JPH07169560A - Heater and heating device using the same - Google Patents
Heater and heating device using the sameInfo
- Publication number
- JPH07169560A JPH07169560A JP5314957A JP31495793A JPH07169560A JP H07169560 A JPH07169560 A JP H07169560A JP 5314957 A JP5314957 A JP 5314957A JP 31495793 A JP31495793 A JP 31495793A JP H07169560 A JPH07169560 A JP H07169560A
- Authority
- JP
- Japan
- Prior art keywords
- heater
- substrate
- heating element
- longitudinal direction
- current
- 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.)
- Granted
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Surface Heating Bodies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本願発明は、電子写真プロセスに
おいて、感光ドラムから用紙上に転写されたトナーを熱
定着する場合等に用いると好適な加熱ヒータおよびこれ
を用いた加熱装置に関する。このような電子写真プロセ
スは、乾式複写機、レーザプリンタ、ＬＥＤプリンタ、
ファクシミリの印字部等に広く応用されているものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater suitable for use in heat-fixing toner transferred from a photosensitive drum onto a sheet in an electrophotographic process, and a heating device using the heater. Such electrophotographic processes include dry copiers, laser printers, LED printers,
It is widely applied to the printing section of facsimiles.
【０００２】[0002]
【従来の技術】上記電子写真プロセスにおけるトナー定
着部の小型化、軽量化を図るとともに、使用可能温度へ
の昇温時間を短縮するために、上記定着用加熱ヒータと
して、ハロゲンランプを内挿した筒型回転ローラ式のヒ
ータに代え、絶縁基板上に発熱体を帯状に配置してなる
加熱ヒータが用いられることがある。2. Description of the Related Art In order to reduce the size and weight of the toner fixing section in the electrophotographic process and to shorten the time required to raise the temperature to a usable temperature, a halogen lamp is inserted as the fixing heater. Instead of the cylindrical rotary roller type heater, a heating heater having a heating element arranged in a strip shape on an insulating substrate may be used.
【０００３】かかる加熱ヒータは、本願の図６に示すよ
うに、矩形短冊板状の絶縁基板ａの上面に、長手方向に
延びる所定長さの帯状発熱体ｂを銀・パラジウムペース
ト等の抵抗体ペーストを用いて印刷・焼成することによ
り形成する一方、かかる帯状発熱体ｂの両端部に一部重
なるようにして、電極ｃ，ｃを銀ペースト等の導体ペー
ストを用いて印刷・焼成することにより形成するという
簡単な製造工程によって得ることができるとともに、概
して薄状であり、しかも発熱体ｂの両端電極ｃ，ｃ間へ
の通電後瞬時にして所定の使用温度に昇温するため、上
記電子写真プロセスにおける定着部の構成を小型化、軽
量化、低コスト化できるのみならず、通電後の待ち時間
をほとんどなくすことができるという利点をもってい
る。As shown in FIG. 6 of the present application, such a heater includes a strip-shaped heating element b of a predetermined length extending in the longitudinal direction on a top surface of a rectangular strip-shaped insulating substrate a resistor made of silver or palladium paste or the like. By forming and printing by using a paste, the electrodes c and c are printed and baked by using a conductive paste such as silver paste so as to partially overlap both ends of the band-shaped heating element b. It can be obtained by a simple manufacturing process of forming, and is generally thin, and since the temperature is raised to a predetermined operating temperature instantly after energization between the electrodes c, c of the heating element b, Not only can the size of the fixing unit in the photographic process be reduced, the weight can be reduced, and the cost can be reduced, but the waiting time after energization can be almost eliminated.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上記のよう
な加熱ヒータにおける問題は、比較的長い発熱体ｂの両
端部に電極ｃ，ｃが形成されているため、発熱体ｂが加
熱駆動を繰り返し受けるうちに、発熱体ｂと電極ｃ，ｃ
との境界部が熱ストレスによって破損する恐れがあると
いうことである。とりわけ、発熱体ｂ両端部の電極ｃ，
ｃからの熱放散に起因する発熱体両端部の温度低下を補
償するために、図７に示すように発熱体ｂ両端部を細幅
化する場合があるが、この場合においては、なおさら上
記の問題が増長される傾向となる。The problem with the heater as described above is that the heating element b is repeatedly heated and driven because the electrodes c are formed at both ends of the heating element b which is relatively long. While receiving the heating element b and the electrodes c, c
This means that the boundary between and may be damaged by heat stress. In particular, electrodes c on both ends of the heating element b,
In order to compensate for the temperature drop at both ends of the heating element due to heat dissipation from c, the both ends of the heating element b may be narrowed as shown in FIG. 7, but in this case, the above-mentioned Problems tend to be exacerbated.
