JPH09269688A - Fixing heater, fixing device, and image forming device - Google Patents
Fixing heater, fixing device, and image forming deviceInfo
- Publication number
- JPH09269688A JPH09269688A JP7769296A JP7769296A JPH09269688A JP H09269688 A JPH09269688 A JP H09269688A JP 7769296 A JP7769296 A JP 7769296A JP 7769296 A JP7769296 A JP 7769296A JP H09269688 A JPH09269688 A JP H09269688A
- Authority
- JP
- Japan
- Prior art keywords
- fixing
- high thermal
- layer
- fixing heater
- heat
- 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.)
- Abandoned
Links
Landscapes
- Control Of Resistance Heating (AREA)
- Resistance Heating (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ＯＡ機器，家庭
用電気機器や精密製造設備などの小形機器類に装着され
て用いられる薄形の定着ヒータと、この定着ヒータを実
装した複写機やファクシミリなどのトナー定着に用いら
れる定着装置ならびにこの定着装置を用いた画像形成装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin fixing heater which is used by being attached to small equipment such as office automation equipment, household electric equipment and precision manufacturing equipment, and a copying machine and a facsimile in which the fixing heater is mounted. The present invention relates to a fixing device used for fixing toner, and an image forming apparatus using the fixing device.
【０００２】[0002]
【従来の技術】一般に、電子式複写機においては、トナ
ー画像を形成した複写用紙を定着ヒータと加圧ローラと
の間を直接、または耐熱シートを介して間接に挟圧しな
がら通過させ、このヒータの加熱によって複写用紙上の
トナーを加熱，溶融し定着させるようになっている。2. Description of the Related Art In general, in an electronic copying machine, a copy sheet on which a toner image is formed is passed between a fixing heater and a pressure roller directly or indirectly via a heat-resistant sheet while being pressed. The toner on the copy paper is heated, melted and fixed by the heating.
【０００３】この種の従来の定着ヒータとしては例えば
図８（幅方向に沿う縦断面図）に示すように構成された
ものが実用化されている。この定着ヒータ１はアルミナ
（Ａｌ2 Ｏ3 ）セラミックスなどからなる図８中紙面の
表裏方向に細長い耐熱性・電気絶縁性基板２の表面２ａ
上に、例えば細長い帯状厚膜の抵抗発熱体３を厚膜印刷
等により形成し、この抵抗発熱体３に電気的に接続され
た一対の電極（図示せず）に、図示しないコネクタを介
して抵抗発熱体３に通電するようになっている。As this type of conventional fixing heater, for example, one having a structure as shown in FIG. 8 (longitudinal sectional view along the width direction) has been put into practical use. The fixing heater 1 is made of alumina (Al 2 O 3 ) ceramics or the like, and has a surface 2a of a heat-resistant / electrically insulating substrate 2 elongated in the front-back direction of the paper in FIG.
An elongated strip-shaped thick-film resistance heating element 3 is formed thereon by thick-film printing or the like, and a pair of electrodes (not shown) electrically connected to the resistance heating element 3 are connected via a connector (not shown). The resistance heating element 3 is energized.
【０００４】そして、抵抗発熱体３の外表面を、基板表
面２ａ上において、電気絶縁層かつ保護層であるガラス
質のオーバーコート層４により被覆して、耐摩耗性や耐
衝撃性などの機械的強度の向上と、硫化や酸化等からの
耐蝕保護と、このオーバーコート層４の頂面とフィルム
等を介して接触する回転自在の加圧ローラ等との電気的
絶縁を図っている。このオーバーコート層４の頂面上に
は例えばトナー像を形成した複写用紙Ｐを図中矢印に示
すようにｉｎからｏｕｔへ向けて抵抗発熱体３の幅方向
へ摺動させ、その際に加熱してトナー像を複写用紙Ｐに
定着させるようになっている。Then, the outer surface of the resistance heating element 3 is covered with a glassy overcoat layer 4 which is an electric insulating layer and a protective layer on the surface 2a of the substrate, so that a machine having abrasion resistance and impact resistance can be obtained. The mechanical strength is improved, corrosion resistance is protected from sulfidation and oxidation, and electrical insulation is provided between the top surface of the overcoat layer 4 and a rotatable pressure roller that is in contact with the overcoat layer 4 via a film or the like. On the top surface of the overcoat layer 4, for example, a copy sheet P on which a toner image is formed is slid in the width direction of the resistance heating element 3 from in to out as shown by an arrow in the figure, and heating is performed at that time. Then, the toner image is fixed on the copy paper P.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の定着ヒータ１ではオーバーコート層４の複写
用紙Ｐを摺動せしめる表面を所定の表面粗さに形成する
ために熱伝導率の低いガラスにより形成しているので、
抵抗発熱体３の発熱がオーバーコート層４の幅方向両端
まで伝導するのに時間がかかる。However, in such a conventional fixing heater 1, since the surface of the overcoat layer 4 on which the copy paper P is slid is formed to have a predetermined surface roughness, glass having a low thermal conductivity is used. Since it is formed by
It takes time for the heat generated by the resistance heating element 3 to reach both ends of the overcoat layer 4 in the width direction.
