JPH0558543B2 - - Google Patents
Info
- Publication number
- JPH0558543B2 JPH0558543B2 JP60157491A JP15749185A JPH0558543B2 JP H0558543 B2 JPH0558543 B2 JP H0558543B2 JP 60157491 A JP60157491 A JP 60157491A JP 15749185 A JP15749185 A JP 15749185A JP H0558543 B2 JPH0558543 B2 JP H0558543B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermistor
- roller
- resistor
- heat generating
- 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.)
- Expired - Lifetime
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Control Of Resistance Heating (AREA)
- Resistance Heating (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、電子写真プロセスなどにより記録紙
上に転写された未定着の記録画像を定着させるた
めの電子写真記録装置の定着装置に関するもので
ある。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fixing device for an electrophotographic recording device for fixing an unfixed recorded image transferred onto recording paper by an electrophotographic process or the like. .
［従来の技術とその問題点］
発熱ローラ方式による公知の定着装置は、その
多くがローラ内部にハロゲンランプなどの熱源を
有したものであつて、熱容量が大きいためにメイ
ンスイツチをオンにしても発熱ローラが記録画像
（未定着のトナー）を加熱溶融定着できる所定の
温度に達するまでの時間（これをウオーミングア
ツプ時間という。）が長くかかる欠点があつた。
このウオーミングアツプ時間の短縮を計るために
種々の改良がなされているが、その一つに特開昭
56−123580号公報がある。これによると、発熱ロ
ーラの外周面に薄層電気抵抗体が形成してあり、
この薄層電気抵抗体への印加電圧をウオーミング
アツプ時に定着処理時よりも大としている。しか
し、この改良された従来技術でも、依然として熱
容量が大きいためにウオーミングアツプ後も薄層
電気抵抗体に常時電圧を印加し続けていることに
何等変わりはなく、消費電力が大きかつた。[Prior art and its problems] Most of the known fixing devices using heat-generating rollers have a heat source such as a halogen lamp inside the roller, and because of their large heat capacity, even if the main switch is turned on, There is a drawback that it takes a long time for the heating roller to reach a predetermined temperature at which the recorded image (unfixed toner) can be heated, melted and fixed (this is called warming-up time).
Various improvements have been made to shorten this warming-up time, one of which is the
There is a publication No. 56-123580. According to this, a thin electrical resistor is formed on the outer peripheral surface of the heat generating roller.
The voltage applied to this thin layer electrical resistor is set higher during warming up than during fixing processing. However, even with this improved conventional technology, since the heat capacity is still large, there is no change in the fact that a voltage is constantly applied to the thin-layer electrical resistor even after warming up, resulting in large power consumption.
また、これらの公知の定着装置にあつては、発
熱ローラの温度をコントロールするための温度セ
ンサーは、ローラ表面から少し隔たつて設置され
ている。これは、温度センサーがローラ表面に接
していると表面の温度むらを生じたり、ローラ表
面が損傷を受ける不都合が生じるためであつて、
そのため温度センサーとローラ表面との間隔を所
望の間隔に調整して設置する必要があつた。 Further, in these known fixing devices, a temperature sensor for controlling the temperature of the heat generating roller is installed at a distance from the roller surface. This is because if the temperature sensor is in contact with the roller surface, there will be inconveniences such as uneven temperature on the surface and damage to the roller surface.
Therefore, it was necessary to adjust and install the distance between the temperature sensor and the roller surface to a desired distance.
また、この温度センサーは、ローラ表面から離
れてその温度を正確にコントロールする必要があ
るために、応答性に優れたものが要求される。し
かるに、この公知の定着装置は、発熱ローラが回
転しているときと回転の止つているときとで、ロ
ーラの表面温度がかなり変動し、この温度変動は
熱応答性の高い温度センサーほど影響を受け易い
傾向にある。これを解決するために、例えば特開
昭56−165174号公報では、温度センサーの前方に
衝立を設置し、この衝立によつて発熱ローラによ
つて熱せられその回転によつて乱気流となるロー
ラ表面の空気層の温度センサーへの影響が小さく
なるようにしていた。しかしこれによつても正確
な温度管理は難しく、むしろ部品点数が増大し組
立調整が面倒になる欠点を招く結果となつてい
た。 Furthermore, since this temperature sensor needs to be separated from the roller surface and accurately control its temperature, it is required to have excellent responsiveness. However, in this known fixing device, the surface temperature of the heat generating roller fluctuates considerably between when it is rotating and when it is not rotating, and this temperature fluctuation has less of an effect on a temperature sensor that is highly responsive to heat. They tend to be easily accepted. In order to solve this problem, for example, in JP-A-56-165174, a screen is installed in front of the temperature sensor, and the surface of the roller is heated by the heat-generating roller, causing turbulence due to its rotation. The effect of the air layer on the temperature sensor was reduced. However, even with this, accurate temperature control is difficult, and the number of parts increases, resulting in troublesome assembly and adjustment.
