JP2007121955A - Fixing heater, heating device, and image forming apparatus - Google Patents

Fixing heater, heating device, and image forming apparatus Download PDF

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JP2007121955A
JP2007121955A JP2005317487A JP2005317487A JP2007121955A JP 2007121955 A JP2007121955 A JP 2007121955A JP 2005317487 A JP2005317487 A JP 2005317487A JP 2005317487 A JP2005317487 A JP 2005317487A JP 2007121955 A JP2007121955 A JP 2007121955A
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heat
insulating substrate
heating
fixing heater
heat radiation
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Masanori Fukushima
正徳 福島
Yukiko Fujikawa
由紀子 藤川
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Toshiba Lighting and Technology Corp
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Harison Toshiba Lighting Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a fixing heater capable of causing an insulation substrate having heat generating resistors thereon to efficiently generate heat at low costs and also capable of preventing crack or breakage. <P>SOLUTION: The heat generating resistors 121 to 123, made of silver-palladium or the like, which generate heat by supply of power, and power supply electrode parts 14 to 16, made of silver platinum or the like, whose low resistance value per unit area is low and which is less likely cause a heat generation phenomenon even if power is supplied are formed on one face of the long flat plate-like insulation substrate 11, made of aluminum nitride or the like, which has high heat conductivity characteristics. An overcoat layer 17 is formed on the heat generating resistors 121 to 123. Heat dissipation patterns 181 and 182 are formed on parts that generate heat most intensely when power is suddenly supplied to the face of the insulation substrate 11, which face is opposite to the heat generating resistors 121 to 123, by using a material whose heat conductivity is higher than that of the heat generating substrate 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、情報機器、家電製品や製造設備などの小型機器類に装着されて用いられる薄型の定着ヒータおよびこの定着ヒータを実装したプリンタ、複写機やファクシミリなどの加熱装置ならびにこの加熱装置を用いた画像形成装置に関する。   The present invention relates to a thin fixing heater that is used by being mounted on small equipment such as information equipment, home appliances, and manufacturing equipment, a heating device such as a printer, a copying machine, and a facsimile machine equipped with the fixing heater, and the heating device. The present invention relates to an image forming apparatus.

従来の厚膜印刷による定着ヒータは、発熱体を形成した面とは反対の面の略全面に基板よりも熱伝導性の高い物質でパターンを形成している。（例えば、特許文献１）
特開平９−１６３０６号公報 In a conventional fixing heater by thick film printing, a pattern is formed on a substantially entire surface opposite to a surface on which a heating element is formed with a material having higher thermal conductivity than that of a substrate. (For example, Patent Document 1)
Japanese Patent Laid-Open No. 9-16306

上記した特許文献１の技術は、発熱抵抗体パターンが形成された面とは反対の絶縁基板の略全面に熱伝導性の高いパターンを形成しているため、発熱抵抗体の温度勾配が緩和され、絶縁基板に加わる熱応力が小さく抑えられ、ひびや割れの発生を抑えられることができる。しかし、絶縁基板の略全面にパターンを形成することは形成する面積が広くなるため、コストが高くなる問題がある。   In the technique of Patent Document 1 described above, since a pattern having high thermal conductivity is formed on substantially the entire surface of the insulating substrate opposite to the surface on which the heating resistor pattern is formed, the temperature gradient of the heating resistor is alleviated. Further, the thermal stress applied to the insulating substrate can be suppressed to be small, and the occurrence of cracks and cracks can be suppressed. However, forming a pattern on substantially the entire surface of the insulating substrate has a problem in that the cost increases because the area to be formed increases.

この発明の目的は、安価なコストで熱効率を良くすることができるとともに、ひびや割れの発生を抑えることのできる定着ヒータ、この定着ヒータを用いた加熱装置、この加熱装置を用いた画像形成装置を提供することにある。   An object of the present invention is to provide a fixing heater capable of improving thermal efficiency at a low cost and suppressing the occurrence of cracks and cracks, a heating device using the fixing heater, and an image forming apparatus using the heating device Is to provide.

上記した課題を解決するために、この発明の定着ヒータは、窒化アルミニウム等の高熱伝導特性を有する長尺平板状の絶縁基板と、前記絶縁基板の一面に形成された発熱抵抗体と、前記発熱抵抗体に電力を供給するために形成された給電用電極部と、前記発熱抵抗体を覆うように配置されたオーバーコート層と、前記給電用電極部から電力が供給された場合に、前記発熱抵抗体の他の部分より高い熱を発する部分の前記絶縁基板の裏面に、前記絶縁基板より熱伝導率の高い材料で形成された放熱パターンとを具備したことを特徴とする。   In order to solve the above-described problems, a fixing heater of the present invention includes a long flat insulating substrate having high thermal conductivity such as aluminum nitride, a heating resistor formed on one surface of the insulating substrate, and the heat generation. When the power is supplied from the power supply electrode portion formed to supply power to the resistor, the overcoat layer disposed so as to cover the heating resistor, and the power supply electrode portion, the heat generation A heat radiation pattern formed of a material having a higher thermal conductivity than the insulating substrate is provided on the back surface of the insulating substrate in a portion that generates heat higher than other portions of the resistor.

この発明によれば、厚膜印刷により形成された定着ヒータの暴走時に破壊までの時間を長くすることでヒータ破壊前に安全回路が確実に作動する時間を稼ぐことで、周辺の部品等含めて発煙、発火等を防止させることが可能となる。   According to the present invention, by increasing the time until breakdown when the fixing heater formed by thick film printing runs out of control, the time required for the safety circuit to operate reliably before the heater breaks down, including peripheral components, etc. Smoke, fire, etc. can be prevented.