【０００６】このために、オーバーコート層４の幅方向
温度分布は図８に示すように山状に分布し、抵抗発熱体
３の発熱の立上がり時ｔ1 にはオーバーコート層４の頂
面上の温度が幅方向中心軸ないし周辺部でピークとなっ
て、その幅方向両端で低く分布する。そして、所定時間
経過後ｔ0 にはオーバーコート層４の幅方向両端まで熱
伝導されてほぼ平坦化する。For this reason, the temperature distribution in the width direction of the overcoat layer 4 is distributed in a mountain shape as shown in FIG. 8, and at the rising time t1 of the heat generation of the resistance heating element 3, the temperature is on the top surface of the overcoat layer 4. The temperature has a peak at the central axis in the width direction or the peripheral portion, and is distributed low at both ends in the width direction. Then, after a lapse of a predetermined time, at t0, heat is conducted to both ends in the width direction of the overcoat layer 4 to be substantially flat.
【０００７】したがって、抵抗発熱体３の発熱立上がり
時にはオーバーコート層４の頂面上の温度分布の平坦性
が低いので、温度むらを発生し、複写用紙Ｐの定着むら
を発生させるうえに、加熱領域が狭いので、複写用紙Ｐ
の紙送りの高速化を図り難いという課題がある。Therefore, since the flatness of the temperature distribution on the top surface of the overcoat layer 4 is low when the resistance heating element 3 starts to generate heat, temperature unevenness occurs, causing uneven fixing of the copy paper P and heating. Since the area is small, copy paper P
However, there is a problem that it is difficult to increase the paper feeding speed.
【０００８】そこで本発明の目的は、複写用紙等被定着
体が摺動する摺動面上の加熱の立上げと温度分布の平坦
化とを共に早めることにより、加熱立上げ時の温度むら
と温度むらによる定着むらとを共に低減することができ
る定着ヒータ，定着装置および画像形成装置を提供する
ことにある。Therefore, an object of the present invention is to speed up both heating and flattening of the temperature distribution on a sliding surface on which an object to be fixed, such as copy paper, slides, so that temperature unevenness at the time of heating and heating can be eliminated. An object of the present invention is to provide a fixing heater, a fixing device, and an image forming apparatus capable of reducing the fixing unevenness due to the temperature unevenness.
【０００９】[0009]
【課題を解決するための手段】本願の請求項１の定着ヒ
ータは、耐熱性電気絶縁材料よりなる細長い基板と；こ
の基板の一面上に形成される抵抗発熱体と；この抵抗発
熱体の外表面とその周囲の基板一面上の一部とを共に直
接または間接に被覆し、熱伝導率の高い材料よりなる高
熱伝導層と；高熱伝導層の少なくとも頂面を、その高熱
伝導材よりも熱伝導率の低い材料により被覆すると共
に、少なくとも頂面を平滑面に形成している平滑層と；
を具備していることを特徴とする。A fixing heater according to claim 1 of the present application comprises an elongated substrate made of a heat-resistant electrically insulating material; a resistance heating element formed on one surface of the substrate; and an outside of the resistance heating element. A high thermal conductivity layer made of a material having a high thermal conductivity, which directly or indirectly covers both the surface and a part of the surrounding surface of the substrate; and at least the top surface of the high thermal conductivity layer has a higher thermal conductivity than the high thermal conductivity material. A smooth layer which is covered with a material having a low conductivity and has at least a top surface formed into a smooth surface;
It is characterized by having.
【００１０】本請求項と以下の請求項において耐熱性電
気絶縁材料よりなる基板とはアルミナやムライト等のセ
ラミックス製の細長板状体、または湾曲板、あるいは円
筒状や円柱状を含む。高熱伝導材とは平滑層の構成材料
よりも熱伝導率が高いものであればよい。In the present claims and the following claims, the substrate made of a heat-resistant electrically insulating material includes an elongated plate-like body made of ceramics such as alumina or mullite, a curved plate, or a cylindrical shape or a cylindrical shape. The high thermal conductive material may be one having a higher thermal conductivity than the constituent material of the smooth layer.
【００１１】本請求項によれば、抵抗発熱体の発熱を高
熱伝導層により平滑層に逸早く熱伝導させることができ
るので、抵抗発熱体の発熱立上がり時の平滑層の頂面の
ほぼ全面上の温度分布を逸早く平坦化することができ
る。According to the present invention, since the heat generated by the resistance heating element can be quickly conducted to the smooth layer by the high heat conduction layer, almost all of the top surface of the smooth layer when the resistance heating element rises up is formed. The temperature distribution can be flattened quickly.
【００１２】このために、加熱立上がり時の抵抗発熱体
の発熱立上がり時の温度むらを低減することができるの
で、被定着体の定着むらを低減することができる。しか
も、高熱伝導層により抵抗発熱体の発熱を平滑層のほぼ
全面に逸早く熱伝導させることができるので、その分加
熱領域を逸早く拡大させることができると共に、被定着
体が摺動する平滑層の頂面を平滑面に形成しているの
で、その被定着体の摺動抵抗を低減することができる。
このために、複写用紙等の被定着体の送り速度の高速化
に対応することができる。For this reason, since the temperature unevenness of the resistance heating element at the time of heating rising can be reduced, the fixing unevenness of the object to be fixed can be reduced. Moreover, since the heat generation of the resistance heating element can be rapidly conducted to almost the entire surface of the smoothing layer by the high heat conduction layer, the heating region can be expanded rapidly correspondingly, and at the same time, the smoothing layer on which the fixing object slides can be formed. Since the top surface is formed as a smooth surface, the sliding resistance of the fixing target can be reduced.
Therefore, it is possible to cope with an increase in the feeding speed of the fixing target such as copy paper.
