる。しかしながら、上記定着
装置では、継続して使用することにより、赤外線センサ
の受感部にトナーや紙粉等の汚れが付着すると、被測定
物から入射する赤外線のエネルギーが低下してしまい、
温度測定の精度が低下するおそれがある。そして、この
ような受感部の汚れによる測定誤差を補正することがで
きない。In such a fixing device, the temperature of the image forming section of the heat roll can be measured without contacting the surface of the heat roll. However, in the above-described fixing device, if dirt such as toner or paper powder adheres to the sensing portion of the infrared sensor due to continuous use, the energy of infrared light incident from the measured object decreases,
The accuracy of temperature measurement may be reduced. Then, it is not possible to correct such a measurement error due to the contamination of the sensing part.
【０００８】本願発明は上記のような問題点に鑑みてな
されたものであり、その目的は、非接触式の温度測定装
置によって被測定物の温度を正確に測定することであ
り、特に、定着装置又は転写と定着とを同時に行う装置
における定着部の温度を正確に測定し、適切な定着温度
を維持することである。The present invention has been made in view of the above problems, and an object of the present invention is to accurately measure the temperature of an object to be measured by a non-contact type temperature measuring device. The purpose is to accurately measure the temperature of a fixing unit in an apparatus or an apparatus that simultaneously performs transfer and fixing, and maintain an appropriate fixing temperature.
【０００９】[0009]
【課題を解決するための手段】上記の課題を解決するた
めに、請求項１に係る発明は、 被測定物の表面温度
を、該被測定物に非接触の状態で検出する第１の温度検
知手段と、 前記被測定物に対して前記温度検知手段
を、遮蔽状態又は非遮蔽状態とするように移動可能な遮
蔽板と、 前記遮蔽板の温度又は該遮蔽板と温度が近似
する部分の温度を検出する第２の温度検出手段と、を有
し、 前記第２の温度検知手段によって検出された前記
遮蔽板の温度と、前記第１の温度検知手段によって検出
された該遮蔽板の温度とを比較し、該比較の結果に基づ
いて、前記第１の温度検知手段による前記被測定物の検
出温度を補正するものであることを特徴とする温度測定
装置を提供する。According to a first aspect of the present invention, there is provided a first temperature detecting device for detecting a surface temperature of an object to be measured in a non-contact state with the object to be measured. Detecting means, a shielding plate movable with respect to the measured object so as to be in a shielding state or a non-shielding state, and a temperature of the shielding plate or a portion in which the temperature is close to the shielding plate. A second temperature detecting means for detecting a temperature, wherein the temperature of the shielding plate detected by the second temperature detecting means and the temperature of the shielding plate detected by the first temperature detecting means And correcting the detected temperature of the object to be measured by the first temperature detecting means based on the result of the comparison.
【００１０】なお、上記第１の温度検知手段による上記
遮蔽板の検出値と上記第２の温度検知手段による検出値
との比較は、該遮蔽板の温度のほか、例えば、遮蔽板の
温度に対応する電流値、電圧値又は抵抗値などを比較す
るものであってもよい。The comparison between the value detected by the first temperature detecting means and the value detected by the second temperature detecting means depends on the temperature of the shielding plate and, for example, the temperature of the shielding plate. The corresponding current value, voltage value or resistance value may be compared.
【００１１】上記第１の温度検知手段は、被測定物に非
接触の状態で温度測定を行うため、被測定物の構成や材
質によって、設置場所が限られたり、温度を検知する部
分に汚れが付着して温度測定精度が低下したりすること
が少ない。また、被測定物が該第１の温度検知手段の接
触によって傷付くのを防止できる。そして、被測定物の
温度測定中以外は、上記遮蔽板によって被測定物に対し
て該第１の温度検知手段を遮蔽し、被測定物から該第１
の温度検知手段に汚れが飛翔したりするのを防止でき
る。一方、このような遮蔽板を設けても、継続的に使用
することにより該第１の温度検知手段の温度検知部に汚
れが付着し、測定精度が低下してしまうことがある。し
かし、上記温度測定装置は、遮蔽板が第１の温度検知手
段を遮蔽しているときに該遮蔽板の温度を検出すること
ができ、上記第２の温度検知手段による検出値と比較す
ることによって、該第１の温度検知手段による前記被測
定物の検出温度を補正することができる。つまり、第１
の温度検知手段と第２の温度検知手段とが同じ部位の温
度を検出し、これらの検出値を対比するため、第１の温
度検知手段に汚れが付着した場合にも、検出値を補正し
て被測定物の温度を正確に測定することができる。な
お、第２の温度検知手段は遮蔽板の温度のみを検出すれ
ばよく、汚れによる影響が生じないように設置すること
は容易である。Since the first temperature detecting means measures the temperature without contacting the object to be measured, an installation place is limited depending on the structure and material of the object to be measured. Is less likely to be attached and temperature measurement accuracy is reduced. Further, it is possible to prevent the object to be measured from being damaged by the contact of the first temperature detecting means. When the temperature of the device under test is not being measured, the first temperature detecting means is shielded from the device under test by the shield plate, and the first temperature detecting means is removed from the device under test by the first plate.
The dirt can be prevented from flying on the temperature detecting means. On the other hand, even if such a shielding plate is provided, if it is continuously used, dirt may adhere to the temperature detecting portion of the first temperature detecting means, and measurement accuracy may be reduced. However, the temperature measurement device can detect the temperature of the shield plate when the shield plate is shielding the first temperature detection unit, and can compare the temperature with the detection value of the second temperature detection unit. Thereby, the temperature detected by the first temperature detecting means for the object to be measured can be corrected. That is, the first
The temperature detecting means and the second temperature detecting means detect the temperature of the same part and compare the detected values. Therefore, even if the first temperature detecting means becomes dirty, the detected value is corrected. Thus, the temperature of the measured object can be accurately measured. The second temperature detecting means only needs to detect the temperature of the shielding plate, and it is easy to install the second temperature detecting means so as not to be affected by dirt.
【００１２】請求項２に係る発明は、 請求項１に記載
の温度測定装置において、前記第２の温度検知手段は、
前記遮蔽板の温度を、該遮蔽板に接触した状態で測定す
る温度センサであることを特徴とする。According to a second aspect of the present invention, in the temperature measuring device according to the first aspect, the second temperature detecting means includes:
It is a temperature sensor for measuring the temperature of the shielding plate in a state of being in contact with the shielding plate.