［発明の目的］
そこで本発明は、熱容量が小さくて温度応答性
に優れ、かつ正確に温度管理を行うことのできる
定着装置を提供することを目的とするものであ
る。[Object of the Invention] Therefore, an object of the present invention is to provide a fixing device that has a small heat capacity, has excellent temperature responsiveness, and can accurately control temperature.
（問題点を解決するための手段）
本発明による定着装置は、外周面に薄膜技術に
より形成された発熱抵抗体とサーミスタとが積層
状に形成されている発熱ローラと、上記サーミス
タの抵抗値の変化により上記発熱抵抗体の温度を
制御する温度制御回路とを具備する。(Means for Solving the Problems) A fixing device according to the present invention includes a heat generating roller in which a heat generating resistor and a thermistor formed by thin film technology are formed on the outer peripheral surface in a laminated manner, and a resistance value of the thermistor. and a temperature control circuit that controls the temperature of the heating resistor by changing the temperature of the heating resistor.
［作用］
本発明の発熱抵抗体は薄膜技術により非常に薄
く形成されているために熱容量が小さく瞬時に作
動温度に到達する。発熱抵抗体の発熱温度は、絶
縁被膜を介して密着配設されたサーミスタにより
直接的に検出されて温度制御回路にフイードバツ
クされ、所望の温度にコントロールされる。[Function] Since the heat generating resistor of the present invention is formed very thinly using thin film technology, it has a small heat capacity and reaches the operating temperature instantaneously. The heat generation temperature of the heat generating resistor is directly detected by a thermistor closely disposed through an insulating coating, and fed back to a temperature control circuit to control the temperature to a desired temperature.
［実施例］
第１図において、発熱ローラ１０と回転ローラ
２０とが対向的に設置してあり、その間を記録紙
３０が通過する間にこの記録紙上に形成されてい
る記録画像が定着せしめられる。回転ローラ２０
の外周部にはシリコンゴムなどの弾性材２１が被
覆してある。発熱ローラ１０の構造について説明
すると、絶縁性ローラ１１の外周面のほぼ全域
に、サンドイツチ状に下部電極１２、発熱抵抗体
１３、上部電極１４がスパツタリング、蒸着、
CVD法などの方法により順次被着形成してある。
絶縁性ローラ１１は、Al2O3などのセラミツクス
やガラスなど絶縁性であつてかつ断熱係数の高い
材料にて形成されている。下部電極１２および上
部電極１４の材料としては、Cu，Ni，Crなどが
使用できる。発熱抵抗体１２としては、サーマル
ヘツドに使用されている発熱抵抗材料が使用可能
であつて、一例としてはTa2Ｎが適している。上
部電極１４の上には、SiO2などの絶縁性被膜１
５が形成してある。絶縁被膜１５の外周面には、
温度によつて抵抗値が変化するサーミスタ１６が
形成してあり、その左右端部が側部電極１７，１
８に接合している。サーミスタ１７は、NiO，
CoO，MnOの単体またはその複数種の組み合せ
をスパツタリングや蒸着またはCVD法などの方
法により形成したものである。側部電極１７，１
８の材料としては、発熱抵抗体１２用の電極１
２，１４のそれと同じものが使用可能である。そ
してサーミスタ１６の外周面には、耐摩耗性を付
与するためのTaO2などの絶縁性の保護層１９が
形成してある。[Example] In FIG. 1, a heat generating roller 10 and a rotating roller 20 are installed facing each other, and while a recording paper 30 passes between them, a recorded image formed on the recording paper is fixed. . Rotating roller 20
The outer periphery of is coated with an elastic material 21 such as silicone rubber. To explain the structure of the heat generating roller 10, a lower electrode 12, a heat generating resistor 13, and an upper electrode 14 are formed in a sandwich pattern on almost the entire outer peripheral surface of the insulating roller 11 by sputtering, vapor deposition, etc.