以下、この発明を実施するための最良の形態について、図面を参照しながら詳細に説明する。   Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

図１、図２は、この発明の定着ヒータの第１の実施形態について説明するためのもので、図１（ａ）は表面図、図１（ｂ）は図１（ａ）の裏面図である。
図１において、１１は、耐熱、電気絶縁性材料の例えばアルミナ（Ａｌ２Ｏ３）、窒化アルミニウム（ＡｌＮ）等の電気絶縁性を有する高剛性のセラミック等の基材で高い熱伝導性の短冊状絶縁基板である。１２１〜１２３は、絶縁基板１１の表面側の長手方向に沿って平行に形成されたＡｇ（銀）・Ｐｄ（パラジウム）をはじめとする銀系材料や、ルテニウム系、炭素系等などの発熱体ペーストをスクリーン印刷、高温で焼成し所定の抵抗値を有する膜厚が１０μｍ程度の帯状の発熱抵抗体である。 1 and 2 are diagrams for explaining a first embodiment of the fixing heater according to the present invention. FIG. 1 (a) is a front view, and FIG. 1 (b) is a rear view of FIG. 1 (a). is there.
In FIG. 1, reference numeral 11 denotes a heat-resistant, electrically insulating material such as alumina (Al 2 O 3 ), aluminum nitride (AlN), or other highly rigid ceramic base material having high thermal conductivity. Insulated substrate. 121 to 123 are silver-based materials such as Ag (silver) and Pd (palladium) formed in parallel along the longitudinal direction of the surface side of the insulating substrate 11, and heating elements such as ruthenium-based and carbon-based materials. This is a belt-like heating resistor having a film thickness of about 10 μm having a predetermined resistance value obtained by screen printing and baking at a high temperature.

１３は、発熱抵抗体１２１〜１２３それぞれ一端の一部を重層した銀系の導体ペーストを焼成して形成した接続部である。１４は、発熱抵抗体１２１，１２３のそれぞれの他端と一部が重層形成されたＡｇ、Ａｇ／Ｐｔ、Ａｇ／Ｐｄ合金等のいずれかを主体とする電極ペーストをスクリーン印刷、焼成して形成された給電用の電極である。１５は、発熱抵抗体１２２の他端と一部が重層形成されたＡｇ、Ａｇ／Ｐｔ、Ａｇ／Ｐｄ合金等のいずれかを主体とする電極ペーストをスクリーン印刷、焼成して形成された給電用の電極である。１６は、接続部１３の一部を重層形成したＡｇ、Ａｇ／Ｐｔ、Ａｇ／Ｐｄ合金等のいずれかを主体とする電極ペーストをスクリーン印刷、焼成して形成された給電用の電極である。   Reference numeral 13 denotes a connection portion formed by firing a silver-based conductor paste in which a part of one end of each of the heating resistors 121 to 123 is overlaid. 14 is formed by screen-printing and baking an electrode paste mainly composed of Ag, Ag / Pt, Ag / Pd alloy or the like in which the other end and a part of each of the heating resistors 121 and 123 are formed in layers. It is the electrode for electric power feeding performed. 15 is a power supply formed by screen printing and baking an electrode paste mainly composed of Ag, Ag / Pt, Ag / Pd alloy or the like in which the other end and a part of the heating resistor 122 are layered. Electrode. Reference numeral 16 denotes a power feeding electrode formed by screen printing and baking an electrode paste mainly composed of any one of Ag, Ag / Pt, Ag / Pd alloy and the like in which a part of the connection portion 13 is formed in a multilayer.

電極１４〜１６を残した発熱抵抗体１２１〜１２３および接続部上は、ガラスペーストをスクリーン印刷、焼成して電気的、機械的、化学的な保護を行うとともに摺動面ともなるオーバーコート層１７で覆われている。   On the heating resistors 121 to 123 and the connection portions where the electrodes 14 to 16 are left, an overcoat layer 17 that screen-prints and fires a glass paste to provide electrical, mechanical, and chemical protection and also serves as a sliding surface. Covered with.

図２に示すように、発熱抵抗体１２１，１２３はそれぞれの広い幅ｄ１１に比べて長手方向両側の一部に狭い幅ｄ１２がそれぞれ形成してある。また、発熱抵抗体１２２にも中央部の広い幅ｄ２１に比べて長手方向両側の一部に狭い幅ｄ２２が形成してある。発熱抵抗体１２１，１２３が通電されたときの狭い幅ｄ１２の部分は、これより広い幅ｄ１１より抵抗が高く発熱温度が高くなる。また、発熱抵抗体１２２が通電されたときの狭い幅ｄ２２の部分は、これより広い幅ｄ２１より抵抗が高く発熱温度が高くなる。   As shown in FIG. 2, the heating resistors 121 and 123 have narrow widths d12 formed at a part on both sides in the longitudinal direction as compared with the wide widths d11. Further, the heating resistor 122 also has a narrow width d22 on a part of both sides in the longitudinal direction as compared with the wide width d21 at the center. When the heating resistors 121 and 123 are energized, the portion of the narrow width d12 has a higher resistance and a higher heating temperature than the wider width d11. Further, the portion of the narrow width d22 when the heating resistor 122 is energized has a higher resistance and a higher heating temperature than the wider width d21.

狭い幅ｄ１２，ｄ２２を設けて通電時に抵抗が広い幅ｄ１１，ｄ２１に比べて高くする理由は、狭い幅ｄ１２，ｄ２２付近で発生した熱が接続部１３，電極１５，１６により熱が奪われこの部分の温度の低下を抑えるためである。   The reason why the narrow widths d12 and d22 are provided and the resistance when energized is higher than the wide widths d11 and d21 is that the heat generated in the vicinity of the narrow widths d12 and d22 is taken away by the connection parts 13 and the electrodes 15 and 16. This is to suppress the temperature drop of the portion.

図１のｕ−ｕ’断面を示す図３のように、発熱抵抗体１２１〜１２３等が形成された反対の絶縁基板１１面には、例えば、導電性成分がＡｇ、Ａｇ／Ｐｔ、Ａｇ／Ｐｄ等のいずれかで構成される表面に使用した電極１４等と同じ電極ペーストをスクリーン印刷、焼成して放熱パターン１８１，１８２が形成される。   As shown in FIG. 3 showing the uu ′ cross section of FIG. 1, for example, on the surface of the opposite insulating substrate 11 on which the heating resistors 121 to 123 and the like are formed, the conductive components are Ag, Ag / Pt, Ag / The same electrode paste as the electrode 14 used on the surface composed of any of Pd and the like is screen-printed and fired to form the heat radiation patterns 181 and 182.