【００１３】上記第２の温度検知手段は遮蔽板に接触し
ているため、該第２の温度検知手段は、トナーの付着等
の汚れに影響されにくい。このため、該第２の温度検知
手段は継続的に使用しても、温度の測定精度を良好に維
持することが可能である。そして、該第２の温度検知手
段によって遮蔽板の温度を正確に検出して、上記第１の
温度検知手段による検出値と比較し、該第１の温度検知
手段による前記被測定物の検出温度を補正することがで
きる。Since the second temperature detecting means is in contact with the shielding plate, the second temperature detecting means is hardly affected by contamination such as toner adhesion. For this reason, even if the second temperature detecting means is used continuously, it is possible to maintain good temperature measurement accuracy. Then, the temperature of the shielding plate is accurately detected by the second temperature detecting means and compared with the detected value of the first temperature detecting means, and the temperature of the object to be measured by the first temperature detecting means is detected. Can be corrected.
【００１４】請求項３に係る発明は、 請求項１に記載
の温度測定装置において、前記遮蔽板の前記第１の温度
検知手段と対向する面が、黒色に仕上げられていること
を特徴とする。According to a third aspect of the present invention, in the temperature measuring device according to the first aspect, a surface of the shield plate facing the first temperature detecting means is finished in black. .
【００１５】上記遮蔽板は、第１の温度検知手段と対向
する面が黒色であるため、周囲の部材から放射される赤
外線を反射しにくくなっている。このため、該第１の温
度検知手段によって、該遮蔽板の温度を正確に検知する
ことができる。Since the surface of the shielding plate facing the first temperature detecting means is black, it is difficult to reflect infrared rays radiated from surrounding members. For this reason, the temperature of the shielding plate can be accurately detected by the first temperature detecting means.
【００１６】請求項４に係る発明は、 請求項１に記載
の温度測定装置において、前記第１の温度検知手段は、
赤外線センサであることを特徴とする。According to a fourth aspect of the present invention, in the temperature measuring device according to the first aspect, the first temperature detecting means includes:
It is an infrared sensor.
【００１７】上記赤外線センサは、一般に、赤外線のみ
を透過する赤外線フィルターと、透過した赤外線を吸収
する赤外線吸収体と、赤外線吸収体の温度を検知する測
定装置とで主要部が構成されている。該赤外線センサ
は、非接触式の温度測定装置として汎用されており、取
り扱いや取り付けが容易であるため利用しやすい。The infrared sensor generally comprises an infrared filter that transmits only infrared light, an infrared absorber that absorbs transmitted infrared light, and a measuring device that detects the temperature of the infrared absorber. The infrared sensor is widely used as a non-contact type temperature measuring device, and is easy to handle and attach, so that it is easy to use.
【００１８】請求項５に係る発明は、 周回可能な無端
状周面を有し、該周面が未定着トナー像を担持した記録
媒体に当接される加熱定着体と、 前記加熱定着体の、
少なくとも周面付近を加熱する加熱装置と、 前記加熱
定着体の周面と対向するように配置され、前記記録媒体
を前記加熱定着体に押圧する加圧部材と、 前記加熱定
着体と非接触で対向するように配置され、該加熱定着体
の表面温度を検出する第１の温度検知手段と、 前記加
熱定着体に対して前記第１の温度検知手段を、遮蔽状態
又は非遮蔽状態とするように移動可能な遮蔽板と、 前
記遮蔽板の温度又は該遮蔽板と温度が近似する部分の温
度を検出する第２の温度検出手段と、前記第２の温度検
知手段によって検出された前記遮蔽板の温度と、前記第
１の温度検知手段によって検出された該遮蔽板の温度と
を比較し、該比較の結果に基づいて、前記第１の温度検
知手段による前記加熱定着体の検出温度を補正する温度
補正手段と、 前記温度補正手段で補正された温度に基
づいて、前記加熱装置による前記加熱定着体の加熱を制
御する制御手段とを有することを特徴とする定着装置を
提供する。According to a fifth aspect of the present invention, there is provided a heating and fixing member having an endless peripheral surface which can rotate, the peripheral surface being in contact with a recording medium carrying an unfixed toner image, ,
A heating device that heats at least the vicinity of the peripheral surface; a pressing member that is disposed to face the peripheral surface of the heat-fixing member and presses the recording medium against the heat-fixing member; A first temperature detecting unit that is disposed to face and detects a surface temperature of the heat-fixed body; and sets the first temperature detection unit with respect to the heat-fixed body in a shielded state or a non-shielded state. , A second temperature detecting means for detecting a temperature of the shielding plate or a temperature of a portion where the temperature is close to the shielding plate, and the shielding plate detected by the second temperature detecting means. Is compared with the temperature of the shielding plate detected by the first temperature detecting means, and based on the result of the comparison, the temperature detected by the first temperature detecting means of the heat fixing member is corrected. Temperature correction means for performing Based on the corrected temperature a positive means to provide a fixing device which is characterized in that a control means for controlling the heating of the heat fixing member due to the heating device.
【００１９】上記加熱定着体は、第１の温度検知手段に
よって非接触の状態で測定されているため、該第１の温
度検知手段によって加熱定着体の表面に傷をつけたりす
ることなく、該加熱定着体の表面温度を測定することが
できる。また、該第１の温度検知手段の温度検知面に加
熱定着体上のオフセットトナーが付着し、温度測定精度
が低下してしまうことがない。また、該第１の温度検知
手段は、遮蔽板によって遮蔽することができるため、継
続的に使用しても紙粉等の汚れが付着しにくい。さら
に、遮蔽板が第１の温度検知手段を遮蔽しているときに
該遮蔽板の温度を検出し、上記第２の温度検知手段によ
る検出値と比較することによって、該第１の温度検知手
段に汚れが付着することによって感度の変化等が生じて
も、加熱定着体の検出温度を補正することができる。こ
のため、加熱定着体の温度を正確に測定することがで
き、上記制御手段によって加熱装置を制御し、良好な定
着温度を維持することできる。Since the heat-fixed body is measured in a non-contact state by the first temperature detecting means, the heat-fixed body can be heated without damaging the surface of the heat-fixed body by the first temperature detecting means. The surface temperature of the fixing body can be measured. Further, there is no possibility that the offset toner on the heat fixing body adheres to the temperature detecting surface of the first temperature detecting means and the accuracy of temperature measurement is lowered. Further, since the first temperature detecting means can be shielded by the shielding plate, it is difficult for dirt such as paper dust to adhere even when used continuously. Further, by detecting the temperature of the shielding plate when the shielding plate is shielding the first temperature detecting means and comparing the detected temperature with the value detected by the second temperature detecting means, Even if a change in sensitivity or the like occurs due to the attachment of dirt to the surface, the detected temperature of the heat fixing member can be corrected. For this reason, the temperature of the heat fixing member can be accurately measured, and the heating device can be controlled by the control means, so that a favorable fixing temperature can be maintained.