【００１３】請求項２の定着ヒータは、高熱伝導層と平
滑層の少なくとも一方は、電気絶縁性を有することを特
徴とする。According to a second aspect of the fixing heater, at least one of the high thermal conductive layer and the smooth layer has an electric insulation property.
【００１４】本請求項によれば、高熱伝導層と平滑層の
少なくとも一方は電気絶縁性を有するので、抵抗発熱体
に対する耐圧性を得ることができる。According to the present invention, at least one of the high thermal conductive layer and the smoothing layer has an electrical insulating property, so that the pressure resistance against the resistance heating element can be obtained.
【００１５】請求項３の定着ヒータは、高熱伝導層と平
滑層の少なくとも一方は、複数層で形成されていること
を特徴とする。According to a third aspect of the fixing heater, at least one of the high thermal conductive layer and the smooth layer is formed of a plurality of layers.
【００１６】本請求項によれば、高熱伝導層と平滑層の
少なくとも一方を、複数層により形成することにより、
これらの各層の厚さを増大させて抵抗発熱体に対する耐
圧性を高めることができる。According to the present invention, by forming at least one of the high thermal conductive layer and the smooth layer by a plurality of layers,
By increasing the thickness of each of these layers, the pressure resistance against the resistance heating element can be improved.
【００１７】請求項４の定着ヒータは、高熱伝導層は、
主成分であるほう珪酸ガラスにフィラーを混合してなる
ことを特徴とする。In the fixing heater according to the fourth aspect, the high thermal conductive layer is
It is characterized by mixing a borosilicate glass as a main component with a filler.
【００１８】本請求項によれば、ほう珪酸ガラスに混合
するフィラーの混合量を適宜調節することにより、高熱
伝導層の高熱伝導率を複写機等の機種に応じて適宜制御
することができる。According to the present invention, the high thermal conductivity of the high thermal conductive layer can be appropriately controlled according to the model such as a copying machine by appropriately adjusting the mixing amount of the filler mixed with the borosilicate glass.
【００１９】また、高熱伝導層を、電気絶縁性を有する
ほう珪酸ガラスを主成分とする高熱伝導材により形成す
るので、抵抗発熱体に対する耐圧性を向上させることが
できる。Further, since the high heat conductive layer is formed of the high heat conductive material containing electrically insulating borosilicate glass as a main component, the pressure resistance against the resistance heating element can be improved.
【００２０】請求項５の定着ヒータは、高熱伝導層は、
基板一面の幅方向両端近傍まで延在するように形成され
ていることを特徴する。In the fixing heater according to the fifth aspect, the high thermal conductive layer is
It is characterized in that it is formed so as to extend to the vicinity of both ends in the width direction of the entire surface of the substrate.
【００２１】本請求項によれば、高熱伝導層を基板の幅
方向両端の近傍まで幅広く形成しているので、加熱領域
に拡大することができる。このために、複写用紙等被定
着体の送り速度の高速化に対応することができる。According to the present invention, since the high thermal conductive layer is formed widely up to the vicinity of both ends in the width direction of the substrate, it can be expanded to the heating region. For this reason, it is possible to cope with an increase in the feeding speed of the fixing target such as copy paper.
【００２２】請求項６の定着装置は、請求項１ないし５
のいずれか一に記載の定着ヒータと；この定着ヒータに
圧接するように対向配置されて、この定着ヒータからの
熱を被定着体の画像を形成しているトナーに作用させる
とともに、この被定着体を搬送する加圧ローラと；を具
備していることを特徴とする。A fixing device according to a sixth aspect of the present invention is the fixing device according to the first aspect.
The fixing heater according to any one of the above; and the heat from the fixing heater, which is disposed so as to be in pressure contact with the fixing heater, acts on the toner forming the image on the fixing target and the fixing target. And a pressure roller for conveying the body.
【００２３】請求項７の画像形成装置は、請求項６記載
の定着装置と；媒体に形成された静電潜像にトナーを付
着させて反転画像を形成し、この反転画像を被定着体に
転写して所定の画像を形成する手段と；を具備している
ことを特徴とする。An image forming apparatus according to a seventh aspect of the present invention is the fixing apparatus according to the sixth aspect, wherein toner is attached to the electrostatic latent image formed on the medium to form a reverse image, and the reverse image is applied to the fixing target. And means for forming a predetermined image by transferring.
【００２４】したがって、請求項６記載の定着装置と請
求項７の画像形成装置は共に、請求項１ないし５のいず
れか一記載の定着ヒータを有するので、これらとほぼ同
一の作用効果を奏することができる。Therefore, since both the fixing device according to the sixth aspect and the image forming apparatus according to the seventh aspect have the fixing heater according to any one of the first aspect to the fifth aspect, they have substantially the same function and effect. You can
【００２５】[0025]
【発明の実施の形態】以下、図１〜図７に基づいて本発
明の実施の形態を説明する。なお、図１〜図７中、同一
または相当部分には同一符号を付している。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 7, the same or corresponding parts are denoted by the same reference numerals.
【００２６】図２は本発明の第１の実施形態に係る定着
ヒータ１０の平面図、図１は図２のＩ−Ｉ線切断部の端
面図であり、これらの図において、定着ヒータ１０は耐
熱性・電気絶縁性材料の例えばアルミナ（Ａｌ2 Ｏ3 ）
セラミックスやムライト（３Ａｌ2 ・２ＳｉＯ2 ）セラ
ミックス等からなる細長い基板１１の表面１１ａ上に、
その長手方向に沿って細長い膜状の抵抗発熱体１２を形
成している。FIG. 2 is a plan view of the fixing heater 10 according to the first embodiment of the present invention, and FIG. 1 is an end view of the section taken along the line I--I in FIG. Heat resistant / electrically insulating material such as alumina (Al 2 O 3 )
The ceramics and mullite (3Al 2 · 2SiO 2) on the surface 11a of the elongated substrate 11 made of ceramics or the like,
An elongated film-shaped resistance heating element 12 is formed along the longitudinal direction.