【０００５】本願発明は、上記した事情のもとで考え出
されたものであって、図６または図７に示す構成をもつ
従来の加熱ヒータにおける上記問題を一挙に解消し、発
熱体と電極部への熱ストレスに起因する断線といった可
能性を著しく減じることができるのみならず、温度分布
の調整をより簡便に行うことができる加熱ヒータを提供
することをその基本的課題としている。The present invention has been devised under the above circumstances, and solves the above problems in the conventional heater having the configuration shown in FIG. The basic problem is to provide a heating heater that can not only significantly reduce the possibility of disconnection due to thermal stress on the parts but also can more easily adjust the temperature distribution.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
め、本願発明では、次の各技術的手段を講じている。In order to solve the above problems, the present invention takes the following technical means.
【０００７】本願の請求項１の加熱ヒータは、絶縁基板
上に、長手方向に延びる２本の通電用電極を形成する一
方、上記絶縁基板上における上記２本の通電用電極で挟
まれる帯状領域に、発熱体層を途切れなく形成したこと
に特徴づけられている。In the heater according to claim 1 of the present application, two energizing electrodes extending in the longitudinal direction are formed on an insulating substrate, and a strip-shaped region sandwiched by the two energizing electrodes on the insulating substrate. In addition, the heating element layer is characterized by being seamlessly formed.
【０００８】本願の請求項２の加熱ヒータは、請求項１
の加熱ヒータにおいて、上記２本の通電用電極を、その
長手方向両端部における間隔が長手方向中間部における
間隔よりも短くなるように形成したことに特徴づけられ
ている。The heater according to claim 2 of the present application is the heater according to claim 1.
In the above heater, the two energizing electrodes are characterized in that the gaps at both longitudinal end portions thereof are shorter than the gaps at the longitudinal intermediate portion.
【０００９】本願の請求項３の加熱ヒータは、絶縁基板
上に、長手方向に延びる２本の通電用電極と、この２本
の通電用電極の間を延びる短絡用電極パターンとを形成
する一方、上記絶縁基板上における上記通電用電極およ
び短絡用電極パターンで挟まれる各帯状領域に、発熱体
層を途切れなく形成したことに特徴づけられている。According to a third aspect of the heater of the present application, two current-carrying electrodes extending in the longitudinal direction and a short-circuiting electrode pattern extending between the two current-carrying electrodes are formed on an insulating substrate. The heating element layer is characterized in that it is continuously formed in each strip-shaped region sandwiched by the energizing electrode and the short-circuiting electrode pattern on the insulating substrate.
【００１０】本願の請求項４の加熱ヒータは、請求項３
の加熱ヒータにおいて、上記短絡用電極パターンを、上
記２本の通電用電極の両方または一方との間隔が、長手
方向両端部が長手方向中間部よりも短くなるように形成
したことに特徴づけられている。The heater according to claim 4 of the present application is the heater according to claim 3.
In the above heater, the short-circuit electrode pattern is formed such that the distance between the short-circuit electrode pattern and both or one of the two current-carrying electrodes is shorter at both longitudinal end portions than at the longitudinal intermediate portion. ing.
【００１１】本願の請求項５の加熱ヒータは、絶縁基板
上に、長手方向に延びる２本の通電用電極を形成する一
方、上記絶縁基板上における上記２本の通電用電極で挟
まれる帯状領域に発熱体層を形成するものにおいて、上
記発熱体層には、絶縁基板幅方向に対して傾斜する細幅
のスリットが、基板長手方向所定間隔ごとに形成されて
いることに特徴づけられている。According to a fifth aspect of the heater of the present application, two energizing electrodes extending in the longitudinal direction are formed on an insulating substrate, and a strip-shaped region sandwiched by the two energizing electrodes on the insulating substrate. The heating element layer is characterized in that the heating element layer is formed with narrow slits that are inclined with respect to the width direction of the insulating substrate at predetermined intervals in the substrate longitudinal direction. .
【００１２】本願の請求項６の加熱ヒータは、請求項５
の加熱ヒータにおいて、上記２本の通電用電極の間隔を
基板長手方向について一定とする一方、上記スリットの
間隔を、基板長手方向両端部に向かうほど拡大したこと
に特徴づけられている。The heater according to claim 6 of the present application is the heater according to claim 5.
The heater is characterized in that the distance between the two energizing electrodes is constant in the longitudinal direction of the substrate, while the distance between the slits is increased toward both ends in the longitudinal direction of the substrate.
【００１３】本願の請求項７の加熱ヒータは、請求項５
の加熱ヒータにおいて、上記２本の通電用電極の間隔
を、基板長手方向両端部が基板長手方向中間部よりも短
くなるようにする一方、上記スリットの間隔を、基板長
手方向について一定としたことに特徴づけられている。The heater according to claim 7 of the present application is the heater according to claim 5.
In the above heater, the distance between the two energizing electrodes is made shorter at both ends in the substrate longitudinal direction than at the middle part in the substrate longitudinal direction, while the interval between the slits is constant in the substrate longitudinal direction. Is characterized by.