発熱抵抗体１２１〜１２３は、予め紙に塗布されたトナーを定着するために発熱させるが、例えば使用の紙厚が薄いときは抵抗発熱体１２１，１２３を発熱させ、厚いときは抵抗発熱体１２１，１２３に加え発熱抵抗体１２２を発熱させるものである。発熱抵抗体１２１，１２３と発熱抵抗体１２２との切り換えは、使用する紙の状態に基づき図４に示すスイッチ４１をオン・オフさせることで可能である。   The heating resistors 121 to 123 generate heat in order to fix the toner previously applied to the paper. For example, when the used paper thickness is thin, the resistance heating elements 121 and 123 generate heat, and when the paper thickness is thick, the resistance heating body 121. , 123 causes the heating resistor 122 to generate heat. Switching between the heating resistors 121 and 123 and the heating resistor 122 can be performed by turning on and off the switch 41 shown in FIG. 4 based on the state of the paper to be used.

また、図１（ｂ）に示すように、発熱抵抗体１２１〜１２３が最も発熱する図４の狭い幅ｄ１２，ｄ２２が形成された図１（ａ）の一点鎖線Ｌ１，Ｌ２で囲む部分の反対の絶縁基板１１面には、例えば、導電性成分がＡｇ、Ａｇ／Ｐｔ、Ａｇ／Ｐｄ等のいずれかで構成される表面に使用した電極１４等と同じ電極ペーストをスクリーン印刷、焼成して放熱パターン１８１，１８２を形成する。   Also, as shown in FIG. 1 (b), opposite to the portion surrounded by the alternate long and short dash lines L1 and L2 in FIG. 1 (a) where the narrow widths d12 and d22 of FIG. 4 where the heating resistors 121 to 123 generate most heat are formed. On the surface of the insulating substrate 11, for example, the same electrode paste as the electrode 14 used on the surface where the conductive component is composed of Ag, Ag / Pt, Ag / Pd, or the like is screen-printed and baked to dissipate heat. Patterns 181 and 182 are formed.

ところで、発熱抵抗体１２１〜１２３が暴走すると狭い幅ｄ１２，ｄ２２部分の温度上昇が著しく広い幅ｄ１１，ｄ２１に比べて先に破壊することになる。   By the way, if the heating resistors 121 to 123 run away, the temperature rises in the narrow widths d12 and d22 will be destroyed earlier than the wide widths d11 and d21.

そこで、先に加熱される部分の裏面に熱伝導性が高いＡｇ、Ａｇ／Ｐｔ、Ａｇ／Ｐｄ等のいずれかの材料を用いて放熱パターン１８１，１８２を形成することで、絶縁基板１１に発生する温度差を効率よく緩和させ、絶縁基板１１の特定部分に加わる熱応力や熱衝撃を小さく押さえることで、絶縁基板１１のひびや割れの発生を防止できる。   Therefore, the heat radiation patterns 181 and 182 are formed on the back surface of the previously heated portion using any material such as Ag, Ag / Pt, or Ag / Pd having high thermal conductivity, thereby generating the insulating substrate 11. The occurrence of cracks and cracks in the insulating substrate 11 can be prevented by efficiently mitigating the temperature difference and suppressing the thermal stress and thermal shock applied to a specific portion of the insulating substrate 11 to be small.

図５は、この発明の定着ヒータの第２の実施形態について説明するためのもので、図１（ｂ）に相当する裏面図である。   FIG. 5 is a back view corresponding to FIG. 1B for explaining a second embodiment of the fixing heater of the present invention.

図１（ｂ）に示す放熱パターン１８１，１８２は、絶縁基板１１の短手方向に同一の幅としたが、この実施形態では、発熱抵抗体１２１〜１２３の狭い幅ｄ１２，ｄ２２の真裏に位置する部分は絶縁基板１１の短手方向に広く、絶縁基板１１の長手方向の中央側を短手方向に狭い放熱パターン５１，５２を形成したものである。この放熱パターン５１，５２は、図１（ｂ）の放熱パターン１８１，１８２と同様に、例えば導電性成分がＡｇ、Ａｇ／Ｐｔ、Ａｇ／Ｐｄ等のいずれかで構成されるペーストをスクリーン印刷、焼成して形成させたものである。   The heat radiation patterns 181 and 182 shown in FIG. 1B have the same width in the short direction of the insulating substrate 11, but in this embodiment, the heat radiation patterns 181 and 182 are positioned directly behind the narrow widths d12 and d22 of the heating resistors 121 to 123. The portion to be formed is wide in the short direction of the insulating substrate 11 and is formed with heat radiation patterns 51 and 52 narrow in the short direction at the center side in the longitudinal direction of the insulating substrate 11. The heat radiation patterns 51 and 52 are, for example, screen-printed with a paste composed of any one of Ag, Ag / Pt, Ag / Pd, etc., as in the heat radiation patterns 181 and 182 of FIG. It is formed by firing.

この実施形態では、発熱抵抗体１２１〜１２３が一番発熱する部分に先に発熱する部分の絶縁基板１１の中央部側に、絶縁基板１１の短手方向に狭く放熱パターン５１，５２が形成されているため、先に加熱される絶縁基板１１部分の熱と絶縁基板１１の短手方向の中央部に溜まる熱と一番発熱する熱と一緒により効率よく放出でき、絶縁基板１１に発生する温度差を緩和させ、絶縁基板１１に加わる熱応力や熱衝撃を小さく押さえ、絶縁基板１１のひびや割れの発生が防止できる。   In this embodiment, heat radiation patterns 51 and 52 are formed narrow in the short direction of the insulating substrate 11 on the central portion side of the insulating substrate 11 where the heat generating resistors 121 to 123 generate heat first. Therefore, the heat generated in the insulating substrate 11 can be more efficiently released together with the heat of the insulating substrate 11 heated first, the heat accumulated in the central portion of the insulating substrate 11 in the short side direction, and the heat generated most. The difference can be alleviated, the thermal stress and thermal shock applied to the insulating substrate 11 can be suppressed, and the occurrence of cracks and cracks in the insulating substrate 11 can be prevented.

図６は、この発明の定着ヒータの第３の実施形態について説明するためのもので、図１（ｂ）に相当する裏面図である。   FIG. 6 is a back view corresponding to FIG. 1B for explaining a third embodiment of the fixing heater of the present invention.