【００２７】基板１１は例えば長さ約２５０〜４００m
m，幅約６〜１３mm，厚さ約０．６〜約１mmの大きさの
長方形に形成されている。抵抗発熱体１２は例えば長さ
約２３０mm，厚さ約１０μｍの銀・パラジウム（Ａｇ・
Ｐｄ）合金やニッケル・錫（Ｎｉ・Ｓｎ）合金等を主体
とする厚膜により形成されている。The substrate 11 has a length of about 250 to 400 m, for example.
It is formed in a rectangle with a size of m, a width of about 6 to 13 mm, and a thickness of about 0.6 to about 1 mm. The resistance heating element 12 is, for example, about 230 mm long and about 10 μm thick silver-palladium (Ag.
It is formed of a thick film mainly composed of Pd) alloy, nickel-tin (Ni-Sn) alloy, or the like.
【００２８】抵抗発熱体１２は例えばその両端部に、そ
の一部を上下方向で重ねて、銀あるいは銀・白金（Ａｇ
・Ｐｔ）合金，銀・パラジウム合金（Ａｇ・Ｐｄ）等の
良導電体からなる膜を形成して一対の電極１３ａ，１３
ｂを形成して、抵抗発熱体１２に電気的に接続してい
る。一対の電極１３ａ，１３ｂには図示しないコネクタ
を介して抵抗発熱体１２に通電するようになっている。The resistance heating element 12 is, for example, partly overlapped on both ends thereof in the vertical direction to form silver or silver / platinum (Ag).
.Pt) alloy, silver-palladium alloy (Ag.Pd), etc. to form a film made of a good electric conductor to form a pair of electrodes 13a, 13
b is formed and electrically connected to the resistance heating element 12. The pair of electrodes 13a and 13b are configured to supply current to the resistance heating element 12 via a connector (not shown).
【００２９】そして、抵抗発熱体１２の長手方向両端部
を除くほぼ全外表面を被覆する高熱伝導層１４を基板表
面１１ａ上に厚膜により形成している。高熱伝導層１４
は軸横断面形状がほぼコの字状をなし、その頂面（図１
では上面）を平坦面に形成している。Then, a high thermal conductive layer 14 covering substantially the entire outer surface of the resistance heating element 12 except both ends in the longitudinal direction is formed as a thick film on the substrate surface 11a. High thermal conductive layer 14
Has a substantially U-shaped cross section, and its top surface (Fig. 1
The upper surface) is formed into a flat surface.
【００３０】高熱伝導層１４は、主成分のほう珪酸ガラ
スに、アルミナ等のフィラーを混合することにより熱伝
導率を高めている高熱伝導材のペーストを基板表面１１
ａ上に印刷塗布して焼成することにより形成され、ある
いは、これら印刷塗布と焼成工程を複数回繰り返すこと
により複数層に形成されて、所定の厚さに形成されてい
る。フィラーはその混合量を増量させることにより熱伝
導率を高めることができる反面、表面粗さを荒くする作
用を有する。For the high thermal conductive layer 14, a paste of a high thermal conductive material whose thermal conductivity is increased by mixing a filler such as alumina with borosilicate glass as a main component is used as the substrate surface 11.
It is formed by printing and coating on a and baking, or by forming these into a plurality of layers by repeating the printing and baking steps a plurality of times to form a predetermined thickness. The filler can increase the thermal conductivity by increasing the mixing amount, but has the effect of roughening the surface roughness.
【００３１】そして、高熱伝導層１４は基板表面１１ａ
の幅方向両端の近傍まで幅広く形成されている。この高
熱伝導層１３の頂面（図１では上面）上には平滑層１５
を形成している。The high thermal conductive layer 14 is formed on the substrate surface 11a.
Is formed wide to the vicinity of both ends in the width direction. A smoothing layer 15 is formed on the top surface (upper surface in FIG. 1) of the high thermal conductive layer 13.
Is formed.
【００３２】平滑層１５は高熱伝導層１４の高熱伝導材
よりも熱伝導率は低いが表面粗さを平滑に形成すること
ができる。ほう珪酸ガラスのペーストの印刷塗布と焼成
により形成され、あるいは、これら印刷塗布と焼成の工
程を複数回繰り返すことにより複数層に形成されて所定
厚に形成されており、その層厚は高熱伝導層１４の厚さ
よりも薄いが、その図中上面の頂面を平滑面に厚膜形成
している。この平滑層１５の頂面上に、トナー像を形成
している複写用紙Ｐを摺動させ、その際にトナー像を加
熱して定着させるようになっている。The smooth layer 15 has a lower thermal conductivity than that of the high thermal conductive material of the high thermal conductive layer 14, but can be formed to have a smooth surface roughness. The borosilicate glass paste is formed by printing and baking, or by repeating these printing and baking processes a plurality of times to form a plurality of layers with a predetermined thickness. Although it is thinner than the thickness of 14, a thick film is formed on the top surface of the upper surface in the figure as a smooth surface. The copy sheet P on which the toner image is formed is slid on the top surface of the smooth layer 15, and at that time, the toner image is heated and fixed.