【００１４】なお、本願の請求項８の発明は、請求項１
ないし７のいずれかの加熱ヒータを用いた加熱装置であ
り、電子写真プロセスが組み込まれた装置において、用
紙上に転写されたトナーを熱定着するためのものであ
る。The invention of claim 8 of the present application is the same as that of claim 1.
A heating device using any one of the heaters Nos. 1 to 7 for thermally fixing the toner transferred onto a sheet in a device incorporating an electrophotographic process.
【００１５】[0015]
【発明の作用および効果】請求項１の加熱ヒータにおい
ては、絶縁基板長手方向に延在する発熱体層の基板幅方
向両縁が、基板長手方向に相当長い距離において、同じ
く基板長手方向に延びるように形成された２つの通電用
電極に接触させられている。このことは、図６および図
７の従来構成が、基板長手方向に延びる発熱体の両端部
が電極に接続されている点と大きな対照をなすものであ
る。したがって、たとえ上記発熱体層が繰り返し発熱駆
動を受けても、通電用電極との間に生じる熱ストレスが
基板長手方向に長い距離に分散させられる。そのため、
上記熱ストレスが起因して発熱体と電極との間に断線が
生じるといった事態を効果的に回避することができる。According to the heater of the present invention, both edges of the heating element layer extending in the longitudinal direction of the insulating substrate in the substrate width direction also extend in the substrate longitudinal direction at a substantially long distance in the substrate longitudinal direction. The two current-carrying electrodes thus formed are brought into contact with each other. This is in sharp contrast to the conventional configurations of FIGS. 6 and 7 in which both ends of the heating element extending in the substrate longitudinal direction are connected to the electrodes. Therefore, even if the heating element layer is repeatedly driven to generate heat, the thermal stress generated between the heating element layer and the current-carrying electrode is dispersed over a long distance in the longitudinal direction of the substrate. for that reason,
It is possible to effectively avoid a situation where a disconnection occurs between the heating element and the electrode due to the thermal stress.
【００１６】また、通電用電極が基板長手方向に延びて
おり、したがって、この通電用電極が平均して発熱体が
発生する熱によって加熱させられるので、基板の両端部
にのみ電極が形成される従来例のように基板両端部に温
度低下が生じるといった傾向は抑制され、駆動状態にお
ける発熱体の温度分布を基板長手方向について平均化す
ることができる。Further, the current-carrying electrodes extend in the longitudinal direction of the substrate, and therefore, the current-carrying electrodes are heated by the heat generated by the heating element on average, so that the electrodes are formed only at both ends of the substrate. It is possible to suppress the tendency that the temperature is reduced at both ends of the substrate as in the conventional example, and it is possible to average the temperature distribution of the heating element in the driven state in the longitudinal direction of the substrate.
【００１７】そして、請求項２の加熱ヒータのように構
成することにより、発熱体の両端部の温度低下を容易に
補償することができる。すなわち、請求項２の加熱ヒー
タでは、両通電用電極間距離が基板長手方向両端部ほど
短くしてあり、したがって、基板長手方向両端部ほど、
両電極間抵抗が小さくなる。そのため、両端部ほど両通
電用電極間を流れる電流量を増大させて、発熱量を増大
することができる。これにより、たとえ基板長手方向両
端部からの熱放散量が多くなっていても、これに起因す
る基板長手方向両端部における温度低下を防止して、温
度分布を基板長手方向に平均化することができる。Further, by constituting the heating heater according to the second aspect, it is possible to easily compensate for the temperature drop at both ends of the heating element. That is, in the heater according to claim 2, the distance between the electrodes for energization is shorter at both ends in the substrate longitudinal direction.
The resistance between both electrodes becomes small. Therefore, the amount of current flowing between the two energizing electrodes can be increased toward both ends to increase the amount of heat generation. As a result, even if the amount of heat dissipation from both ends in the substrate longitudinal direction is large, it is possible to prevent the temperature drop at both ends in the substrate longitudinal direction due to this and average the temperature distribution in the substrate longitudinal direction. it can.
【００１８】上記請求項２の加熱ヒータは、発熱体の実
質幅を基板長手方向中間部より両端部ほど短くして温度
補償を行うものであるが、同等の効果は、請求項３およ
び４のようにすることによっても達成することができ
る。請求項４の加熱ヒータでは、両通電用電極間の領域
に形成される短絡用電極パターンの幅が、基板長手方向
両端部ほど拡張されており、したがって、発熱体の実質
的な幅が基板長手方向両端部ほど短くなる。そのため、
基板長手方向両端部ほど発熱体に流れる電流量が増大さ
せられ、請求項２の加熱ヒータと同じ温度補償効果を奏
することができる。According to the heater of claim 2, temperature compensation is performed by making the substantial width of the heating element shorter at both end portions than the middle portion in the longitudinal direction of the substrate, but the same effect can be obtained by the heaters of claims 3 and 4. Can also be achieved by doing so. In the heater according to claim 4, the width of the short-circuit electrode pattern formed in the region between the two energizing electrodes is extended toward both ends in the substrate longitudinal direction, and therefore, the substantial width of the heating element is the substrate longitudinal direction. It becomes shorter at both ends in the direction. for that reason,
The amount of current flowing through the heating element is increased toward both end portions in the substrate longitudinal direction, and the same temperature compensation effect as that of the heater according to claim 2 can be obtained.