【００２０】[0020]
【発明の実施の形態】以下に、本願に係る発明の実施の
形態を図１に基づいて説明する。図１は、請求項１、請
求項２、請求項３又は請求項４に係る発明の一実施形態
である温度測定装置及び請求項５に係る発明の一実施形
態である定着装置を示す概略構成図である。この定着装
置は、内部に加熱源１ａを備え中心軸回りに回転が可能
に支持された定着ロール１と、該定着ロール１の軸線と
平行に支持され定着ロール１に圧接される加圧ロール２
とで構成されている。該定着ロール１は、図示しない駆
動モータにより回転駆動され、加圧ロール２は、定着ロ
ール１に従動して回転する。そして、これら２つのロー
ラの圧接部に未定着トナー像を担持した記録紙Pが送り
込まれ、トナー像は加熱溶融されて記録紙Pに圧着し、
定着画像が形成される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIG. FIG. 1 is a schematic configuration showing a temperature measuring device according to an embodiment of the present invention according to claim 1, 2, 3, or 4, and a fixing device according to an embodiment of the present invention according to claim 5. FIG. This fixing device includes a fixing roll 1 provided with a heating source 1a therein and rotatably supported around a central axis, and a pressing roll 2 supported in parallel with the axis of the fixing roll 1 and pressed against the fixing roll 1.
It is composed of The fixing roll 1 is rotationally driven by a drive motor (not shown), and the pressure roll 2 rotates following the fixing roll 1. Then, the recording paper P carrying the unfixed toner image is fed into the pressure contact portion of these two rollers, and the toner image is heated and melted and pressed against the recording paper P,
A fixed image is formed.
【００２１】また、定着ロール１と加圧ロール２との圧
接部の上流側で該定着ロール１と対向する位置に、第１
の温度検知装置３と、該定着ロール１に対して該第１の
温度検知装置３を遮蔽又は非遮蔽とするよう移動可能な
遮蔽板４と、該遮蔽板４に固着された第２の温度検知装
置５と、定着ロール１の温度測定及び温度補正を行う温
度測定装置６と、定着ロール１の加熱源１ａの駆動を制
御する制御装置７とが配設されている。Further, at a position upstream of the pressure contact portion between the fixing roll 1 and the pressure roll 2 and facing the fixing roll 1, a first
A temperature detecting device 3, a shielding plate 4 movable with respect to the fixing roll 1 so as to shield or unshield the first temperature detecting device 3, and a second temperature fixed to the shielding plate 4. A detection device 5, a temperature measurement device 6 for measuring and correcting the temperature of the fixing roll 1, and a control device 7 for controlling the driving of the heating source 1a of the fixing roll 1 are provided.
【００２２】上記定着ロール１は、金属製の円筒状芯金
１ｂの内部にハロゲンランプなどの加熱源１ａを備えて
おり、該芯金１ｂの表面にスポンジやゴムなどの弾性層
１ｃと、更にその表面にPFA（テトラフルオロエチレン
−ベンフルオロエチレン コポリマー）などからなる離
型層１ｄとを有する。該加熱源１ａは、定着ロール１の
表面温度がトナー像の定着に最適な温度を維持するよ
う、制御装置７によって電源のON・OFF制御が行われ
る。The fixing roll 1 is provided with a heating source 1a such as a halogen lamp inside a metal cylindrical core 1b, and an elastic layer 1c such as sponge or rubber on the surface of the core 1b. On its surface, a release layer 1d made of PFA (tetrafluoroethylene-benfluoroethylene copolymer) or the like is provided. The power supply of the heating source 1a is controlled by a control device 7 so that the surface temperature of the fixing roll 1 is maintained at an optimum temperature for fixing the toner image.
【００２３】上記加圧ロール２は、金属製の円筒状芯金
２ａを芯材とし、該芯金２ａの表面にスポンジやゴムな
どの弾性層２ｂと、更にその表面にPFAなどからなる離
型層２ｃとを有する。該加圧ロール２は上記定着ロール
１に圧接されており、それぞれのロールが有する弾性層
によって、良好なトナー像の定着に必要なニップ幅が得
られる。The pressure roll 2 has a core made of a metal cylindrical core 2a, an elastic layer 2b such as sponge or rubber on the surface of the metal core 2a, and a mold release made of PFA or the like on the surface. And a layer 2c. The pressure roll 2 is pressed against the fixing roll 1, and the elastic layer of each roll provides a nip width required for fixing a good toner image.
【００２４】上記第１の温度検知装置３は、定着ロール
１の温度を該定着ロール１に非接触の状態で測定するも
のであり、例えば、定着ロール１から放射される赤外線
を検知して温度を測定する赤外線センサを用いることが
できる。該赤外線センサは、赤外線のみを透過する赤外
線フィルターと、透過した赤外線を吸収する赤外線吸収
体と、赤外線吸収体の温度を検知する熱電対とで主要部
が構成されている。該赤外線吸収体は、Au又はBi等の金
属黒からなり、赤外線フィルターを透過した赤外線によ
り金属が発熱する。熱電対は、二種類の異種金属または
半導体の一端を赤外線吸収体に接触させるとともに、他
端を基準温度下におき、両端の温度差によって生じた起
電力によって温度を測定する。この熱電対には、クロム
−ニッケル合金、アルミニウム−ニッケル合金等の異種
金属や、ｎ型−ｐ型の半導体が用いられる。The first temperature detecting device 3 measures the temperature of the fixing roll 1 in a state where the fixing roll 1 is not in contact with the fixing roll 1. Can be used. The infrared sensor mainly includes an infrared filter that transmits only infrared light, an infrared absorber that absorbs transmitted infrared light, and a thermocouple that detects the temperature of the infrared absorber. The infrared absorber is made of black metal such as Au or Bi, and the metal generates heat by infrared rays transmitted through the infrared filter. The thermocouple has one end of two kinds of dissimilar metals or semiconductors in contact with the infrared absorber, the other end at a reference temperature, and measures the temperature by an electromotive force generated by a temperature difference between both ends. As the thermocouple, a dissimilar metal such as a chromium-nickel alloy or an aluminum-nickel alloy, or an n-type / p-type semiconductor is used.
