JPH0355826B2 - - Google Patents
Info
- Publication number
- JPH0355826B2 JPH0355826B2 JP16484185A JP16484185A JPH0355826B2 JP H0355826 B2 JPH0355826 B2 JP H0355826B2 JP 16484185 A JP16484185 A JP 16484185A JP 16484185 A JP16484185 A JP 16484185A JP H0355826 B2 JPH0355826 B2 JP H0355826B2
- Authority
- JP
- Japan
- Prior art keywords
- heat generating
- thermistor
- roller
- fixing device
- temperature
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 19
- 230000004044 response Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 10
- 230000020169 heat generation Effects 0.000 description 5
- 238000001454 recorded image Methods 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000004043 responsiveness Effects 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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
ンスイツチにしても発熱ローラが記録画像を加熱
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, the heat generating roller is used as the main switch. The disadvantage of this method is that it takes a long time to reach a predetermined temperature at which the recorded image can be heated and melted (this is called warming-up time). Various improvements have been made to reduce this warming-up time, one of which is disclosed in Japanese Patent Application Laid-Open No. 123580/1983.
According to this, a thin layer electric resistor is formed on the outer peripheral surface of the heating roller, and the voltage applied to the thin layer electric resistor is made 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、消費電力が小さく、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, it is an object of the present invention to provide a fixing device that has a small heat capacity, excellent temperature responsiveness, low power consumption, 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、回転方向にそつて区
分されかつ独立的に駆動可能であつて発熱抵抗体
を含む複数の発熱領域が外周面に備わつている発
熱ローラと、各発熱領域に設けてあるサーミスタ
と、上記サーミスタの抵抗値の変化により上記発
熱領域の温度を制御する温度制御回路と、駆動す
るべき発熱領域とそれに対応する上記サーミスタ
とを遂次的に選択する選択手段とより構成されて
いる。(Means for Solving the Problems) A fixing device according to the present invention is provided with a plurality of heat generating regions on an outer circumferential surface that are segmented along the rotational direction, can be driven independently, and include heat generating resistors. A heat generating roller, a thermistor provided in each heat generating area, a temperature control circuit that controls the temperature of the heat generating area by changing the resistance value of the thermistor, and a heat generating area to be driven and the corresponding thermistor are successively installed. and a selection means for making a selective selection.
［作用］
本発明の発熱ローラは、その外周面に回転方向
にそつて区分されかつ独立的に駆動可能であつて
発熱抵抗体を含む複数の発熱領域が備わつたもの
であるので、熱容量が小さく瞬時に作動温度に到
達する。各発熱領域はローラ回転時に選択手段を
介して選択され遂次的に駆動される。各発熱領域
の温度はその上に形成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] The heat generating roller of the present invention has a plurality of heat generating regions on its outer peripheral surface that are divided along the rotational direction, can be driven independently, and include heat generating resistors, so that the heat capacity is small. It is small and reaches operating temperature instantly. Each heat generating area is selected through the selection means when the roller rotates and is sequentially driven. The temperature of each heat generating area is directly detected by a thermistor formed thereon 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、両者が矢印方向
に回転することにより記録紙３０がその間に挟ま
れて送られる。記録紙３０上の未定者の記録画像
３１は発熱ローラ１０と回転ローラ２０との間を
通過する間に定着せしめられる。発熱ローラ１０
は、この実施例では八つに分割された発熱領域
A1，A2〜A8をその外周面に備えている。[Embodiment] In FIG. 1, a heat generating roller 10 and a rotary roller 20 are installed facing each other, and when both rotate in the direction of the arrow, the recording paper 30 is conveyed while being sandwiched between them. The recorded image 31 of the unidentified person on the recording paper 30 is fixed while passing between the heat generating roller 10 and the rotating roller 20. Heat generating roller 10
In this example, the heating area is divided into eight parts.
A 1 , A 2 to A 8 are provided on its outer peripheral surface.
そこで各発熱領域の構造を第２図および第３図
をも参照して説明する。 Therefore, the structure of each heat generating region will be explained with reference to FIGS. 2 and 3.