【００１９】請求項１ないし４の加熱ヒータは、２本の
通電用電極間の領域に発熱体層を途切れなく形成したも
のであるが、請求項５ないし７の加熱ヒータでは、上記
２本の通電用電極間の発熱体層を、細幅のスリットによ
って基板長手方向に複数に分割している。これにより、
上記温度補償を行い易くなる。In the heater according to any one of claims 1 to 4, the heating element layer is continuously formed in the region between the two energizing electrodes. The heating element layer between the current-carrying electrodes is divided into a plurality of pieces in the longitudinal direction of the substrate by a narrow slit. This allows
This facilitates the temperature compensation.
【００２０】すなわち、温度補償の一つの方法を規定し
たのが請求項６の構成である。この請求項６の構成で
は、上記スリットで分断される発熱体層の基板長手方向
幅が基板長手方向端部に向かうほど長くなり、これによ
り、各スリットで分断される発熱体層の抵抗値が、基板
長手方向端部に向かうほど小さくなる。したがって、基
板長手方向端部ほど発熱体層に流れる電流が増大し、こ
れにともなって発熱量も増大する。これにより、基板両
端部からの熱放散を補償して、発熱体層の発熱量を、長
手方向について平均化することができる。That is, the structure of claim 6 defines one method of temperature compensation. In the structure of claim 6, the width of the heating element layer divided by the slit in the substrate longitudinal direction becomes longer toward the end portion in the substrate longitudinal direction, whereby the resistance value of the heating element layer divided by each slit is increased. , Becomes smaller toward the end of the substrate in the longitudinal direction. Therefore, the current flowing in the heating element layer increases toward the end portion in the longitudinal direction of the substrate, and the amount of heat generation increases accordingly. This makes it possible to compensate for heat dissipation from both ends of the substrate and average the amount of heat generated by the heating element layer in the longitudinal direction.
【００２１】また、上記温度補償の他の方法を規定した
のが請求項７の構成である。この請求項７の構成では、
上記スリットで分断される発熱体層の基板幅方向長さが
基板長手方向端部に向かうほど短くなり、これにより、
各スリットで分断される発熱体層の抵抗値が、基板長手
方向端部に向かうほど小さくなる。したがって、上記請
求項６の構成と同様の温度補償効果を奏することができ
る。Further, the structure of claim 7 defines another method of temperature compensation. In the structure of claim 7,
The substrate width direction length of the heating element layer divided by the slit becomes shorter toward the substrate longitudinal direction end portion, whereby,
The resistance value of the heating element layer divided by each slit becomes smaller toward the end portion in the substrate longitudinal direction. Therefore, it is possible to obtain the same temperature compensation effect as that of the structure of the sixth aspect.
【００２２】なお、請求項５ないし７の加熱ヒータにお
いては、上記スリットは、とくに細幅状とするととも
に、基板幅方向に対して傾斜させている。通常、この種
の加熱ヒータは、発熱体層を基板幅方向所定幅にわたっ
て基板幅方向に走行する対象物に実質的に接触させて、
その加熱を行うが、上記スリットを傾斜させていること
から、対象物に対する加熱の途切れ部をなくすことがで
き、加熱ムラをなくすことができる。In the heater of the fifth to seventh aspects, the slit has a particularly narrow width and is inclined with respect to the substrate width direction. Usually, this type of heater is such that the heating element layer is substantially brought into contact with an object running in the substrate width direction over a predetermined width in the substrate width direction,
The heating is performed, but since the slits are inclined, it is possible to eliminate the interruption of the heating of the object and eliminate the uneven heating.
【００２３】もちろん、加熱装置を小型化、軽量化、低
コスト化することができるとともに、通電後の待ち時間
をほとんどなくすことができるという、この種の加熱ヒ
ータの利点は、本願の上記各発明に係る加熱ヒータにお
いてもそのまま享受することができる。Of course, the advantage of this type of heater is that the heating device can be made smaller, lighter and less expensive, and the waiting time after energization can be almost eliminated. The heater according to the present invention can be enjoyed as it is.
【００２４】[0024]
【実施例の説明】以下、本願発明の好ましい実施例を、
図１ないし図５を参照して具体的に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below.
A specific description will be given with reference to FIGS. 1 to 5.