【００２５】上記第２の温度検知装置５としてはサーミ
スタを用いることができ、該サーミスタの温度検知面を
遮蔽板４に接触した状態で該遮蔽板４の温度を測定す
る。遮蔽板４と温度検知面との接触部は継続的に使用し
ても汚れにくいため、測定精度を維持することができ、
正確な温度測定が可能となる。サーミスタは、電気抵抗
の温度係数が大きい素子を被測定物に接触させ、抵抗値
を検出することにより測定物の温度を検知するものであ
る。素子としては、温度上昇に伴い抵抗が減少するMnO-
NiO-CoO系焼結体や、抵抗が増加するBaTiO3が一般に用
いられている。As the second temperature detecting device 5, a thermistor can be used, and the temperature of the shielding plate 4 is measured while the temperature detecting surface of the thermistor is in contact with the shielding plate 4. Since the contact portion between the shielding plate 4 and the temperature detection surface is hardly soiled even when used continuously, the measurement accuracy can be maintained,
Accurate temperature measurement becomes possible. The thermistor detects the temperature of a measured object by bringing an element having a large temperature coefficient of electrical resistance into contact with the measured object and detecting the resistance value. MnO- element whose resistance decreases with increasing temperature
NiO-CoO-based sintered bodies and BaTiO3, whose resistance increases, are generally used.
【００２６】上記温度測定装置６は、図２に示すよう
に、第１の温度検知装置３による検出値が入力される第
１の温度測定部６ａと、第２の温度検知装置５による検
出値が入力される第２の温度測定部６ｂとを備え、該第
１の温度測定部６ａ及び第２の温度測定部６ｂには、第
１の温度検知装置３及び第２の温度検知装置５からの出
力信号を温度に変換するための、それぞれの温度検知装
置に固有の温度変換係数が記録されている。そして、対
比・校正部６ｃは、第１の温度測定部６ａで得られた測
定値と第２の温度測定部６ｂで得られた測定値とを対比
し、この結果に基づいて第１の温度測定部６ａにおける
温度変換係数を変更するように構成されている。As shown in FIG. 2, the temperature measuring device 6 includes a first temperature measuring section 6a to which a value detected by the first temperature detecting device 3 is input, and a value detected by the second temperature detecting device 5. And a second temperature measuring section 6b to which the first temperature measuring section 6a and the second temperature measuring section 6b are inputted. The temperature conversion coefficient unique to each temperature detecting device for converting the output signal of the above into a temperature is recorded. Then, the comparing / calibrating unit 6c compares the measured value obtained by the first temperature measuring unit 6a with the measured value obtained by the second temperature measuring unit 6b, and based on the result, determines the first temperature. It is configured to change the temperature conversion coefficient in the measuring section 6a.
【００２７】以下に、定着ロール１の温度測定方法及び
温度補正について説明する。遮蔽板４が、上記定着ロー
ル１に対して第１の温度検知装置３を非遮蔽状態とする
位置にあるとき、第１の温度検知装置３は、定着ロール
１から放射される赤外線を検知し、これに対応する信号
を第１の温度測定部６ａに出力する。第１の温度測定部
６ａでは、第１の温度測定部６ａに記録されている温度
変換係数に基づき出力信号を温度に変換する。そして、
この温度が定着ロール１の表面温度として制御装置７に
入力され、該制御装置７によって定着ロール１の加熱源
１ａの駆動が制御される。つまり、入力された温度が所
定の温度より低いときには加熱源１ａの電源をＯＮと
し、温度が所定の温度より高いときにはＯＦＦとするよ
うに制御される。The method for measuring the temperature of the fixing roll 1 and the temperature correction will be described below. When the shielding plate 4 is at a position where the first temperature detecting device 3 is set in the non-shielding state with respect to the fixing roll 1, the first temperature detecting device 3 detects infrared rays radiated from the fixing roll 1. , And outputs a corresponding signal to the first temperature measuring section 6a. The first temperature measuring unit 6a converts an output signal into a temperature based on a temperature conversion coefficient recorded in the first temperature measuring unit 6a. And
This temperature is input to the control device 7 as the surface temperature of the fixing roll 1, and the driving of the heating source 1 a of the fixing roll 1 is controlled by the control device 7. That is, when the input temperature is lower than the predetermined temperature, the power of the heating source 1a is turned on, and when the input temperature is higher than the predetermined temperature, the power is turned off.
【００２８】一方、上記遮蔽板４が、上記定着ロール１
に対して第１の温度検知装置３を遮蔽状態とする位置に
あるとき、第１の温度検知装置３は遮蔽板４から放射さ
れる赤外線を検知する。そして、この赤外線に対応する
信号が第１の温度測定部６ａに出力され、第１の温度測
定部６ａにおいて温度Ｔ１に変換される。また、これと
同時に、第２の温度検知装置５によって遮蔽板４の温度
が検知され、第２の温度測定部６ｂに信号として出力さ
れ、温度Ｔ２に変換される。そして、上記対比・校正部
６ｃにおいて温度Ｔ１と温度Ｔ２とを比較し、温度Ｔ１
と温度Ｔ２とに差がある場合、図３に示すように、温度
Ｔ２を真の値として第１の温度測定部６ａに記録されて
いる温度変換係数を変更する。このようにして、第１の
温度検知装置３よる定着ロール１の測定温度を補正す
る。On the other hand, the shielding plate 4 is
When the first temperature detecting device 3 is located at a position where the first temperature detecting device 3 is in the shielding state, the first temperature detecting device 3 detects infrared rays emitted from the shielding plate 4. Then, a signal corresponding to the infrared light is output to the first temperature measuring unit 6a, and is converted into the temperature T1 in the first temperature measuring unit 6a. At the same time, the temperature of the shielding plate 4 is detected by the second temperature detecting device 5, and is output as a signal to the second temperature measuring unit 6b, and is converted into the temperature T2. Then, the comparison / calibration unit 6c compares the temperature T1 with the temperature T2, and
If there is a difference between the temperature and the temperature T2, as shown in FIG. 3, the temperature T2 is changed to a true value and the temperature conversion coefficient recorded in the first temperature measuring unit 6a is changed. Thus, the measured temperature of the fixing roll 1 by the first temperature detecting device 3 is corrected.