【００３３】したがって、図示しないコネクタを介して
一対の電極１３ａ，１３ｂに通電すると、抵抗発熱体１
２が通電されて発熱するが、その発熱の立上がり時ｔ1
には、その発熱が高熱伝導層１４により、その幅方向両
端も含む平滑層１５のほぼ全面に逸早く伝導される。Therefore, when electricity is applied to the pair of electrodes 13a, 13b through a connector (not shown), the resistance heating element 1
2 is energized and generates heat, but at the rise of heat generation t1
The heat generated by the high thermal conductive layer 14 is quickly conducted to almost the entire surface of the smoothing layer 15 including both ends in the width direction.
【００３４】このために、図１に示すように平滑層１５
の頂面上の幅方向温度分布を逸早くほぼ平坦化し、所定
時間ｔ0 後にはその温度分布の平坦化を保った状態で所
定温度まで逸早く昇温させることができる。For this purpose, as shown in FIG.
The temperature distribution in the width direction on the top surface of the can be rapidly flattened, and after a predetermined time t0, the temperature can be rapidly raised to a predetermined temperature while the flatness of the temperature distribution is maintained.
【００３５】その結果、抵抗発熱体１２の発熱立上がり
時ｔ1 においても温度むらを低減することができるの
で、トナー像を形成している複写用紙Ｐの定着むらを低
減することができるうえに、所定温度への立上がりも早
めることができる。さらに平滑層１５の頂面上に複写用
紙Ｐまたはフィルムを摺動させるので、その摺動抵抗を
低減することができる。このために、複写用紙Ｐの紙送
りの高速化に対応することができる。As a result, it is possible to reduce the temperature unevenness even at the time t1 of the heat generation of the resistance heating element 12, so that it is possible to reduce the fixing unevenness of the copy sheet P on which the toner image is formed, and at the same time, to obtain a predetermined value. The rise to temperature can be accelerated. Furthermore, since the copy paper P or the film is slid on the top surface of the smooth layer 15, the sliding resistance can be reduced. Therefore, it is possible to cope with the speeding up of the feeding of the copy sheet P.
【００３６】そして、高熱伝導層１４と平滑層１５の両
者が電気絶縁性を有するほう珪酸ガラスを主成分とする
ので、抵抗発熱体１２に対する耐圧性を得ることができ
る。Since both the high thermal conductive layer 14 and the smooth layer 15 are mainly composed of electrically insulating borosilicate glass, pressure resistance against the resistance heating element 12 can be obtained.
【００３７】また、高熱伝導層１４と平滑層１５の少な
くとも一方を、複数層により形成することにより、これ
らの各層の厚さを適宜増大させて抵抗発熱体１２に対す
る耐圧性を適宜高めることができる。Further, by forming at least one of the high thermal conductive layer 14 and the smoothing layer 15 by a plurality of layers, it is possible to appropriately increase the thickness of each of these layers and appropriately increase the pressure resistance against the resistance heating element 12. .
【００３８】さらに、ほう珪酸ガラスに混合するフィラ
ーの混合量を適宜調節することにより、高熱伝導層１４
の高熱伝導率を複写機等の機種に応じて適宜制御するこ
とができる。Further, the high thermal conductive layer 14 can be prepared by appropriately adjusting the amount of the filler mixed with the borosilicate glass.
The high thermal conductivity of can be appropriately controlled according to the model such as a copying machine.
【００３９】そして、高熱伝導層１４を基板表面１１ａ
の幅方向両端の近傍まで幅広く形成しているので、加熱
領域を拡大することができる。このために、複写用紙Ｐ
の送り速度の高速化に対応することができる。Then, the high thermal conductive layer 14 is formed on the substrate surface 11a.
Since it is formed so as to be wide in the vicinity of both ends in the width direction, the heating region can be expanded. For this purpose, copy paper P
It is possible to cope with the increase in the feeding speed of.
【００４０】図４は本発明の第２実施形態に係る定着ヒ
ータ１０Ａの平面図、図３は図４のIII−III 線切断部
の端面図であり、この定着ヒータ１０Ａは高熱伝導層１
４Ａと平滑層１５Ａとを共に断面コ字状に形成してコ字
状の高熱伝導層１４Ａの頂面と共に両側面とを平滑層１
５Ａにより一体に被覆すると共に、平滑層１５Ａの厚膜
層数を増加させることにより、その厚さを高熱伝導層１
４Ａの厚さよりも厚くした点に特徴がある。FIG. 4 is a plan view of a fixing heater 10A according to a second embodiment of the present invention, and FIG. 3 is an end view of a section taken along the line III-III of FIG.
4A and the smoothing layer 15A are both formed in a U-shaped cross section so that the top surface and the both side surfaces of the U-shaped high thermal conductive layer 14A are smoothed.
The thickness of the high thermal conductive layer 1 is increased by increasing the number of thick film layers of the smoothing layer 15A while being integrally coated with 5A.
It is characterized in that it is thicker than 4A.