図５の放熱パターン５１，５２では、絶縁基板１１の短手方向に広い部分と狭い部分を形成したが、この実施形態では、図５の放熱パターン５１，５２の絶縁基板１１の短手方向に広い部分から狭い部分まで漸次狭くなる放熱パターン６１，６２を形成したものである。放熱パターン６１，６２は、図５の放熱パターン５１，５２と同様の材料と方法で形成されるものである。   In the heat radiation patterns 51 and 52 of FIG. 5, wide portions and narrow portions are formed in the short direction of the insulating substrate 11, but in this embodiment, the heat dissipation patterns 51 and 52 of FIG. The heat radiation patterns 61 and 62 gradually narrow from a wide part to a narrow part are formed. The heat radiation patterns 61 and 62 are formed by the same material and method as the heat radiation patterns 51 and 52 of FIG.

この実施形態によれば、発熱抵抗体１２１〜１２３が一番発熱する部分に先に発熱する部分の絶縁基板１１の長手方向の端部から絶縁基板１１の長手の中央部に向かって漸次狭くなる放熱パターン６１，６２が形成されているため、先に加熱される絶縁基板１１部分の熱と絶縁基板１１の短手方向の中央部に溜まる熱と一番発熱する熱と一緒により効率よく放出でき、絶縁基板１１に発生する温度差を緩和させ、絶縁基板１１に加わる熱応力や熱衝撃を小さく押さえ、絶縁基板１１のひびや割れの発生が防止できる。   According to this embodiment, the heating resistors 121 to 123 gradually become narrower from the end in the longitudinal direction of the insulating substrate 11 at the portion that generates heat first than the portion that generates the heat most toward the central portion of the insulating substrate 11 in the longitudinal direction. Since the heat radiation patterns 61 and 62 are formed, the heat of the insulating substrate 11 part heated first, the heat accumulated in the central portion of the insulating substrate 11 in the short direction, and the heat generated most can be released more efficiently. The temperature difference generated in the insulating substrate 11 can be relaxed, the thermal stress and thermal shock applied to the insulating substrate 11 can be reduced, and the occurrence of cracks and cracks in the insulating substrate 11 can be prevented.

図７、図８は、この発明の定着ヒータの第４の実施形態について説明するためのもので、図７は図１（ｂ）に相当する裏面図で、図８は図７のｗ−ｗ’断面図である。   FIGS. 7 and 8 are for explaining a fourth embodiment of the fixing heater according to the present invention. FIG. 7 is a rear view corresponding to FIG. 1B, and FIG. 'Cross section.

この実施形態は、発熱抵抗体１２１〜１２３の狭い幅ｄ１２，ｄ２２の真裏に位置する絶縁基板１１に放熱パターン７１，７２をそれぞれ形成するとともに、発熱抵抗体１２１〜１２３の真裏に位置する絶縁基板１１上に放熱パターン７１，７２と一体形成された３条の結合パターン７３１〜７３３を形成したものである。放熱パターン７１，７２、結合パターン７３１〜７３３は、第１の実施形態と同様の材料、方法により形成されるものである。   In this embodiment, the heat radiation patterns 71 and 72 are respectively formed on the insulating substrate 11 positioned directly behind the narrow widths d12 and d22 of the heating resistors 121 to 123, and the insulating substrate positioned directly behind the heating resistors 121 to 123. 11, three joint patterns 731 to 733 integrally formed with the heat radiation patterns 71 and 72 are formed. The heat radiation patterns 71 and 72 and the coupling patterns 731 to 733 are formed by the same material and method as in the first embodiment.

この場合、第１の実施形態の放熱パターン１８１，１８２の有する効果に加え、絶縁基板１１の長手方向の中央部にこもりがちな熱を、結合パターン７３１〜７３３を通して拡散させることができる。このため、絶縁基板１１全体の温度の均一化に寄与することが可能となる。   In this case, in addition to the effects of the heat radiation patterns 181 and 182 of the first embodiment, heat that tends to stay in the central portion in the longitudinal direction of the insulating substrate 11 can be diffused through the coupling patterns 731 to 733. For this reason, it becomes possible to contribute to the uniform temperature of the whole insulating substrate 11.

図９、図１０は、この発明の定着ヒータの第５の実施形態について説明するためのもので、図９は図１（ｂ）に相当する裏面図で、図１０（ａ）は図９のｘ−ｘ’断面図、図１０（ｂ）は図９のｙ−ｙ’断面図、図１０（ｃ）は図９のｚ−ｚ’断面図である。   FIGS. 9 and 10 are for explaining a fifth embodiment of the fixing heater of the present invention. FIG. 9 is a back view corresponding to FIG. 1 (b), and FIG. 10 (a) is FIG. xx ′ sectional view, FIG. 10B is a yy ′ sectional view of FIG. 9, and FIG. 10C is a zz ′ sectional view of FIG. 9.

この実施形態は、第４の実施形態での放熱パターン７１との接合部分の結合パターン７３１〜７３３にそれぞれ幅広部７４１〜７４３を、放熱パターン７２との接合部分の結合パターン７３１〜７３３にそれぞれ幅広部７５１〜７５３をそれぞれ形成したものである。   In this embodiment, the wide portions 741 to 743 are widened in the joint patterns 731 to 733 at the joint portions with the heat radiation pattern 71 in the fourth embodiment, and the wide joint portions 731 to 733 in the joint portions with the heat radiation pattern 72 are wide. The parts 751 to 753 are respectively formed.

この場合、発熱抵抗体１２１〜１２３が加熱すると、絶縁基板１１の短手方向の端より絶縁基板１１中央により熱が溜まることにより発生する温度差を結合パターン７３１〜７３３で防止することともに、幅広部７４１〜７４３、７５１〜７５３が放熱パターン７１，７２と結合パターン７３１〜７３３の熱の緩衝的な役割を果たし、絶縁基板１１に発生する温度差を効率よく緩和させ、絶縁基板１１に加わる熱応力や熱衝撃を小さく押さえることができ、絶縁基板１１のひびや割れの発生が防止できる。   In this case, when the heating resistors 121 to 123 are heated, the bonding patterns 731 to 733 prevent the temperature difference generated by heat from being accumulated in the center of the insulating substrate 11 from the short-side end of the insulating substrate 11 and wide. The portions 741 to 743 and 751 to 753 play a role of buffering heat between the heat radiation patterns 71 and 72 and the coupling patterns 731 to 733, efficiently relieve the temperature difference generated in the insulating substrate 11, and heat applied to the insulating substrate 11. Stress and thermal shock can be suppressed to a small level, and the occurrence of cracks and cracks in the insulating substrate 11 can be prevented.