【００２９】上記第１の温度検知装置３は、定着ロール
１に非接触の状態であるため、定着ロール１の表面に傷
をつけたりすることなく、定着ロール１の画像形成部の
温度を検出することができる。また、継続的に使用する
ことにより、第１の温度検知装置３の受感部にトナーや
紙粉等の汚れが付着することがあり、この汚れによって
該第１の温度検知装置３の出力精度が低下するおそれが
ある。しかし、上述のように、第１の温度測定部６ａの
温度変換係数を定期的に変更することにより、第１の温
度検知装置３によって定着ロール１の温度を正確に測定
することができ、良好な定着温度を維持できる。上記温
度変換係数の変更は、所定の時間が経過するごとに行っ
てもよいし、所定の枚数の画像を定着するごとに行って
もよい。The first temperature detecting device 3 detects the temperature of the image forming portion of the fixing roll 1 without damaging the surface of the fixing roll 1 because the first temperature detecting device 3 is not in contact with the fixing roll 1. be able to. In addition, due to continuous use, dirt such as toner and paper dust may adhere to the sensing portion of the first temperature detecting device 3, and the dirt may cause the output accuracy of the first temperature detecting device 3. May decrease. However, as described above, by periodically changing the temperature conversion coefficient of the first temperature measuring unit 6a, the temperature of the fixing roll 1 can be accurately measured by the first temperature detecting device 3, which is favorable. A high fixing temperature can be maintained. The change of the temperature conversion coefficient may be performed each time a predetermined time elapses, or may be performed each time a predetermined number of images are fixed.
【００３０】なお、上記定着装置において、加熱源を内
蔵した加圧ロールを用いることもできる。この場合、上
記定着ロール１の温度を測定及び補正するのと同様に、
加圧ロールの温度を非接触の状態で測定する第１の温度
検知装置と、遮蔽板と、該遮蔽板に固着された第２の温
度検知装置と、温度測定装置と、加圧ロール２加熱源の
駆動を制御する制御装置とを配設する。そして、該加圧
ロールの表面温度を正確に測定し、適切な定着温度を維
持することによって、より良好な定着を行うことができ
る。In the fixing device, a pressure roll having a built-in heating source can be used. In this case, similarly to measuring and correcting the temperature of the fixing roll 1,
A first temperature detecting device for measuring the temperature of the pressure roll in a non-contact state, a shielding plate, a second temperature detection device fixed to the shielding plate, a temperature measuring device, and a heating device for heating the pressure roll 2 A control device for controlling the driving of the source. By accurately measuring the surface temperature of the pressure roll and maintaining an appropriate fixing temperature, better fixing can be performed.
【００３１】次に、請求項１、請求項２、請求項３又は
請求項４に係る発明の他の実施形態である温度測定装置
及び請求項５に係る発明の他の実施形態である定着装置
を、図４に基づいて説明する。この定着装置は、内部に
加熱源１１ａを備えた定着ロール１１と、この定着ロー
ル１１と平行に支持された支持ロール１２と、該支持ロ
ール１２と定着ロール１１とに張架された定着ベルト１
３と、この定着ベルト１３を介して定着ロール１１に圧
接される加圧ロール１４とを有している。また、定着ロ
ール１１の近傍で加圧ロール１４との圧接部の上流側に
は、該遮蔽板１５を備えた温度検知装置１６と、温度測
定装置１７と、制御装置１８とが配設されている。な
お、定着ロール１１、加圧ロール１４、遮蔽板１５、温
度測定装置１７、制御装置１８は、図１に示す定着装置
と同様のものが用いられている。上記温度測定装置１７
は、第１の温度測定部１７ａと、第２の温度測定部１７
ｂと、対比・校正部１７ｃとで構成されている。Next, a temperature measuring apparatus according to another embodiment of the present invention, and a fixing apparatus according to another embodiment of the present invention will be described. Will be described with reference to FIG. The fixing device includes a fixing roll 11 having a heating source 11 a therein, a support roll 12 supported in parallel with the fixing roll 11, and a fixing belt 1 stretched between the support roll 12 and the fixing roll 11.
3 and a pressure roll 14 pressed against the fixing roll 11 via the fixing belt 13. A temperature detecting device 16 having the shielding plate 15, a temperature measuring device 17, and a control device 18 are provided near the fixing roll 11 and on the upstream side of the pressure contact portion with the pressure roll 14. I have. The fixing roll 11, the pressure roll 14, the shielding plate 15, the temperature measuring device 17, and the control device 18 are the same as those of the fixing device shown in FIG. The temperature measuring device 17
Are a first temperature measuring unit 17a and a second temperature measuring unit 17
b and a comparison / calibration unit 17c.
【００３２】上記温度検知装置１６は、図１に示す定着
装置で用いられている第１の温度検知装置３とほぼ同じ
構成の赤外線センサであり、該温度検知装置１６本体の
温度を測定する補正用温度検知器１６ａを備えている。
遮蔽板１５が、定着ロール１１に対して温度検知装置１
６を遮蔽しない位置にある時、該温度検知装置１６は定
着ロール１１から放射される赤外線を検知し、第１の温
度測定部１７ａに信号を出力する。第１の温度測定部１
７ａでは、温度変換係数に基づき出力信号を温度に変換
し、この温度が制御装置１８に入力され、加熱源１１ａ
の駆動が制御される。The temperature detecting device 16 is an infrared sensor having substantially the same configuration as the first temperature detecting device 3 used in the fixing device shown in FIG. Temperature detector 16a.
The shielding plate 15 is provided between the fixing roller 11 and the temperature detecting device 1.
When the position of the fixing roller 6 is not shielded, the temperature detecting device 16 detects infrared rays emitted from the fixing roll 11 and outputs a signal to the first temperature measuring section 17a. First temperature measuring unit 1
At 7a, the output signal is converted into a temperature based on the temperature conversion coefficient, and this temperature is input to the control device 18 and the heating source 11a
Is controlled.
【００３３】一方、上記定着装置がウォーミングアップ
を開始した直後に、補正用温度検知器１６ａによって温
度検知装置１６本体の温度が検知され、第２の温度測定
部１７ｂにおいて温度に変換される。また、このとき、
遮蔽板１５によって定着ロール１１と温度検知装置１６
とが遮蔽されており、該温度検知装置１６によって該遮
蔽板１５の温度が検知され、第１の温度測定部１７ａに
おいて温度に変換される。そして、上記対比・校正部１
７ｃにおいてこれら２つの温度を比較し、第１の温度測
定部１７ａの温度変換係数を変更する。On the other hand, immediately after the fixing device starts warming up, the temperature of the main body of the temperature detecting device 16 is detected by the correcting temperature detector 16a, and converted into the temperature in the second temperature measuring section 17b. At this time,
The fixing roll 11 and the temperature detecting device 16
Are shielded, and the temperature of the shielding plate 15 is detected by the temperature detecting device 16 and converted into a temperature in the first temperature measuring unit 17a. Then, the comparison / calibration unit 1
At 7c, these two temperatures are compared, and the temperature conversion coefficient of the first temperature measuring unit 17a is changed.