【００４１】この定着ヒータ１０Ａによっても、抵抗発
熱体１２と平滑層１５Ａとの間に高熱伝導層１４Ａを密
に介在させているので、上記実施形態と同様に抵抗発熱
体１２の発熱の立上がり時における平滑層１５Ａの頂面
上の幅方向温度分布を逸早く平坦化することができる。
このために、定着ヒータ１０Ａの立上がり時においても
定着むらを低減することができる等上記実施形態とほぼ
同様の作用効果を奏することができる。また、図５で示
す定着ヒータ１０Ｂのように高熱伝導層１４Ｂ1 ，１４
Ｂ2 を複数層形成してもよく、平滑層１５の頂面上に何
らかの層をさらに設けてもよい。さらに、上記各実施形
態では抵抗発熱体１２を各高熱伝導層１４，１４Ａ，１
４Ｂによりそれぞれ直接被覆しているが、何らかの部材
を介して間接的に被覆してもよい。さらにまた、上記実
施形態では基盤１１が平板状の場合について説明した
が、本発明は基板１１を湾曲させ、あるいは円筒または
円柱状のローラ型に構成してもよい。Also with this fixing heater 10A, since the high thermal conductive layer 14A is closely interposed between the resistance heating element 12 and the smoothing layer 15A, when the resistance heating element 12 generates heat as in the above embodiment. The temperature distribution in the width direction on the top surface of the smoothing layer 15A can be flattened quickly.
Therefore, even when the fixing heater 10A rises, it is possible to achieve the same effects as those of the above-described embodiment, such as fixing unevenness can be reduced. Further, as in the fixing heater 10B shown in FIG. 5, the high thermal conductive layers 14B1 and 14B1
A plurality of layers of B2 may be formed, and some layer may be further provided on the top surface of the smoothing layer 15. Further, in each of the above-described embodiments, the resistance heating element 12 is connected to each of the high thermal conductive layers 14, 14A, 1
Although each of them is directly coated with 4B, it may be coated indirectly through some member. Furthermore, in the above-described embodiment, the case where the base 11 has a flat plate shape has been described, but the present invention may also be configured so that the substrate 11 is curved or has a cylindrical or cylindrical roller type.
【００４２】図６は本発明を画像形成装置の一種である
電子式複写機２１に適用した場合の第２の実施形態の構
成を示しており、この複写機２１は筐体２２内に、カセ
ット２３内の複写用紙Ｐを引き込み、これに図示しない
原稿の画像に対応したトナー画像を形成する画像形成部
２４と、このトナー画像を複写用紙Ｐに定着させる定着
装置２５とを内蔵している。FIG. 6 shows the configuration of a second embodiment in which the present invention is applied to an electronic copying machine 21 which is a kind of image forming apparatus. The copying machine 21 has a housing 22 and a cassette. An image forming unit 24 that draws in the copy sheet P in the sheet 23 and forms a toner image corresponding to an image of an original document (not shown), and a fixing device 25 that fixes the toner image on the copy sheet P are incorporated.
【００４３】定着装置２５は例えば図７に示すように構
成され、加圧ローラ２６に対向させて上記定着ヒータ１
０，１０Ａ，１０Ｂのいずれか、例えば１０を並設して
おり、定着ヒータ１０はほぼ円筒状のホルダー２７に取
り付けられている。The fixing device 25 is constructed, for example, as shown in FIG. 7, and faces the pressure roller 26 so as to face the fixing heater 1.
Any one of 0, 10A, and 10B, for example, 10 is arranged in parallel, and the fixing heater 10 is attached to a substantially cylindrical holder 27.
【００４４】そして、定着ヒータ１０を含むホルダー２
７の外周囲にはポリイミド樹脂にフッ素樹脂がコーティ
ングされたような環状無端耐熱シート２８が巻装されて
いて、定着ヒータ１０の真上の平滑層１５の図中上面は
この耐熱シート２８を介して加圧ローラ２６のシリコン
ゴム層と弾性的に接している。The holder 2 including the fixing heater 10
A ring-shaped endless heat resistant sheet 28 such as polyimide resin coated with fluororesin is wound around the outer periphery of 7, and the upper surface of the smoothing layer 15 right above the fixing heater 10 in the figure is interposed by this heat resistant sheet 28. And is in elastic contact with the silicone rubber layer of the pressure roller 26.
【００４５】そして、定着ヒータ１０は一対の電極１３
ａ，１３ｂに接触した燐青銅板等からなる弾性が付与さ
れたコネクタ（図示せず）を通じて通電されて抵抗発熱
体１２が発熱し、この発熱は熱伝導層１４により逸早く
平滑層１５のほぼ全面に伝熱される。したがって、この
平滑層１５の頂面上の幅方向の温度分布かが逸早く平坦
化して、平滑層１５の頂面上の熱により、耐熱シート２
８の外面と加圧ローラ２６のシリコーンゴム層との間で
挟圧された、トナー像Ｔを形成した複写用紙Ｐを均等に
加熱することにより、未定着トナー像Ｔを溶融し、複写
用紙Ｐに定着させることができる。The fixing heater 10 has a pair of electrodes 13
The resistance heating element 12 generates heat by being energized through an elastic connector (not shown) made of a phosphor bronze plate or the like in contact with a and 13b. Be transferred to. Therefore, the temperature distribution in the width direction on the top surface of the smooth layer 15 is rapidly flattened, and the heat-resistant sheet 2 is heated by the heat on the top surface of the smooth layer 15.
The copy paper P on which the toner image T is formed, which is sandwiched between the outer surface of the pressure roller 26 and the silicone rubber layer of the pressure roller 26, is evenly heated to melt the unfixed toner image T and to copy the copy paper P. Can be fixed on.