図１１は、この発明の定着ヒータの第６の実施形態について説明するための、図１（ｂ）に相当する裏面図である。   FIG. 11 is a back view corresponding to FIG. 1B for explaining a sixth embodiment of the fixing heater of the present invention.

この実施形態は、第５の実施形態に放熱パターンと絶縁基板１１の短手方向の漸次狭くする第３の実施形態とを組み合わせたものである。この場合、絶縁基板１１中央により熱が溜まることによる温度差を解消するとともに、幅広部７４１〜７４３、７５１〜７５３が放熱パターン７１，７２と結合パターン７３１〜７３３の熱の緩衝的な役割を果す部分が絶縁基板１１に発生する温度差をより効率よく緩和させ、絶縁基板１１に加わる熱応力や熱衝撃をより小さく押さえることができ、絶縁基板１１のひびや割れの発生が防止できる。   This embodiment is a combination of the fifth embodiment and the third embodiment in which the heat dissipation pattern and the insulating substrate 11 are gradually narrowed in the short direction. In this case, the temperature difference due to heat accumulation at the center of the insulating substrate 11 is eliminated, and the wide portions 741 to 743 and 751 to 753 play a role of buffering heat between the heat radiation patterns 71 and 72 and the coupling patterns 731 to 733. The temperature difference generated by the portion in the insulating substrate 11 can be more efficiently mitigated, the thermal stress and thermal shock applied to the insulating substrate 11 can be suppressed to a smaller level, and the occurrence of cracks and cracks in the insulating substrate 11 can be prevented.

上記した定着ヒータの第１〜第６の実施形態では、特に温度の高くなる部分にのみ熱応力や熱衝撃を抑える放熱パターンを施したことから必要とする熱伝導のよい材料の使用を抑えて廉価にすることができる。   In the first to sixth embodiments of the fixing heater described above, since a heat radiation pattern that suppresses thermal stress and thermal shock is applied only to a portion where the temperature is particularly high, the use of a material having a good thermal conductivity is suppressed. It can be cheap.

上記した各実施形態では、用紙の厚さが厚いか薄いかにより発熱抵抗体１２１，１２３を加熱するか、発熱抵抗体１２１〜１２３を加熱するかにしたが、用紙の幅が広いか狭いかの場合にも同様の考えが適用できる。この場合、図２の発熱抵抗体１２２はそのままとし、発熱抵抗体１２１，１２３の狭い幅ｄ１２を幅ｄ１１よりも広くする。これにより、使用の用紙の幅が狭いときは抵抗発熱体１２１，１２３を発熱させ、広いときは抵抗発熱体１２１，１２３に加えて抵抗発熱体１２２を発熱させるとよい。   In each of the embodiments described above, the heating resistors 121 and 123 are heated or the heating resistors 121 to 123 are heated depending on whether the paper is thick or thin, but whether the paper is wide or narrow. The same idea can be applied to the case. In this case, the heating resistor 122 in FIG. 2 is left as it is, and the narrow width d12 of the heating resistors 121 and 123 is made wider than the width d11. Accordingly, the resistance heating elements 121 and 123 may generate heat when the width of the used paper is narrow, and the resistance heating elements 122 may generate heat in addition to the resistance heating elements 121 and 123 when they are wide.

また、発熱抵抗体は３本の例を挙げたが、少なくとも１本でもこの発明の効果を享受することができる。要は、発熱抵抗体の発熱温度が高くなる絶縁基板の裏面付近に熱伝導性の高い放熱パターンが形成されていればよい。   In addition, although three examples of the heating resistors are given, at least one heating resistor can enjoy the effect of the present invention. In short, it is only necessary that a heat radiation pattern with high thermal conductivity be formed in the vicinity of the back surface of the insulating substrate where the heat generation temperature of the heat generating resistor is high.

次に、図１２を参照し、上記した定着ヒータを加熱装置２００に実装した場合の、この発明の加熱装置の一実施形態について説明する。図中ヒータ１００については、図１、図２で説明した定着ヒータであり、同一部分には同一の符号を付してその説明は省略する。   Next, with reference to FIG. 12, an embodiment of the heating device of the present invention when the fixing heater described above is mounted on the heating device 200 will be described. The heater 100 in the figure is the fixing heater described with reference to FIGS. 1 and 2, and the same portions are denoted by the same reference numerals and description thereof is omitted.

図１２において、２０１は回転軸２０２で回転自在に回転される加圧ローラで、その表面に耐熱性弾性材料たとえばシリコーンゴム層２０３が嵌合してある。加圧ローラ２０１の回転軸２０２と対向してヒータ１００が、並置して図示しない基台内に取り付けられている。   In FIG. 12, reference numeral 201 denotes a pressure roller that is rotated by a rotating shaft 202, and a heat-resistant elastic material such as a silicone rubber layer 203 is fitted on the surface thereof. The heater 100 is mounted in parallel in a base (not shown) so as to face the rotating shaft 202 of the pressure roller 201.

ヒータ１００の周囲にはポリイミド樹脂等の耐熱性のシートからなるエンドレスのロール状の定着フィルム２０４が循環自在に巻装されており、発熱抵抗体１２１〜１２３が形成された絶縁基板１１のオーバーコート層１７の表面は、この定着フィルム２０４を介して加圧ローラ２０１のシリコーンゴム層２０３と弾接している。   Around the heater 100, an endless roll-shaped fixing film 204 made of a heat-resistant sheet such as a polyimide resin is circulated, and an overcoat of the insulating substrate 11 on which the heating resistors 121 to 123 are formed. The surface of the layer 17 is in elastic contact with the silicone rubber layer 203 of the pressure roller 201 through the fixing film 204.