They are sequentially deposited using a method such as CVD.
The insulating roller 11 is made of a material that is insulating and has a high heat insulation coefficient, such as ceramics such as Al 2 O 3 or glass. As the material for the lower electrode 12 and the upper electrode 14, Cu, Ni, Cr, etc. can be used. As the heat generating resistor 12, heat generating resistive materials used in thermal heads can be used, and Ta 2 N is suitable as an example. An insulating film 1 such as SiO 2 is placed on the upper electrode 14.
5 is formed. On the outer peripheral surface of the insulating coating 15,
A thermistor 16 whose resistance value changes depending on the temperature is formed, and its left and right ends are connected to side electrodes 17 and 1.
It is joined to 8. Thermistor 17 is made of NiO,
CoO, MnO alone or a combination of these are formed by sputtering, vapor deposition, CVD, or other methods. Side electrode 17,1
As the material of 8, electrode 1 for heating resistor 12 is used.
2 and 14 can be used. An insulating protective layer 19 made of TaO 2 or the like is formed on the outer peripheral surface of the thermistor 16 to provide wear resistance.
発熱抵抗体１３の電極１２，１４およびサーミ
スタ１６の電極１７，１８は外部に露出してお
り、接続手段の一例としてのブラシ４１〜４４を
介して第２図示の温度制御回路５０に接続されて
いる。温度制御回路５０は、この実施例では、抵
抗５１、基準電源５２、差動増幅器５３、抵抗体
駆動回路５４によつて構成されている。差動増幅
器５３には、基準電源５２の基準電圧が入力端子
５３ａに、サーミスタ１６にかかる電圧が入力端
子５３ｂにそれぞれ供給されており、両者の電圧
差に応じて出力５３ｃを発生するようになつてい
る。駆動回路５４は、差動増幅器５３の出力５３
ｃに応じて発熱抵抗体１３に印加すべき電圧を発
生するようになつている。また駆動回路５４は、
図示しない電子写真記録装置本体またはそれが接
続されるコンピユータ側から印字命令を受けたと
きだけ動作するようになつている。 The electrodes 12 and 14 of the heating resistor 13 and the electrodes 17 and 18 of the thermistor 16 are exposed to the outside and are connected to a temperature control circuit 50 shown in the second diagram via brushes 41 to 44 as an example of connection means. There is. In this embodiment, the temperature control circuit 50 includes a resistor 51, a reference power source 52, a differential amplifier 53, and a resistor drive circuit 54. In the differential amplifier 53, the reference voltage of the reference power supply 52 is supplied to an input terminal 53a, and the voltage applied to the thermistor 16 is supplied to an input terminal 53b, and an output 53c is generated according to the voltage difference between the two. ing. The drive circuit 54 outputs the output 53 of the differential amplifier 53.
The voltage to be applied to the heating resistor 13 is generated in accordance with c. Further, the drive circuit 54 is
It operates only when a printing command is received from the main body of the electrophotographic recording apparatus (not shown) or a computer to which it is connected.
つぎに本発明に係る定着装置の動作について説
明する。 Next, the operation of the fixing device according to the present invention will be explained.