【００２５】図１および図２は、本願発明の加熱ヒータ
１の第一の実施例を示す。アルミナセラミック等からな
る平面視長矩形状の絶縁基板２の上面に、基板長手方向
に延びる２本の通電用電極３，４が形成される。この通
電用電極３，４は、たとえば銀ペーストを用いた厚膜印
刷法によって形成することができる。1 and 2 show a first embodiment of the heater 1 of the present invention. Two energizing electrodes 3 and 4 extending in the longitudinal direction of the substrate are formed on the upper surface of an insulating substrate 2 made of alumina ceramic or the like and having a rectangular shape in plan view. The energizing electrodes 3 and 4 can be formed by, for example, a thick film printing method using a silver paste.
【００２６】本実施例においては、図１に示されている
ように、一方の通電用電極３を直線状とする一方、他方
の通電用電極４を湾曲状に形成し、両通電用電極３，４
間の間隔が、基板中間部よりも両端部ほど短くなるよう
にしている。In the present embodiment, as shown in FIG. 1, one energizing electrode 3 is linear, while the other energizing electrode 4 is formed in a curved shape. , 4
The space between them is made shorter at both end portions than in the middle portion of the substrate.
【００２７】そして、上記２本の通電用電極３，４で挟
まれる基板長手方向帯状領域に発熱体層５が途切れなく
形成される。本実施例では、上記２本の通電用電極３，
４を形成した後、これらの通電用電極３，４を覆うよう
にして平面視矩形のパターンをもって、抵抗体被膜５ａ
を厚膜印刷法によって形成することにより、上記両通電
用電極３，４間の発熱体層５を形成している。この発熱
体層５の形成には、たとえば銀・パラジウムペーストを
用いることができる。Then, the heating element layer 5 is continuously formed in the strip-shaped region in the longitudinal direction of the substrate between the two energizing electrodes 3 and 4. In the present embodiment, the two current-carrying electrodes 3,
4, the resistor coating 5a is formed in a rectangular pattern in plan view so as to cover these energizing electrodes 3 and 4.
Is formed by a thick film printing method to form the heating element layer 5 between the two energizing electrodes 3 and 4. For example, a silver / palladium paste can be used to form the heating element layer 5.
【００２８】また、図２に表れているように、上記発熱
体層５をさらに覆うようにして、保護ガラスコーティン
グ６を施すことが、発熱体層５の磨耗を防止する上で望
ましい。なお、上記のようにして通電用電極３，４およ
び発熱体層５を形成する前に、ガラスペーストを用いて
蓄熱グレーズ層（図示略）を形成しておいてもよい。Further, as shown in FIG. 2, it is desirable that the protective glass coating 6 is applied so as to further cover the heating element layer 5 in order to prevent abrasion of the heating element layer 5. A heat storage glaze layer (not shown) may be formed using glass paste before forming the energizing electrodes 3 and 4 and the heating element layer 5 as described above.
【００２９】以上の構成において、両通電用電極３，４
間に通電を行うと、これら両通電用電極３，４間の帯状
領域に基板長手方向に延在する発熱体層５が発熱駆動さ
れる。この発熱体層５は、その帯状の形態の基板幅方向
両縁において、比較的長い距離において上記両通電用電
極３，４に接しているので、発熱体層５と両通電用電極
３，４間に生じる熱ストレスが基板長手方向の長い範囲
に分散される。したがって、発熱体層５が繰り返し駆動
されることによる熱ストレスが起因して発熱体層５と両
通電用電極３，４間が接続不良を起こすといった事態は
きわめて稀なことになる。この傾向は、本実施例のよう
に、両通電用電極３，４をその幅方向全体にわたって覆
うように抵抗体被膜５ａを形成することにより、より高
められる。また、発熱体層５は基板長手方向に途切れな
く連続しているので、たとえその長手方向一部に上記の
ような熱ストレスに起因する接触不良が生じたとして
も、全体として、両通電用電極３，４間の発熱体層５の
発熱駆動に支障が生じることは少ない。In the above structure, the electrodes 3 and 4 for energizing both electrodes are provided.
When electricity is applied between them, the heating element layer 5 extending in the longitudinal direction of the substrate is driven to generate heat in the strip-shaped region between the two energizing electrodes 3 and 4. Since the heating element layer 5 is in contact with the energizing electrodes 3 and 4 at a relatively long distance on both edges of the strip-shaped substrate in the width direction of the substrate, the heating element layer 5 and the energizing electrodes 3 and 4 are disposed. The thermal stress generated between them is distributed over a long range in the longitudinal direction of the substrate. Therefore, it is extremely rare for the heating element layer 5 to be repeatedly driven to cause thermal stress, resulting in poor connection between the heating element layer 5 and the electrodes 3, 4 for energization. This tendency is further enhanced by forming the resistor coating 5a so as to cover both the energizing electrodes 3 and 4 over the entire width direction as in the present embodiment. In addition, since the heating element layer 5 is continuous in the longitudinal direction of the substrate without interruption, even if the contact failure due to the thermal stress as described above occurs in a part of the longitudinal direction thereof, the electrodes for energizing both electrodes as a whole. The driving of heat generation of the heating element layer 5 between 3 and 4 rarely occurs.