図１２の加熱装置２００において、ヒータ１００は電極１４〜１６に接触したりん青銅板等に銀メッキを施した弾性が付与された図示しないコネクタを通じて通電され、発熱抵抗体１２１〜１２３で発生させた熱が絶縁基板１１、オーバーコート層１７と伝わり、オーバーコート層１７上の定着フィルム２０４面とシリコーンゴム層２０３との間で、トナー像Ｔ１がまず定着フィルム２０４を介してヒータ１００により加熱溶融され、少なくともその表面部は融点を大きく上回り完全に軟化溶融する。この後、加圧ローラ２０１の用紙排出側では複写用紙Ｐがヒータ１００から離れ、トナー像Ｔ２は自然放熱して再び冷却固化し、定着フィルム２０４も複写用紙Ｐから離反される。   In the heating device 200 of FIG. 12, the heater 100 is energized through a connector (not shown) in which a silver-plated elasticity is applied to a phosphor bronze plate or the like that is in contact with the electrodes 14 to 16, and is generated by the heating resistors 121 to 123. Heat is transferred to the insulating substrate 11 and the overcoat layer 17, and the toner image T 1 is first heated and melted by the heater 100 through the fixing film 204 between the surface of the fixing film 204 on the overcoat layer 17 and the silicone rubber layer 203. At least the surface portion greatly exceeds the melting point and is completely softened and melted. Thereafter, on the paper discharge side of the pressure roller 201, the copy paper P is separated from the heater 100, the toner image T2 is naturally radiated and cooled and solidified again, and the fixing film 204 is also separated from the copy paper P.

このように、トナー像Ｔ１は一旦完全に軟化溶融された後、加圧ローラ２０１の用紙排出側で再び冷却されることから、トナー像Ｔ２の凝縮力は非常に大きくなものとなっている。   As described above, the toner image T1 is once completely softened and melted and then cooled again on the paper discharge side of the pressure roller 201, so that the condensing force of the toner image T2 is very large.

この加熱装置２００では、ヒータ１００の上流側あるいは下流側に形成したオーバーコート層１７によって定着フィルム２０４の走行の軌跡を変更することが可能となる。これにより、定着フィルム２０４とヒータ１００の端部の角にフィルムがあたることを防ぐことができ、フィルムにキズが入ったりダメージを与えたりすることなく良好な定着性が得られる。また、フィルムの回転が良好になりスリップも防止できる。   In the heating apparatus 200, the trajectory of the fixing film 204 can be changed by the overcoat layer 17 formed on the upstream side or the downstream side of the heater 100. As a result, the film can be prevented from hitting the corners of the fixing film 204 and the end of the heater 100, and good fixability can be obtained without causing scratches or damage to the film. Further, the rotation of the film becomes good and slipping can be prevented.

次に、図１３を参照して、この発明に係る定着ヒータ、この定着ヒータを用いた加熱装置を搭載した複写機を例とした、この発明の画像形成装置について説明する。図中、加熱装置２００の部分は、上記した説明と同じであり、同一部分には同一の符号を付し、その説明は省略する。   Next, an image forming apparatus according to the present invention will be described with reference to FIG. 13, taking as an example a copying machine equipped with a fixing heater according to the present invention and a heating device using the fixing heater. In the figure, the part of the heating device 200 is the same as described above, and the same reference numerals are given to the same parts, and the description thereof is omitted.

図１３において、３０１は複写機３００の筐体、３０２は筐体３０１の上面に設けられたガラス等の透明部材からなる原稿載置台で、矢印Ｙ方向に往復動作させて原稿Ｐ１を走査する。   In FIG. 13, reference numeral 301 denotes a casing of the copying machine 300, and 302 an original placement table made of a transparent member such as glass provided on the upper surface of the casing 301, which scans the original P <b> 1 by reciprocating in the arrow Y direction.

筐体３０１内の上方向には光照射用のランプと反射鏡とからなる照明装置３０２が設けられており、この照明装置３０２により照射された原稿Ｐ１からの反射光源が短焦点小径結像素子アレイ３０３によって感光ドラム３０４上スリット露光される。なお、この感光ドラム３０４は矢印方向に回転する。   An illuminating device 302 including a light irradiation lamp and a reflecting mirror is provided in the upper direction in the housing 301, and a reflected light source from the document P1 irradiated by the illuminating device 302 is a short focus small diameter imaging element. A slit exposure is performed on the photosensitive drum 304 by the array 303. The photosensitive drum 304 rotates in the direction of the arrow.

また、３０５は帯電器で、例えば酸化亜鉛感光層あるいは有機半導体感光層が被覆された感光ドラム３０４上に一様に帯電を行う。この帯電器３０５により帯電された感光ドラム３０４には、結像素子アレイ３０３によって画像露光が行われた静電画像が形成される。この静電画像は、現像器３０６による加熱で軟化溶融する樹脂等からなるトナーを用いて顕像化される。   Reference numeral 305 denotes a charger that uniformly charges, for example, a photosensitive drum 304 coated with a zinc oxide photosensitive layer or an organic semiconductor photosensitive layer. An electrostatic image subjected to image exposure by the imaging element array 303 is formed on the photosensitive drum 304 charged by the charger 305. This electrostatic image is visualized using toner made of a resin that softens and melts when heated by the developing device 306.

カセット３０７内に収納されている複写用紙Ｐは、給送ローラ３０８と感光ドラム３０４上の画像と同期するタイミングをとって上下方向で圧接して回転される対の搬送ローラ３０９によって、感光ドラム３０４上に送り込まれる。そして、転写放電器３１０によって感光ドラム３０４上に形成されているトナー像は複写用紙Ｐ上に転写される。   The copy paper P stored in the cassette 307 is rotated by a pair of conveying rollers 309 that are rotated in pressure contact with each other in synchronization with the feeding roller 308 and the image on the photosensitive drum 304. Sent to the top. The toner image formed on the photosensitive drum 304 is transferred onto the copy paper P by the transfer discharger 310.

その後、感光ドラム３０４上から離れた用紙Ｐは、搬送ガイド３１１によって加熱装置２００に導かれて加熱定着処理された後に、トレイ３１２内に排出される。なお、トナー像が転写された後、感光ドラム３０４上の残留トナーはクリーナ３１３を用いて除去される。   Thereafter, the paper P that is separated from the photosensitive drum 304 is guided to the heating device 200 by the conveyance guide 311 and subjected to a heat fixing process, and then is discharged into the tray 312. After the toner image is transferred, residual toner on the photosensitive drum 304 is removed using a cleaner 313.

加熱装置２００は複写用紙Ｐの移動方向と直交する方向に、この複写機３００が複写できる最大判用紙の幅（長さ）に合わせた有効長、すなわち最大判用紙の幅（長さ）より長い発熱抵抗体１２１〜１２３を延在させて定着ヒータ１００の加圧ローラ２０１が設けられている。   The heating device 200 is longer in the direction orthogonal to the moving direction of the copy paper P than the effective length corresponding to the width (length) of the maximum size paper that can be copied by the copier 300, that is, longer than the width (length) of the maximum size paper. A pressure roller 201 of the fixing heater 100 is provided by extending the heating resistors 121 to 123.