本発明に係る定着装置は、そのメインスイツチ
が入れられても、第１図示の発熱ローラ１０は直
ちに駆動されないし、また回転も始めない。電子
写真記録装置本体またはそれが接続されたコンピ
ユータ側から印字命令が発せられると、第１図示
の発熱ローラ１０および回転ローラ２０が起動
し、第２図示の駆動回路５４も動作状態になる。
すなわち、ブラシ４１，４２を介して駆動回路５
４によつて生ぜしめられる電圧が発熱抵抗体１３
の電極１２，１４間に供給されることによつて、
発熱抵抗体１３がジユール熱を発生する。最初の
うちはサーミスタ１６は高い抵抗値を示し、入力
端子５３ｂの電圧が入力端子５３ａの基準電圧よ
りも十分に高いので差動増幅器５３の出力５３ｃ
の電圧も高く、それに応じて駆動回路５４も高い
電圧を発生する。これにより発熱抵抗体１３は急
速に温められる。発熱抵抗体１３の温度が上昇す
るにつれてサーミスタ１６の抵抗値は低下してい
き、作動増幅器５３の入力端子５３ａ，５３ｂの
電圧差が小さくなつていく。それによつて差動増
幅器５３の出力５３ｃの電圧も低くなり、発熱抵
抗体１３が所望の温度に到達したところで平衡を
保つようになる。このように発熱抵抗体１２は最
初のうちは高い電圧が印加されその温度上昇と共
に印加電圧が減少して所望の温度を保つように制
御され、かつ熱容量が十分に小さいことと相俟つ
て、所望温度に到達するまでの立上がり時間は公
知の定着装置に比して格段に短い。そして発熱ロ
ーラ１０の回転に伴つて記録紙３０が発熱ローラ
１０と回転ローラ２０との間を通過する間に記録
画像が記録紙３０に溶融定着される。 In the fixing device according to the present invention, even when the main switch is turned on, the heating roller 10 shown in the first figure is not immediately driven and does not start rotating. When a printing command is issued from the main body of the electrophotographic recording apparatus or the computer to which it is connected, the heat generating roller 10 and rotating roller 20 shown in the first figure are activated, and the drive circuit 54 shown in the second figure is also put into operation.
That is, the drive circuit 5
4 is applied to the heating resistor 13.
By being supplied between the electrodes 12 and 14,
The heating resistor 13 generates Joule heat. Initially, the thermistor 16 exhibits a high resistance value, and since the voltage at the input terminal 53b is sufficiently higher than the reference voltage at the input terminal 53a, the output 53c of the differential amplifier 53
The voltage is also high, and the drive circuit 54 also generates a high voltage accordingly. As a result, the heating resistor 13 is rapidly warmed up. As the temperature of the heating resistor 13 increases, the resistance value of the thermistor 16 decreases, and the voltage difference between the input terminals 53a and 53b of the operational amplifier 53 decreases. As a result, the voltage at the output 53c of the differential amplifier 53 also becomes low, and balance is maintained when the heating resistor 13 reaches a desired temperature. In this way, a high voltage is initially applied to the heating resistor 12, and as the temperature rises, the applied voltage is reduced to maintain the desired temperature. The rise time to reach the temperature is much shorter than in known fixing devices. As the heating roller 10 rotates, the recording paper 30 passes between the heating roller 10 and the rotating roller 20, and the recorded image is fused and fixed onto the recording paper 30.
なお本発明は特許請求の範囲によつてのみ特定
されるものであつて、その技術思想を逸脱しない
範囲であれば種々の改変が可能である。 Note that the present invention is specified only by the claims, and various modifications can be made without departing from the technical idea thereof.
例えば、発熱抵抗体１３の電極１２，１４は絶
縁性ローラ１１の外周面に同一平面的に形成した
櫛歯状のものであつてもよいし、サーミスタ１６
の電極１７，１８も発熱抵抗体１３の電極１２，
１４のようにサーミスタ１６をサンドイツチ状に
挟む構造のものであつてもよい。さらには、サー
ミスタ１６を発熱抵抗体１３の下部に配置するこ
とも可能である。また、上記実施例ではサーミス
タ１６を発熱抵抗体１３の全領域に設けている
が、部分的に設けてもよい。 For example, the electrodes 12 and 14 of the heating resistor 13 may be comb-shaped electrodes formed on the same plane on the outer peripheral surface of the insulating roller 11, or the thermistor 16
The electrodes 17 and 18 of the heating resistor 13 are also the electrodes 12 and 18 of the heating resistor 13.
14, the thermistor 16 may be sandwiched in a sandwich-like structure. Furthermore, it is also possible to arrange the thermistor 16 below the heating resistor 13. Further, in the above embodiment, the thermistor 16 is provided over the entire region of the heating resistor 13, but it may be provided only partially.