【００３０】さらに、図１に表れているように、両通電
用電極３，４の間隔を、基板長手方向端部ほど短くして
おくと、発熱体層５の抵抗値が基板長手方向端部に向か
うほど小さくなる傾向となり、基板端部における発熱量
が、基板中間部における発熱量より大きくなる。したが
って、基板両端部からの熱放散に起因する基板端部の温
度が低下する傾向をなくして、温度分布を基板長手方向
について平均化することができる。Further, as shown in FIG. 1, when the distance between the current-carrying electrodes 3 and 4 is made shorter toward the end portion in the longitudinal direction of the substrate, the resistance value of the heating element layer 5 becomes the end portion in the longitudinal direction of the substrate. The heat generation amount at the substrate end portion becomes larger than that at the substrate middle portion. Therefore, it is possible to eliminate the tendency of the temperature of the substrate end portion lowering due to the heat dissipation from the both end portions of the substrate and average the temperature distribution in the substrate longitudinal direction.
【００３１】図３は、本願発明の加熱ヒータ１の第二の
実施例を示す。この実施例では、絶縁基板２の上面に、
互いに平行に延びる２本の通電用電極３，４を形成する
と同時に、これら通電用電極３，４間の領域に短絡用電
極パターン７を形成している。この短絡用電極パターン
７は、その基板幅方向の幅が基板長手方向端部に向かう
ほど拡大するようにしている。この短絡用電極パターン
７は、通電用電極３，４の形成と同時に、たとえば銀ペ
ーストを用いて形成される。そして、これら２本の通電
用電極３，４および短絡用電極パターン７の全体を覆う
ようにして、抵抗体被膜５ａを厚膜印刷法によって形成
することにより、２本の通電用電極３，４とこれらの間
の領域の短絡用電極パターン７との間の２カ所の帯状領
域に、途切れない発熱体層５，５が形成される。FIG. 3 shows a second embodiment of the heater 1 of the present invention. In this embodiment, on the upper surface of the insulating substrate 2,
At the same time as forming the two energizing electrodes 3 and 4 extending in parallel with each other, the short-circuiting electrode pattern 7 is formed in the region between the energizing electrodes 3 and 4. The width of the short-circuit electrode pattern 7 in the substrate width direction is increased toward the end portion in the substrate longitudinal direction. The short-circuit electrode pattern 7 is formed simultaneously with the formation of the current-carrying electrodes 3 and 4 by using, for example, a silver paste. Then, the resistor coating 5a is formed by a thick film printing method so as to cover the whole of the two energizing electrodes 3 and 4 and the short-circuiting electrode pattern 7, and thus the two energizing electrodes 3 and 4 are formed. Uninterrupted heating element layers 5, 5 are formed in two strip-shaped areas between the short-circuit electrode pattern 7 and the short-circuit electrode pattern 7 between these areas.
【００３２】図３に示す加熱ヒータ１の基本的な作用効
果は図１および図２に示すものと同様である。そして、
本実施例では、上記短絡用電極パターン７の形成によ
り、上記発熱体層５の抵抗値を基板長手方向端部ほど小
さくし、温度分布の平均化を行っている。The basic operation and effect of the heater 1 shown in FIG. 3 are the same as those shown in FIGS. And
In the present embodiment, the resistance value of the heating element layer 5 is made smaller toward the end portion in the substrate longitudinal direction by forming the short-circuiting electrode pattern 7, and the temperature distribution is averaged.
【００３３】図４は、本願発明の加熱ヒータ１の第三の
実施例を示す。この実施例の図１の実施例との相違は、
発熱体層５を、基板幅方向に対して傾斜する複数の細幅
状のスリット８によって基板長手方向複数の要素に分断
している点である。このようにすることにより、スリッ
ト８が分断する各発熱体層の要素の抵抗値の設定が容易
となり、発熱体層５全体としての温度分布をどのように
も設定することができる。もちろん、図に表れているよ
うに、発熱体層５の要素の電極間長さを基板長手方向端
部ほど短くしてその抵抗値を低めることにより、基板両
端部からの熱放散に起因する基板端部の温度が低下する
傾向をなくして、温度分布を基板長手方向について平均
化するといった対処も容易にすることができる。また、
上記細幅状のスリット８を傾斜状としていることによ
り、加熱対象物に対する加熱に途切れ部が生じることを
回避することができる。FIG. 4 shows a third embodiment of the heater 1 of the present invention. The difference between this embodiment and the embodiment of FIG. 1 is that
This is that the heating element layer 5 is divided into a plurality of elements in the substrate longitudinal direction by a plurality of narrow slits 8 inclined with respect to the substrate width direction. By doing so, it becomes easy to set the resistance values of the elements of each heating element layer that the slit 8 divides, and the temperature distribution of the heating element layer 5 as a whole can be set in any way. Of course, as shown in the figure, the inter-electrode length of the elements of the heating element layer 5 is made shorter toward the end portions in the longitudinal direction of the substrate to lower the resistance value thereof, so that the heat dissipation from both end portions of the substrate It is also possible to eliminate the tendency of the temperature of the end portion to decrease and to easily take measures such as averaging the temperature distribution in the longitudinal direction of the substrate. Also,
By forming the narrow slit 8 in an inclined shape, it is possible to avoid the occurrence of an interruption in heating the object to be heated.