【００３４】この定着装置では、ウォーミングアップ開
始直後の遮蔽板１５と温度検知装置１６本体との実際の
温度を同一とみなすことによって、温度検知装置１６に
よる遮蔽板１５の測定温度と補正用温度検知器１６ａに
よる測定温度とを比較し温度補正を行う。定着装置が長
時間使用されない状態にあった後、ウォーミングアップ
開始直後は、遮蔽板１５及び温度検知装置１６はほぼ室
温となっており、同一の温度とみなすことができる。こ
のため、別途に遮蔽板１５の温度を測定する接触式の温
度検知器を備える必要がなくなり、装置を簡素化でき
る。なお、この定着装置において、図１に示すものと同
様に、第２の温度検知装置を用いて定着ロール１１の温
度補正を行うこともできる。In this fixing device, the actual temperature of the shielding plate 15 immediately after the start of warming-up and the actual temperature of the temperature detecting device 16 are regarded as the same, so that the measured temperature of the shielding plate 15 by the temperature detecting device 16 and the correction temperature detector The temperature is corrected by comparing the measured temperature with the temperature 16a. Immediately after the fixing device has not been used for a long time and immediately after the start of warming-up, the shielding plate 15 and the temperature detecting device 16 are almost at room temperature, and can be regarded as having the same temperature. Therefore, it is not necessary to separately provide a contact-type temperature detector for measuring the temperature of the shielding plate 15, and the apparatus can be simplified. In this fixing device, the temperature of the fixing roll 11 can be corrected by using the second temperature detecting device, similarly to the fixing device shown in FIG.
【００３５】次に、請求項１、請求項２、請求項３又は
請求項４に記載の温度測定装置を用いることのできる画
像形成装置を図５に基づいて説明する。この画像形成装
置は、一様帯電後に像光を照射することにより表面に潜
像が形成される円筒状の感光体ドラム２１を備えてお
り、この感光体ドラム１の周囲に、感光体ドラム１の表
面を一様に帯電させる帯電装置２２と、感光体ドラム２
１に像光を照射して表面に潜像を形成する露光装置２３
と、異なる色の現像剤をそれぞれ収容した４つの現像器
を備え、感光体ドラム２１上の静電潜像をトナーの選択
的な付着によって可視化する回転式現像装置２４と、ト
ナー像の転写後に感光体ドラム２１に残留するトナーを
除去するクリーニング装置２５と、感光体ドラム２６の
表面を除電する除電露光装置２６と、感光体ドラム上の
トナー像を一次転写する転写ロール２７とを備えてい
る。Next, an image forming apparatus which can use the temperature measuring device according to claim 1, 2, 3, or 4 will be described with reference to FIG. The image forming apparatus includes a cylindrical photosensitive drum 21 on the surface of which a latent image is formed by irradiating image light after uniform charging, and a photosensitive drum 1 is provided around the photosensitive drum 1. Charging device 22 for uniformly charging the surface of the photosensitive drum 2
Exposure device 23 that irradiates image light to 1 to form a latent image on the surface
And a rotary developing device 24 that includes four developing devices each containing a developer of a different color, and visualizes an electrostatic latent image on the photosensitive drum 21 by selective adhesion of toner. The cleaning device 25 includes a cleaning device 25 that removes toner remaining on the photoconductor drum 21, a static elimination exposure device 26 that neutralizes the surface of the photoconductor drum 26, and a transfer roll 27 that primarily transfers a toner image on the photoconductor drum. .
【００３６】また、感光体ドラム２１と対向して、２つ
の支持ロール２８ａ、２８ｂと、転写ロール２９とによ
って周回可能に支持されている無端ベルト状の中間転写
体３０と、該中間転写体３０を挟んで加熱ロール２９に
圧接されている加圧ロール３１と、中間転写体を内側か
ら加熱する加熱装置３２と、二次転写後の中間転写体上
のトナーを除去するクリーニング装置３３とが配設され
ている。さらに、二次転写を行う圧接部の上流側で中間
転写体３０と対向する位置に、図１に示すものと同じ温
度測定装置３４が設けられている。Further, an endless belt-shaped intermediate transfer member 30 which is rotatably supported by two support rolls 28a and 28b and a transfer roll 29 in opposition to the photosensitive drum 21; A pressure roller 31 pressed against a heating roller 29 with the heating roller 32 interposed therebetween, a heating device 32 for heating the intermediate transfer member from the inside, and a cleaning device 33 for removing toner on the intermediate transfer member after the secondary transfer. Has been established. Further, the same temperature measuring device 34 as that shown in FIG. 1 is provided at a position facing the intermediate transfer body 30 on the upstream side of the pressure contact portion for performing the secondary transfer.
【００３７】このような画像形成装置では、感光体ドラ
ム２１上に形成された各色トナー像が、中間転写体３０
に順次一次転写され、該中間転写体上にフルカラーのト
ナー像が形成される。このトナー像は、中間転写体３０
の周回移動によって加熱装置３２と対向する位置を通過
する際に加熱溶融され、転写ロール２９と加圧ロール３
１との圧接部に搬送される。そして、これとタイミング
を合わせて記録紙Ｐが中間転写体３０と加圧ロール３１
との間に送り込まれ、トナー像は記録紙Ｐに圧着され
る。これにより、トナー像の転写と定着とが同時に行わ
れ、記録紙上に定着画像が形成される。In such an image forming apparatus, each color toner image formed on the photosensitive drum 21 is transferred to the intermediate transfer member 30.
, And a full-color toner image is formed on the intermediate transfer member. This toner image is transferred to the intermediate transfer body 30
Is heated and melted when passing through a position facing the heating device 32 by the orbital movement of the transfer roller 29 and the pressure roll 3
It is conveyed to the pressure contact portion with the first. Then, at the same time as this, the recording paper P is transferred to the intermediate transfer body 30 and the pressure roll 31.
And the toner image is pressed against the recording paper P. Thus, the transfer and fixing of the toner image are performed simultaneously, and a fixed image is formed on the recording paper.