そして、定着ヒータ１００と加圧ローラ２０１との間を送られる用紙Ｐ上の未定着トナー像Ｔ１は、発熱抵抗体１２１〜１２３の熱を受け溶融して複写用紙Ｐ面上に文字、英数字、記号、図面等の複写像を現出させる。   The unfixed toner image T1 on the paper P sent between the fixing heater 100 and the pressure roller 201 is melted by receiving heat from the heating resistors 121 to 123, and characters and alphanumeric characters are printed on the surface of the copy paper P. A copy image such as a symbol or a drawing is displayed.

この実施形態では、定着フィルムとの摺動性の阻害の防止や良好な定着性を図ることができるヒータ１００よる加熱装置２００を用いた複写機３００を実現できる。   In this embodiment, it is possible to realize a copying machine 300 using the heating device 200 by the heater 100 that can prevent the slidability with the fixing film from being hindered and can achieve good fixing properties.

なお、この発明は上記した実施形態に限定されるものではない。例えば、オーバーコート材は相対する定着フィルムの材質やその他条件によって変える必要があるため特定はできないが、定着フィルムが樹脂の場合、オーバーコート層はガラス、定着フィルムが金属の場合オーバーコート層は樹脂を組み合わせるのが望ましい。この樹脂は一般的に摺動性に優れるとされる材料、ポリアミド(ＰＡ)、ポリアセタール(ＰＯＭ)、ポリテトラフルオロエチレン(ＰＴＦＥ)、およびポリフェニレンサルファイド、エラストマー系、ポリオレフィン系、フッ素等があり、基本的にはどれを使用しても良いが耐熱性から弾性に富むＰＩ(ポリイミド)、ＰＡＩ(ポリアミドイミド)等のイミド系が好ましいが、硬度が低すぎると樹脂被膜の方が削れてしまうため、３Ｈ以上の硬度は必要である。   The present invention is not limited to the embodiment described above. For example, the overcoat material needs to be changed depending on the material of the fixing film and other conditions, but it cannot be specified. If the fixing film is a resin, the overcoat layer is glass, and if the fixing film is a metal, the overcoat layer is It is desirable to combine. This resin includes materials that are generally excellent in slidability, such as polyamide (PA), polyacetal (POM), polytetrafluoroethylene (PTFE), polyphenylene sulfide, elastomer, polyolefin, fluorine, etc. Any of these may be used, but PI (polyimide) and PAI (polyamideimide), which are rich in elasticity from heat resistance, are preferred, but if the hardness is too low, the resin film will be scraped off, A hardness of 3H or higher is necessary.

また、発熱抵抗体は便宜的に２本折り返す構成としているが、発熱抵抗体構成は特に限定するものではない。   Moreover, although the heating resistor is configured to be folded back twice for convenience, the heating resistor configuration is not particularly limited.

定着ヒータの用途としては、複写機等の画像形成装置の定着用に用いたが、これに限らず、家庭用の電気製品、業務用や実験用の精密機器や化学反応用の機器等に装着して加熱や保温の熱源としても使用できる。   The fixing heater is used for fixing image forming devices such as copiers, but is not limited to this, and is installed in household electrical appliances, precision instruments for business use and experiments, equipment for chemical reactions, etc. It can also be used as a heat source for heating and heat insulation.

この発明の定着ヒータに関する第１の実施形態について説明するための（ａ）は表面図、（ｂ）は裏面図。BRIEF DESCRIPTION OF THE DRAWINGS (a) for demonstrating 1st Embodiment regarding the fixing heater of this invention is a front view, (b) is a back view. 図１の抵抗発熱体をより詳細に説明するための説明図。Explanatory drawing for demonstrating the resistance heating element of FIG. 1 in detail. 図１のｕ−ｕ’断面図。U-u 'sectional drawing of FIG. 図１の抵抗発熱体の切り換えについて説明するための説明図。Explanatory drawing for demonstrating switching of the resistance heating element of FIG. この発明の定着ヒータに関する第２の実施形態について説明するための裏面図。FIG. 6 is a back view for explaining a second embodiment relating to the fixing heater of the present invention. この発明の定着ヒータに関する第３の実施形態について説明するための裏面図。FIG. 9 is a back view for explaining a third embodiment relating to the fixing heater of the present invention. この発明の定着ヒータに関する第４の実施形態について説明するための裏面図。The back view for demonstrating 4th Embodiment regarding the fixing heater of this invention. 図７のｗ−ｗ’断面図。FIG. 8 is a cross-sectional view taken along w-w ′ of FIG. 7. この発明の定着ヒータに関する第５の実施形態について説明するための裏面図。FIG. 9 is a back view for explaining a fifth embodiment relating to the fixing heater of the present invention. （ａ）は図９のｘ−ｘ’断面図、（ｂ）は図９のｙ−ｙ’断面図、（ｃ）は図９のｚ−ｚ’断面図。9A is an x-x ′ sectional view of FIG. 9, FIG. 9B is a y-y ′ sectional view of FIG. 9, and FIG. 9C is a z-z ′ sectional view of FIG. 9. この発明の定着ヒータに関する第６の実施形態について説明するための裏面図。FIG. 10 is a back view for explaining a sixth embodiment relating to the fixing heater of the present invention. この発明の加熱装置に関する一実施形態について説明するための説明図。Explanatory drawing for demonstrating one Embodiment regarding the heating apparatus of this invention. この発明の画像形成装置に関する一実施形態について説明するための説明図。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram for explaining an embodiment of an image forming apparatus according to the present invention;

符号の説明Explanation of symbols

１１ 絶縁基板
１２１〜１２３ 発熱抵抗体
１３ 接続部
１４〜１６ 電極
１７ オーバーコート層
１８１，１８２，４１，４２，５１，５２，６１，６２，７１，７２ 放熱パターン
ｄ１１，ｄ２１ 広い幅
ｄ１２，ｄ２２ 狭い幅
７３１〜７３３ 結合パターン
７４１〜７４３、７５１〜７５３ 幅広部
１００ 定着ヒータ
２００ 加熱装置
３００ 画像形成装置
11 Insulating substrate 121 to 123 Heating resistor 13 Connection portion 14 to 16 Electrode 17 Overcoat layer 181, 182, 41, 42, 51, 52, 61, 62, 71, 72 Heat radiation pattern d11, d21 Wide width d12, d22 Narrow Widths 731 to 733 Bond patterns 741 to 743, 751 to 753 Wide portion 100 Fixing heater 200 Heating device 300 Image forming apparatus