【００４６】そして、この定着ヒータ１０は上記したよ
うに加熱の立上げとその温度分布の平坦化とを共に早め
ることができるうえに、抵抗発熱体１２による加熱領域
の拡大および耐圧性向上と、複写用紙Ｐの摺動抵抗の低
減とを共に図ることができるので、電子式複写機２１と
しても同様の効果を有し、紙送りの高速化にも対応する
ことができる。As described above, the fixing heater 10 can accelerate both the start-up of heating and the flattening of its temperature distribution, and at the same time, the resistance heating element 12 enlarges the heating region and improves the pressure resistance. Since it is possible to reduce the sliding resistance of the copy paper P together, the electronic copy machine 21 has the same effect and can cope with high speed paper feed.
【００４７】[0047]
【発明の効果】以上説明したように本願の請求項１記載
の発明は、抵抗発熱体の発熱を高熱伝導層により平滑層
に逸早く熱伝導させることができるので、抵抗発熱体の
発熱立上がり時の平滑層の頂面のほぼ全面上の温度分布
を逸早く平坦化することができる。As described above, according to the invention of claim 1 of the present application, the heat generated by the resistance heating element can be rapidly conducted to the smooth layer by the high heat conduction layer, so that the heat generation of the resistance heating element rises. The temperature distribution on almost the entire top surface of the smooth layer can be flattened quickly.
【００４８】このために、加熱立上がり時の抵抗発熱体
の発熱立上がり時の温度むらを低減することができるの
で、被定着体の定着むらを低減することができる。しか
も、高熱伝導層により抵抗発熱体の発熱を平滑層のほぼ
全面に逸早く熱伝導させることができるので、その分加
熱領域を逸早く拡大させることができると共に、被定着
体が摺動する平滑層の頂面を平滑面に形成しているの
で、その被定着体の摺動抵抗を低減することができる。
このために、複写用紙等の被定着体の送り速度の高速化
に対応することができる。For this reason, it is possible to reduce the unevenness in temperature of the resistance heating element at the time of rising of the heating, so that the unevenness of fixing of the object to be fixed can be reduced. Moreover, since the heat generation of the resistance heating element can be rapidly conducted to almost the entire surface of the smoothing layer by the high heat conduction layer, the heating region can be expanded rapidly correspondingly, and at the same time, the smoothing layer on which the fixing object slides can be formed. Since the top surface is formed as a smooth surface, the sliding resistance of the fixing target can be reduced.
Therefore, it is possible to cope with an increase in the feeding speed of the fixing target such as copy paper.
【００４９】請求項２の定着ヒータは、高熱伝導層と平
滑層の少なくとも一方は電気絶縁性を有するので、抵抗
発熱体に対する耐圧性を得ることができる。In the fixing heater according to the second aspect, at least one of the high heat conduction layer and the smooth layer has an electric insulation property, and therefore, the pressure resistance against the resistance heating element can be obtained.
【００５０】請求項３の定着ヒータは、高熱伝導層と平
滑層の少なくとも一方を、複数層により形成することに
より、これらの各層の厚さを増大させて抵抗発熱体に対
する耐圧性を高めることができる。In the fixing heater according to the third aspect, at least one of the high thermal conductive layer and the smooth layer is formed of a plurality of layers, whereby the thickness of each of these layers can be increased and the pressure resistance against the resistance heating element can be increased. it can.
【００５１】請求項４の定着ヒータは、ほう珪酸ガラス
に混合するフィラーの混合量を適宜調節することによ
り、高熱伝導層の高熱伝導率を複写機等の機種に応じて
適宜制御することができる。In the fixing heater according to the fourth aspect, the high thermal conductivity of the high thermal conductive layer can be appropriately controlled according to the model such as a copying machine by appropriately adjusting the mixing amount of the filler mixed with the borosilicate glass. .
【００５２】また、高熱伝導層を、電気絶縁性を有する
ほう珪酸ガラスを主成分とする高熱伝導材により形成す
るので、抵抗発熱体に対する耐圧性を向上させることが
できる。Further, since the high heat conductive layer is formed of the high heat conductive material containing electrically insulating borosilicate glass as a main component, the pressure resistance against the resistance heating element can be improved.
【００５３】請求項５の定着ヒータは、高熱伝導層を基
板の幅方向両端の近傍まで幅広く形成しているので、加
熱領域に拡大することができる。このために、複写用紙
等被定着体の送り速度の高速化に対応することができ
る。In the fixing heater according to the fifth aspect, the high thermal conductive layer is formed wide up to the vicinity of both ends in the width direction of the substrate, so that it can be expanded to the heating region. For this reason, it is possible to cope with an increase in the feeding speed of the fixing target such as copy paper.
【００５４】請求項６記載の定着装置と請求項７の画像
形成装置は共に、請求項１ないし５のいずれか一記載の
定着ヒータを有するので、これらとほぼ同一の作用効果
を奏することができる。Since both the fixing device according to the sixth aspect and the image forming apparatus according to the seventh aspect have the fixing heater according to any one of the first to fifth aspects, it is possible to obtain substantially the same operational effect. .
【図１】図２のＩ−Ｉ線切断部の端面とその温度分布と
を共に示す図。FIG. 1 is a view showing both an end face of a section taken along the line II of FIG. 2 and its temperature distribution.
【図２】本発明の第１の実施形態に係る定着ヒータの一
部切欠平面図。FIG. 2 is a partially cutaway plan view of the fixing heater according to the first embodiment of the present invention.
【図３】図４の III−III 線切断部の端面図。FIG. 3 is an end view of a section taken along line III-III in FIG.