【００３４】図５は、本願発明の加熱ヒータの第四の実
施例を示す。この実施例は、図４の第三の実施例の変形
例であり、２本の通電用電極３，４を平行とする一方、
上記スリット８で分断される発熱体層の要素幅を、基板
長手方向端部に向かうほど太幅化してその抵抗値を小さ
くしている。これにより、基板長手方向端部ほど発熱量
を大きくして、基板端部からの熱放散を補償して、温度
分布を平均化することができる。FIG. 5 shows a fourth embodiment of the heater of the present invention. This embodiment is a modification of the third embodiment of FIG. 4, in which the two energizing electrodes 3 and 4 are made parallel,
The element width of the heating element layer divided by the slit 8 is made wider toward the end portion in the substrate longitudinal direction to reduce the resistance value. As a result, the amount of heat generated can be increased toward the end of the substrate in the longitudinal direction, the heat dissipation from the end of the substrate can be compensated, and the temperature distribution can be averaged.
【００３５】なお、上記図４の第三の実施例および図５
の第四の実施例におけるスリットは、抵抗体被膜５ａの
印刷時に形成してもよいし、印刷後、トリミングの手法
によって形成してもよい。The third embodiment of FIG. 4 and FIG.
The slit in the fourth embodiment may be formed at the time of printing the resistor film 5a, or may be formed by a trimming method after printing.
【００３６】もちろん、この発明の範囲は上述した実施
例に限定されることはなく、特許請求の範囲に記載した
事項によって把握される本願発明の基本原理に基づくす
べての変形は、本願発明の範囲に含まれる。Of course, the scope of the present invention is not limited to the above-described embodiments, and all modifications based on the basic principle of the present invention grasped by the matters described in the claims are included in the scope of the present invention. include.
【図１】本願発明の加熱ヒータの第一の実施例の平面図
である。FIG. 1 is a plan view of a first embodiment of a heater according to the present invention.
【図２】図１のII−II線断面図である。FIG. 2 is a sectional view taken along line II-II in FIG.
【図３】本願発明の加熱ヒータの第二の実施例の平面図
である。FIG. 3 is a plan view of a second embodiment of the heater of the present invention.
【図４】本願発明の加熱ヒータの第三の実施例の平面図
である。FIG. 4 is a plan view of a third embodiment of the heater of the present invention.
【図５】本願発明の加熱ヒータの第四の実施例の平面図
である。FIG. 5 is a plan view of a fourth embodiment of the heater of the present invention.
【図６】従来例の平面図である。FIG. 6 is a plan view of a conventional example.
【図７】従来例の平面図である。FIG. 7 is a plan view of a conventional example.
１ 加熱ヒータ ２ 絶縁基板 ３ 通電用電極 ４ 通電用電極 ５ 発熱体層 ６ 保護ガラスコーティング ７ 短絡用電極パターン ８ スリット 1 Heater 2 Insulating Substrate 3 Energizing Electrode 4 Energizing Electrode 5 Heating Element Layer 6 Protective Glass Coating 7 Shorting Electrode Pattern 8 Slit
Claims (8)
通電用電極を形成する一方、上記絶縁基板上における上
記２本の通電用電極で挟まれる帯状領域に、発熱体層を
途切れなく形成したことを特徴とする、加熱ヒータ。1. A heating element layer is continuously formed on an insulating substrate in a strip-shaped region sandwiched by the two conducting electrodes while forming two conducting electrodes extending in the longitudinal direction on the insulating substrate. A heating heater characterized by being formed.
本の通電用電極を、その長手方向両端部における間隔が
長手方向中間部における間隔よりも短くなるように形成
したことを特徴とする、加熱ヒータ。2. The heater according to claim 1, wherein
A heater, characterized in that the current-carrying electrodes are formed such that the distance between both longitudinal end portions thereof is shorter than the distance between the longitudinal intermediate portions thereof.
通電用電極と、この２本の通電用電極の間を延びる短絡
用電極パターンとを形成する一方、上記絶縁基板上にお
ける上記通電用電極および短絡用電極パターンで挟まれ
る各帯状領域に、発熱体層を途切れなく形成したことを
特徴とする、加熱ヒータ。3. On the insulating substrate, two current-carrying electrodes extending in the longitudinal direction and a short-circuiting electrode pattern extending between the two current-carrying electrodes are formed, while the current-carrying on the insulating substrate is performed. A heater, characterized in that a heating element layer is continuously formed in each strip-shaped region sandwiched by the electrode for short circuit and the electrode pattern for short circuit.