Claims (5)

窒化アルミニウム等の高熱伝導特性を有する長尺平板状の絶縁基板と、
前記絶縁基板の一面に形成された発熱抵抗体と、
前記発熱抵抗体に電力を供給するために形成された給電用電極部と、
前記発熱抵抗体を覆うように配置されたオーバーコート層と、
前記給電用電極部から電力が供給された場合に、前記発熱抵抗体の他の部分より高い熱を発する部分の前記絶縁基板の裏面に、前記絶縁基板より熱伝導率の高い材料で形成された放熱パターンとを具備したことを特徴とする定着ヒータ。 A long flat plate-like insulating substrate having high thermal conductivity such as aluminum nitride;
A heating resistor formed on one surface of the insulating substrate;
A feeding electrode portion formed to supply power to the heating resistor;
An overcoat layer disposed so as to cover the heating resistor;
When power is supplied from the power supply electrode portion, the back surface of the insulating substrate where heat is higher than other portions of the heating resistor is formed of a material having higher thermal conductivity than the insulating substrate. A fixing heater comprising a heat radiation pattern. 前記放熱パターンは、前記絶縁基板の長手方向の中央部側に向かい、前記絶縁基板の短手方向に広い幅と狭い幅を有するか、広い幅から漸次狭い幅としたことを特徴する請求項１記載の定着ヒータ。   2. The heat radiation pattern is directed toward a central portion in the longitudinal direction of the insulating substrate, and has a wide width and a narrow width in a short direction of the insulating substrate, or a gradually narrowing width from a wide width. The fixing heater as described. 前記放熱パターンは、前記発熱抵抗体の両端付近に、他の部分より高い熱を発する部分を形成し、該高い熱を発する部分の前記絶縁基板の裏面に、該絶縁基板より熱伝導率の高い材料でそれぞれ形成し、
前記放熱パターンは、前記発熱抵抗体の反対側に位置する部分の前記絶縁基板上で形成された結合パターンで一体的に結合してなることを特徴とする請求項１または２記載の定着ヒータ。 The heat radiation pattern has a portion that emits heat higher than other portions in the vicinity of both ends of the heat generating resistor, and a heat conductivity higher than that of the insulating substrate on the back surface of the insulating substrate of the portion that generates high heat. Each formed with material,
3. The fixing heater according to claim 1, wherein the heat radiation pattern is integrally coupled by a coupling pattern formed on the insulating substrate at a portion opposite to the heating resistor. 加熱ローラと、
前記加熱ローラに対向配置された発熱抵抗体が圧接された請求項１〜３のいずかに記載のヒータと、
前記ヒータと前記加圧ローラとの間を移動可能に設けられた定着フィルムとを具備したことを特徴とする加熱装置。 A heating roller;
The heater according to any one of claims 1 to 3, wherein a heating resistor disposed to face the heating roller is pressed.
A heating device comprising a fixing film movably provided between the heater and the pressure roller. 媒体に形成された静電潜像にトナーを付着させてこのトナーを用紙に転写して所定の画像を形成する形成手段と、
画像が形成された用紙を加圧ローラにより定着フィルムを介して前記定着ヒータに圧接しながら通過させることによって、トナーを定着するようにした請求項４記載の加熱装置とを具備したことを特徴とする画像形成装置。 Forming means for attaching a toner to an electrostatic latent image formed on a medium and transferring the toner to a sheet to form a predetermined image;
5. A heating apparatus according to claim 4, wherein the toner is fixed by passing a sheet on which an image is formed through a fixing film through a fixing film while being pressed against the fixing heater. Image forming apparatus.
JP2005317487A 2005-10-31 2005-10-31 Fixing heater, heating device, and image forming apparatus Withdrawn JP2007121955A (en)

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
JP2009064759A (en) * 2007-09-10 2009-03-26 Rohm Co Ltd Heater
KR20140089419A (en) 2011-11-15 2014-07-14 가부시키가이샤 미스즈 코우쿄우 Heater, and fixing device and drying device provided with same
US9829839B2 (en) 2012-11-21 2017-11-28 Canon Kabushiki Kaisha Image heating apparatus having an electric power shut-off member, thermal fuse, or thermal switch operable in response to an abnormal temperature rise
CN108957991A (en) * 2017-05-17 2018-12-07 佳能株式会社 Image heater, image forming apparatus and heater
CN109910775A (en) * 2017-12-12 2019-06-21 小岛冲压工业株式会社 Vehicle camera
EP4075202A1 (en) * 2021-04-12 2022-10-19 Toshiba Lighting & Technology Corporation Heater, and image forming apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009064759A (en) * 2007-09-10 2009-03-26 Rohm Co Ltd Heater
US8362401B2 (en) 2007-09-10 2013-01-29 Rohm Co., Ltd. Heater
KR20140089419A (en) 2011-11-15 2014-07-14 가부시키가이샤 미스즈 코우쿄우 Heater, and fixing device and drying device provided with same
US9829839B2 (en) 2012-11-21 2017-11-28 Canon Kabushiki Kaisha Image heating apparatus having an electric power shut-off member, thermal fuse, or thermal switch operable in response to an abnormal temperature rise
US10268145B2 (en) 2012-11-21 2019-04-23 Canon Kabushiki Kaisha Image heating apparatus having a plate-like heater and a heat conduction plate
CN108957991A (en) * 2017-05-17 2018-12-07 佳能株式会社 Image heater, image forming apparatus and heater
CN109910775A (en) * 2017-12-12 2019-06-21 小岛冲压工业株式会社 Vehicle camera
JP2019104378A (en) * 2017-12-12 2019-06-27 小島プレス工業株式会社 Vehicular imaging apparatus
JP7125261B2 (en) 2017-12-12 2022-08-24 小島プレス工業株式会社 camera for vehicle
US11485323B2 (en) 2017-12-12 2022-11-01 Kojima Industries Corporation Imaging apparatus for vehicle
EP4075202A1 (en) * 2021-04-12 2022-10-19 Toshiba Lighting & Technology Corporation Heater, and image forming apparatus

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