【００３８】この画像形成装置では、図１に示す定着装
置と同様に、中間転写体３０の温度測定及び温度補正が
行われており、制御装置３４ａは補正された温度に基づ
き、加熱装置３２への電力供給を調整するものとなって
いる。このため、中間転写体３０は適切な温度に加熱さ
れ、中間転写体上で重ね合わされたトナー像を記録紙Ｐ
に良好に転写及び定着することができる。なお、この画
像形成装置は、上記温度測定装置３４に代えて、図４に
示す温度測定装置を用いることもできる。In this image forming apparatus, similarly to the fixing device shown in FIG. 1, the temperature of the intermediate transfer body 30 is measured and the temperature is corrected, and the control device 34a sends a signal to the heating device 32 based on the corrected temperature. Power supply is adjusted. For this reason, the intermediate transfer body 30 is heated to an appropriate temperature, and the toner image superposed on the intermediate transfer body is transferred to the recording paper P.
Transfer and fixation. The image forming apparatus may use a temperature measuring device shown in FIG. 4 instead of the temperature measuring device 34.
【００３９】[0039]
【発明の効果】以上説明したように、本願発明の温度測
定装置によれば、第１の温度検知手段が被測定物に非接
触であり、また、被測定物と該第１の温度検知手段との
間に遮蔽板が設けられているため、温度を検知する部分
に汚れが付着して温度測定精度が低下したりすることが
少ない。そして、遮蔽板が第１の温度検知手段を遮蔽し
ているときに該遮蔽板の温度を検出し、汚れ等の影響を
受けにくい第２の温度検知手段による検出値と比較する
ことによって、該第１の温度検知手段による前記被測定
物の検出温度を補正することができる。このため、該第
１の温度検知手段に汚れ等が付着した場合にも、被測定
物の温度を正確に測定することができる。また、定着装
置や画像形成装置においてこの温度測定装置を用いるこ
とによって、加熱定着体の温度を正確に測定することが
でき、良好な定着温度を維持することできる。As described above, according to the temperature measuring apparatus of the present invention, the first temperature detecting means is not in contact with the object to be measured, and the object to be measured and the first temperature detecting means are not in contact with each other. Since the shielding plate is provided between the first and second portions, it is unlikely that dirt adheres to the portion for detecting the temperature and the temperature measurement accuracy is reduced. Then, by detecting the temperature of the shield plate when the shield plate is shielding the first temperature detection unit, and comparing the detected temperature with the detection value of the second temperature detection unit that is not easily affected by dirt or the like, It is possible to correct the detected temperature of the object to be measured by the first temperature detecting means. Therefore, even when dirt or the like adheres to the first temperature detecting means, the temperature of the measured object can be accurately measured. Further, by using this temperature measuring device in a fixing device or an image forming apparatus, the temperature of the heated fixing body can be accurately measured, and a good fixing temperature can be maintained.
【図１】請求項１、請求項２、請求項３又は請求項４に
係る発明の一実施形態である温度測定装置及び請求項５
に係る発明の一実施形態である定着装置を示す概略構成
図である。FIG. 1 is a diagram showing a temperature measuring apparatus according to an embodiment of the present invention;
1 is a schematic configuration diagram illustrating a fixing device according to an embodiment of the present invention.
【図２】請求項１、請求項２、請求項３又は請求項４に
記載の温度測定装置を示す概略構成図である。FIG. 2 is a schematic configuration diagram showing a temperature measuring device according to claim 1, 2, 3, or 4;
【図３】請求項１、請求項２、請求項３又は請求項４に
記載の温度測定装置における温度補正を説明する図であ
る。FIG. 3 is a diagram for explaining temperature correction in the temperature measuring device according to claim 1, 2, 3, or 4;
【図４】請求項１、請求項２、請求項３又は請求項４に
係る発明の他の実施形態である温度測定装置及び請求項
５に係る発明の他の実施形態である定着装置を示す概略
構成図である。FIG. 4 shows a temperature measuring device according to another embodiment of the invention according to claim 1, 2, 3, or 4, and a fixing device according to another embodiment of the invention according to claim 5. It is a schematic block diagram.
【図５】請求項１、請求項２、請求項３又は請求項４に
記載の温度測定装置を用いることのできる画像形成装置
の一例を示す概略構成図である。FIG. 5 is a schematic configuration diagram illustrating an example of an image forming apparatus that can use the temperature measuring device according to claim 1, 2, 3, or 4.
１ 定着ロール ２ 加圧ロール ３ 第１の温度検知装置 ４ 遮蔽板 ５ 第２の温度検知装置 ６ 温度測定装置 ７ 制御装置 １１ 定着ロール １２ 支持ロール １３ 定着ベルト １４ 加圧ロール １５ 遮蔽板 １６ 温度検知装置 １７ 温度測定装置 １８ 制御装置 ２１ 感光体ドラム ２２ 帯電装置 ２３ 露光装置 ２４ 回転式現像装置 ２５ クリーニング
装置 ２６ 除電露光装置 ２７ 転写ロール ２８ 支持ロール ２９ 転写ロール ３０ 中間転写体 ３１ 加圧ロール ３２ 加熱装置 ３３ クリーニング
装置 ３４ 温度測定装置DESCRIPTION OF SYMBOLS 1 Fixing roll 2 Pressure roll 3 First temperature detecting device 4 Shielding plate 5 Second temperature detecting device 6 Temperature measuring device 7 Control device 11 Fixing roll 12 Supporting roll 13 Fixing belt 14 Pressure roll 15 Shielding plate 16 Temperature detection Apparatus 17 Temperature measuring device 18 Control device 21 Photoreceptor drum 22 Charging device 23 Exposure device 24 Rotary developing device 25 Cleaning device 26 Static elimination exposure device 27 Transfer roll 28 Support roll 29 Transfer roll 30 Intermediate transfer body 31 Pressure roll 32 Heating device 33 Cleaning device 34 Temperature measuring device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石野 正浩 埼玉県岩槻市府内３丁目７番１号 富士ゼ ロックス株式会社岩槻事業所内 (72)発明者 栗田 篤実 神奈川県海老名市本郷2274番地 富士ゼロ ックス株式会社海老名事業所内 Ｆターム(参考） 2G066 AA09 AC16 BA08 BA09 BB15 BC11 CB03 2H033 AA18 BA11 BA25 BA31 BA32 BB01 BB28 BE09 CA07 CA45 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro Ishino 3-7-1, Funai, Iwatsuki-shi, Saitama Fuji Xerox Co., Ltd. Iwatsuki Office (72) Inventor Atsumi Kurita 2274 Hongo, Ebina-shi, Kanagawa Fuji Xerox F term in Ebina Works Co., Ltd. (reference) 2G066 AA09 AC16 BA08 BA09 BB15 BC11 CB03 2H033 AA18 BA11 BA25 BA31 BA32 BB01 BB28 BE09 CA07 CA45
Claims (5)
非接触の状態で検出する第１の温度検知手段と、 前記被測定物に対して前記温度検知手段を、遮蔽状態又
は非遮蔽状態とするように移動可能な遮蔽板と、 前記遮蔽板の温度又は該遮蔽板と温度が近似する部分の
温度を検出する第２の温度検出手段と、を有し、 前記第２の温度検知手段によって検出された前記遮蔽板
の温度と、前記第１の温度検知手段によって検出された
該遮蔽板の温度とを比較し、該比較の結果に基づいて、
前記第１の温度検知手段による前記被測定物の検出温度
を補正するものであることを特徴とする温度測定装置。A first temperature detecting means for detecting a surface temperature of the measured object in a non-contact state with the measured object; and A shielding plate movable so as to be in a shielding state, and second temperature detecting means for detecting a temperature of the shielding plate or a temperature of a portion where the temperature is close to the shielding plate, and the second temperature Comparing the temperature of the shielding plate detected by the detecting means with the temperature of the shielding plate detected by the first temperature detecting means, based on the result of the comparison,
A temperature measuring device for correcting a temperature detected by the first temperature detecting means of the object to be measured.