［発明の効果］
本発明のによれば、発熱抵抗体とサーミスタと
は薄膜技術により非常に薄く形成されており熱容
量が小さくかつ温度応答性に優れているのでウオ
ーミングアツプが不要であり、低消費電力化が達
成できる。それに加えて、発熱ローラの発熱温度
を検出するサーミスタが発熱ローラ上に直接的に
配設してあるから、サーミスタと発熱ローラとの
間に従来のように空気層が存在せず、したがつて
正確かつ高速応答の温度制御が可能である。[Effects of the Invention] According to the present invention, the heating resistor and thermistor are formed very thinly using thin film technology, have a small heat capacity, and are excellent in temperature responsiveness, so warming-up is not required and power consumption is low. Electricity can be achieved. In addition, since the thermistor that detects the heat generation temperature of the heat generation roller is placed directly on the heat generation roller, there is no air layer between the thermistor and the heat generation roller as in the conventional case. Accurate and fast-response temperature control is possible.
第１図は本発明に係る定着装置を部分的に断面
して示す正面図、第２図は温度制御回路図であ
る。
１０……発熱ローラ、１３……発熱抵抗体、１
６……サーミスタ、４１〜４４……接続手段（ブ
ラシ）、５０……温度制御回路、５２……基準電
源、５３……作動増幅器、５４……抵抗体駆動回
路。
FIG. 1 is a partially sectional front view of a fixing device according to the present invention, and FIG. 2 is a temperature control circuit diagram. 10... Heat generating roller, 13... Heat generating resistor, 1
6... Thermistor, 41-44... Connection means (brush), 50... Temperature control circuit, 52... Reference power supply, 53... Operational amplifier, 54... Resistor drive circuit.
Claims (1)
体とサーミスタとが積層状に形成されている発熱
ローラと、上記サーミスタの抵抗値の変化により
上記発熱抵抗体の温度を制御する温度制御回路と
を具備することを特徴とする電子写真記録装置の
定着装置。 ２ 特許請求の範囲第１項において、上記温度制
御回路は、基準電圧と上記サーミスタにかかる変
動電圧とが供給される差動増幅器とその出力に応
答して上記発熱抵抗体を駆動する抵抗体駆動回路
とからなつている電子写真記録装置の定着装置。[Scope of Claims] 1. A heat generating roller in which a heat generating resistor and a thermistor formed by thin film technology are formed on the outer peripheral surface in a laminated manner, and the temperature of the heat generating resistor is controlled by changing the resistance value of the thermistor. 1. A fixing device for an electrophotographic recording device, comprising: a temperature control circuit. 2. In claim 1, the temperature control circuit includes a differential amplifier to which a reference voltage and a variable voltage applied to the thermistor are supplied, and a resistor driver that drives the heating resistor in response to the output thereof. A fixing device for an electrophotographic recording device consisting of a circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15749185A JPS6218579A (en) | 1985-07-17 | 1985-07-17 | Fixing device for electrophotographic recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15749185A JPS6218579A (en) | 1985-07-17 | 1985-07-17 | Fixing device for electrophotographic recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6218579A JPS6218579A (en) | 1987-01-27 |
| JPH0558543B2 true JPH0558543B2 (en) | 1993-08-26 |
Family
ID=15650846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15749185A Granted JPS6218579A (en) | 1985-07-17 | 1985-07-17 | Fixing device for electrophotographic recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6218579A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63312361A (en) * | 1987-06-15 | 1988-12-20 | Mitsubishi Kasei Vinyl Co | Agricultural synthetic resin covering material |
| JPS6415783A (en) * | 1987-07-09 | 1989-01-19 | Tokai Rubber Ind Ltd | Fixing roller |
| JP2011137973A (en) * | 2009-12-28 | 2011-07-14 | Murata Machinery Ltd | Heat roll and image forming apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55164861A (en) * | 1979-06-11 | 1980-12-22 | Toshiba Corp | Forming method of resistance heating element layer in heating roller for heat fixing |
| JPS58175554U (en) * | 1982-05-19 | 1983-11-24 | キヤノン株式会社 | Heat roller fuser |
| JPS59106151U (en) * | 1982-12-29 | 1984-07-17 | 株式会社リコー | heating roller |
-
1985
- 1985-07-17 JP JP15749185A patent/JPS6218579A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6218579A (en) | 1987-01-27 |
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