絡用電極パターンを、上記２本の通電用電極の両方また
は一方との間隔が、長手方向両端部が長手方向中間部よ
りも短くなるように形成したことを特徴とする、加熱ヒ
ータ。4. The heater according to claim 3, wherein the short-circuiting electrode pattern is arranged such that the distance between the short-circuiting electrode pattern and both or one of the two energizing electrodes is shorter at both longitudinal end portions than at the longitudinal middle portion. A heater, characterized in that
通電用電極を形成する一方、上記絶縁基板上における上
記２本の通電用電極で挟まれる帯状領域に発熱体層を形
成するものにおいて、上記発熱体層には、絶縁基板幅方
向に対して傾斜する細幅のスリットが、基板長手方向所
定間隔ごとに形成されていることを特徴とする、加熱ヒ
ータ。5. A heating element layer is formed on an insulating substrate while two conducting electrodes extending in the longitudinal direction are formed, and a heating element layer is formed on a band-shaped region sandwiched by the two conducting electrodes on the insulating substrate. In the heating heater, a slit having a narrow width that is inclined with respect to the width direction of the insulating substrate is formed at predetermined intervals in the substrate longitudinal direction.
本の通電用電極の間隔を基板長手方向について一定とす
る一方、上記スリットの間隔を、基板長手方向両端部に
向かうほど拡大したことを特徴とする、加熱ヒータ。6. The heater according to claim 5, wherein
A heater, characterized in that the interval between the current-carrying electrodes is constant in the substrate longitudinal direction, while the interval between the slits is enlarged toward both ends in the substrate longitudinal direction.
本の通電用電極の間隔を、基板長手方向両端部が基板長
手方向中間部よりも短くなるようにする一方、上記スリ
ットの間隔を、基板長手方向について一定としたことを
特徴とする、加熱ヒータ。7. The heater according to claim 5, wherein
A heater, characterized in that the intervals between the two current-carrying electrodes are made shorter at both ends in the substrate longitudinal direction than at the middle part in the substrate longitudinal direction, while the intervals between the slits are constant in the substrate longitudinal direction. .
タを用いた加熱装置。8. A heating device using the heater according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31495793A JP3547779B2 (en) | 1993-12-15 | 1993-12-15 | Heater and heating device using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31495793A JP3547779B2 (en) | 1993-12-15 | 1993-12-15 | Heater and heating device using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07169560A true JPH07169560A (en) | 1995-07-04 |
| JP3547779B2 JP3547779B2 (en) | 2004-07-28 |
Family
ID=18059707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31495793A Expired - Fee Related JP3547779B2 (en) | 1993-12-15 | 1993-12-15 | Heater and heating device using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3547779B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000340345A (en) * | 1999-05-31 | 2000-12-08 | Kyocera Corp | Heater |
| JP2010049864A (en) * | 2008-08-20 | 2010-03-04 | Rohm Co Ltd | Heater |
| JP2017026785A (en) * | 2015-07-22 | 2017-02-02 | 東芝ライテック株式会社 | Heater and image forming apparatus |
| JP2017173580A (en) * | 2016-03-24 | 2017-09-28 | キヤノン株式会社 | Heater and image heating device including the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57501308A (en) * | 1980-08-28 | 1982-07-22 | ||
| JPS58179785U (en) * | 1982-05-26 | 1983-12-01 | 東京コスモス電機株式会社 | sheet heating element |
| JPH0439888A (en) * | 1990-06-05 | 1992-02-10 | Murata Mfg Co Ltd | Plane-like heating body |
| JPH0569893U (en) * | 1992-02-25 | 1993-09-21 | シャープ株式会社 | Ceramic heater heating element |
-
1993
- 1993-12-15 JP JP31495793A patent/JP3547779B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57501308A (en) * | 1980-08-28 | 1982-07-22 | ||
| JPS58179785U (en) * | 1982-05-26 | 1983-12-01 | 東京コスモス電機株式会社 | sheet heating element |
| JPH0439888A (en) * | 1990-06-05 | 1992-02-10 | Murata Mfg Co Ltd | Plane-like heating body |
| JPH0569893U (en) * | 1992-02-25 | 1993-09-21 | シャープ株式会社 | Ceramic heater heating element |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000340345A (en) * | 1999-05-31 | 2000-12-08 | Kyocera Corp | Heater |
| JP2010049864A (en) * | 2008-08-20 | 2010-03-04 | Rohm Co Ltd | Heater |
| JP2017026785A (en) * | 2015-07-22 | 2017-02-02 | 東芝ライテック株式会社 | Heater and image forming apparatus |
| JP2017173580A (en) * | 2016-03-24 | 2017-09-28 | キヤノン株式会社 | Heater and image heating device including the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3547779B2 (en) | 2004-07-28 |
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