板の温度を、該遮蔽板に接触した状態で測定する温度セ
ンサであることを特徴とする請求項１に記載の温度測定
装置。2. The temperature measuring device according to claim 1, wherein the second temperature detecting means is a temperature sensor that measures a temperature of the shielding plate in a state of being in contact with the shielding plate.
と対向する面が、黒色に仕上げられていることを特徴と
する請求項１に記載の温度測定装置。3. The temperature measuring device according to claim 1, wherein a surface of the shielding plate facing the first temperature detecting means is finished in black.
ンサであることを特徴とする請求項１に記載の温度測定
装置。4. The temperature measuring device according to claim 1, wherein said first temperature detecting means is an infrared sensor.
が未定着トナー像を担持した記録媒体に当接される加熱
定着体と、 前記加熱定着体の、少なくとも周面付近を加熱する加熱
装置と、 前記加熱定着体の周面と対向するように配置され、前記
記録媒体を前記加熱定着体に押圧する加圧部材と、 前記加熱定着体と非接触で対向するように配置され、該
加熱定着体の表面温度を検出する第１の温度検知手段
と、 前記加熱定着体に対して前記第１の温度検知手段を、遮
蔽状態又は非遮蔽状態とするように移動可能な遮蔽板
と、 前記遮蔽板の温度又は該遮蔽板と温度が近似する部分の
温度を検出する第２の温度検出手段と、 前記第２の温度検知手段によって検出された前記遮蔽板
の温度と、前記第１の温度検知手段によって検出された
該遮蔽板の温度とを比較し、該比較の結果に基づいて、
前記第１の温度検知手段による前記加熱定着体の検出温
度を補正する温度補正手段と、 前記温度補正手段で補正された温度に基づいて、前記加
熱装置による前記加熱定着体の加熱を制御する制御手段
とを有することを特徴とする定着装置。5. A heat-fixing member having an endless peripheral surface that can rotate, the peripheral surface being in contact with a recording medium carrying an unfixed toner image, and at least a portion near the peripheral surface of the heat-fixing member. A heating device for heating; a pressure member disposed to face the peripheral surface of the heat fixing member; and a pressing member for pressing the recording medium against the heat fixing member; and a pressure member disposed to face the heat fixing member in a non-contact manner. A first temperature detecting means for detecting a surface temperature of the heat-fixing member; and a shield movable with respect to the heat-fixing member such that the first temperature detecting means is in a shielding state or a non-shielding state. A plate, a second temperature detecting means for detecting a temperature of the shielding plate or a temperature of a portion where the temperature of the shielding plate approximates, a temperature of the shielding plate detected by the second temperature detecting means, The temperature of the shielding plate detected by the first temperature detecting means And based on the result of the comparison,
Temperature correction means for correcting the temperature detected by the first temperature detection means of the heat-fixed body; and control for controlling heating of the heat-fixed body by the heating device based on the temperature corrected by the temperature correction means. And a fixing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001122692A JP2002318160A (en) | 2001-04-20 | 2001-04-20 | Temperature measuring device and fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001122692A JP2002318160A (en) | 2001-04-20 | 2001-04-20 | Temperature measuring device and fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002318160A true JP2002318160A (en) | 2002-10-31 |
Family
ID=18972364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001122692A Withdrawn JP2002318160A (en) | 2001-04-20 | 2001-04-20 | Temperature measuring device and fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002318160A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005024436A (en) * | 2003-07-04 | 2005-01-27 | Ricoh Co Ltd | Temperature detection apparatus, fixing device, imaging forming apparatus, and temperature detecting apparatus |
| US7079782B2 (en) * | 2004-03-22 | 2006-07-18 | Kabushiki Kaisha Toshiba | Fuser and temperature control method |
| JP2007226003A (en) * | 2006-02-24 | 2007-09-06 | Konica Minolta Business Technologies Inc | Image forming apparatus |
| JP2012048131A (en) * | 2010-08-30 | 2012-03-08 | Ricoh Co Ltd | Heat fixing device and image forming apparatus equipped with the same |
| US9052668B2 (en) | 2013-02-05 | 2015-06-09 | Ricoh Company, Limited | Image forming apparatus, sensing method, and recording medium |
-
2001
- 2001-04-20 JP JP2001122692A patent/JP2002318160A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005024436A (en) * | 2003-07-04 | 2005-01-27 | Ricoh Co Ltd | Temperature detection apparatus, fixing device, imaging forming apparatus, and temperature detecting apparatus |
| US7079782B2 (en) * | 2004-03-22 | 2006-07-18 | Kabushiki Kaisha Toshiba | Fuser and temperature control method |
| US7212761B2 (en) | 2004-03-22 | 2007-05-01 | Kabushiki Kaisha Toshiba | Fuser and temperature control method |
| JP2007226003A (en) * | 2006-02-24 | 2007-09-06 | Konica Minolta Business Technologies Inc | Image forming apparatus |
| JP2012048131A (en) * | 2010-08-30 | 2012-03-08 | Ricoh Co Ltd | Heat fixing device and image forming apparatus equipped with the same |
| US9052668B2 (en) | 2013-02-05 | 2015-06-09 | Ricoh Company, Limited | Image forming apparatus, sensing method, and recording medium |
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