【図４】本発明の第２の実施形態に係る定着ヒータの一
部切欠平面図。FIG. 4 is a partially cutaway plan view of a fixing heater according to a second embodiment of the present invention.
【図５】本発明の第３の実施形態に係る定着ヒータの縦
断面図。FIG. 5 is a vertical sectional view of a fixing heater according to a third embodiment of the present invention.
【図６】本発明の第４の実施形態に係る画像形成装置の
全体構成図。FIG. 6 is an overall configuration diagram of an image forming apparatus according to a fourth embodiment of the present invention.
【図７】図６で示す定着装置の拡大縦断面図。FIG. 7 is an enlarged vertical sectional view of the fixing device shown in FIG.
【図８】従来の定着ヒータの縦断面とその温度分布を共
に示す図。FIG. 8 is a diagram showing both a vertical cross section of a conventional fixing heater and its temperature distribution.
１０，１０Ａ，１０Ｂ 定着ヒータ １１ 基板 １１ａ 基板表面 １２ 抵抗発熱体 １３ａ，１３ｂ 一対の電極 １４，１４Ａ，１４Ｂ1 ，１４Ｂ2 高熱伝導層 １５，１５Ａ，１５Ｂ 平滑層 ２１ 電子式複写機 ２２ 筐体 ２３ カセット ２４ 画像形成部 ２５ 定着装置 ２６ 加圧ローラ ２７ ホルダー ２８ 耐熱シート 10, 10A, 10B Fixing heater 11 Substrate 11a Substrate surface 12 Resistance heating element 13a, 13b A pair of electrodes 14, 14A, 14B1, 14B2 High thermal conductive layer 15, 15A, 15B Smooth layer 21 Electronic copying machine 22 Housing 23 Cassette 24 Image forming unit 25 Fixing device 26 Pressure roller 27 Holder 28 Heat resistant sheet
Claims (7)
と；この基板の一面上に形成される抵抗発熱体と；この
抵抗発熱体の外表面とその周囲の基板一面上の一部とを
共に直接または間接に被覆し、熱伝導率の高い材料より
なる高熱伝導層と；高熱伝導層の少なくとも頂面を、そ
の高熱伝導材よりも熱伝導率の低い材料により被覆する
と共に、少なくとも頂面を平滑面に形成している平滑層
と；を具備していることを特徴とする定着ヒータ。1. An elongated substrate made of a heat-resistant electrically insulating material; a resistance heating element formed on one surface of the substrate; and an outer surface of the resistance heating element and a part of the periphery of the resistance heating element on the one surface of the substrate. A high thermal conductivity layer that is directly or indirectly coated with a material having a high thermal conductivity; at least the top surface of the high thermal conductivity layer is coated with a material having a thermal conductivity lower than that of the high thermal conductivity material, and at least the top surface A fixing heater comprising: a smooth layer formed on a smooth surface;
は、電気絶縁性を有することを特徴とする請求項１記載
の定着ヒータ。2. The fixing heater according to claim 1, wherein at least one of the high thermal conductive layer and the smooth layer has electrical insulation.
は、複数層で形成されてい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。3. At least one of the high thermal conductive layer and the smooth layer is formed of a plurality of layers.
Alternatively, the fixing heater described in 2.
ラスにフィラーを混合してなることを特徴とする請求項
１ないし３のいずれか一記載の定着ヒータ。4. The fixing heater according to claim 1, wherein the high thermal conductive layer is formed by mixing a borosilicate glass as a main component with a filler.
傍まで延在するように形成されていることを特徴する請
求項１ないし４のいずれか一記載の定着ヒータ。5. The fixing heater according to claim 1, wherein the high thermal conductive layer is formed so as to extend to the vicinity of both ends in the width direction of the one surface of the substrate.
定着ヒータと；この定着ヒータに圧接するように対向配
置されて、この定着ヒータからの熱を被定着体の画像を
形成しているトナーに作用させるとともに、この被定着
体を搬送する加圧ローラと；を具備していることを特徴
とする定着装置。6. The fixing heater according to claim 1, which is arranged so as to face the fixing heater so as to come into pressure contact with the fixing heater, and heat from the fixing heater forms an image on a fixing target. A fixing device comprising: a pressure roller that acts on the existing toner and that conveys the object to be fixed.
された静電潜像にトナーを付着させて反転画像を形成
し、この反転画像を被定着体に転写して所定の画像を形
成する手段と；を具備していることを特徴とする画像形
成装置。7. The fixing device according to claim 6, wherein toner is attached to the electrostatic latent image formed on the medium to form a reverse image, and the reverse image is transferred to a fixing target to form a predetermined image. An image forming apparatus comprising: a forming unit;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7769296A JPH09269688A (en) | 1996-03-29 | 1996-03-29 | Fixing heater, fixing device, and image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7769296A JPH09269688A (en) | 1996-03-29 | 1996-03-29 | Fixing heater, fixing device, and image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09269688A true JPH09269688A (en) | 1997-10-14 |
Family
ID=13640953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7769296A Abandoned JPH09269688A (en) | 1996-03-29 | 1996-03-29 | Fixing heater, fixing device, and image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09269688A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006091139A (en) * | 2004-09-21 | 2006-04-06 | Harison Toshiba Lighting Corp | Fixing heater, fixing device, and image forming apparatus |
-
1996
- 1996-03-29 JP JP7769296A patent/JPH09269688A/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006091139A (en) * | 2004-09-21 | 2006-04-06 | Harison Toshiba Lighting Corp | Fixing heater, fixing device, and image forming apparatus |
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