各発熱領域A1，A2〜A8は、絶縁性ローラ１１
上に形成された発熱抵抗体１２とそれに接続する
一対の駆動電極１３，１４とからなつている。絶
縁性ローラ１１は円柱状をなし、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たものである。この
絶縁性ローラ１１上には、メつキまたはスパツタ
リングや蒸着によりCu，Ni，Crなどの駆動電極
１３，１４が第３図示のように形成され、この実
施例では、駆動電極１３，１４は複数の電極要素
１３ａ，１４ａからなつている。各電極要素１３
ａ，１４ａは交互に位置してそれぞれ左右の端子
電極１３ｂ，１４ｂに接続して櫛歯状となつてい
る。そして駆動電極１３，１４を形成した後で、
その上から発熱抵抗体１２がスパツタリングや蒸
着またはCVD法により形成されている。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。発熱抵抗体１２の上に
は、絶縁性被膜１５が形成されている。絶縁性被
覆１５は発熱抵抗体１２の保護膜としても機能す
るように、耐磨耗性に富んだものが使用され、一
例としてはSiO2やTaO2などが適している。絶縁
性被覆１５の上面には、各発熱領域A1，A2…A8
に対応して、温度によつて抵抗値が変化するサー
ミスタ１６が形成されている。サーミスタ１６
は、本実施例では薄膜状のサーミスタ材料層１６
ａおよびそれをサンドイツチ状に挟持する下部電
極１６ｂと上部電極１６ｃとで構成されている。
下部電極１６ｂは一体に形成されて共通電極にな
つているが、サーミスタ材料層１６ａと上部電極
１６ｃは各発熱領域A1，A2…A8に対応して分割
されている。また下部電極１６ｂはサーミスタ材
料層１６ａおよび上部電極１６ｃよりも幅広に形
成されてその右側の部分が露出している。なおサ
ーミスタ材料層１６ａ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法により形成したものであ
る。下部電極１６ｂ，上部電極１６ｃの材料とし
ては、発熱抵抗体１２の駆動電極１３，１４のそ
れと同じものが使用可能である。 Each heat generating area A 1 , A 2 to A 8 has an insulating roller 11
It consists of a heating resistor 12 formed on top and a pair of drive electrodes 13 and 14 connected thereto. The insulating roller 11 has a cylindrical shape and 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. On this insulating roller 11, driving electrodes 13 and 14 made of Cu, Ni, Cr, etc. are formed by plating, sputtering, or vapor deposition as shown in the third figure. In this embodiment, the driving electrodes 13 and 14 are It consists of a plurality of electrode elements 13a and 14a. Each electrode element 13
a, 14a are alternately located and connected to left and right terminal electrodes 13b, 14b, respectively, forming a comb-teeth shape. After forming the drive electrodes 13 and 14,
A heating resistor 12 is formed thereon by sputtering, vapor deposition, or CVD. As the heating resistor 12, a heating resistor material used in thermal heads can be used, and Ta 2 N is suitable as an example. An insulating film 15 is formed on the heating resistor 12 . The insulating coating 15 is made of a highly abrasion-resistant material so as to function as a protective film for the heating resistor 12, and suitable materials include SiO 2 and TaO 2 , for example. On the upper surface of the insulating coating 15, each heat generating area A 1 , A 2 ...A 8
Corresponding to this, a thermistor 16 whose resistance value changes depending on the temperature is formed. Thermistor 16
In this embodiment, the thermistor material layer 16 is a thin film.
a, and a lower electrode 16b and an upper electrode 16c that sandwich it in a sandwich-like pattern.
The lower electrode 16b is integrally formed and serves as a common electrode, but the thermistor material layer 16a and the upper electrode 16c are divided corresponding to the heat generating areas A 1 , A 2 . . . A 8 . Further, the lower electrode 16b is formed wider than the thermistor material layer 16a and the upper electrode 16c, and its right side portion is exposed. The thermistor material layer 16a is formed by sputtering, vapor deposition, or CVD using NiO, CoO, and MnO alone or in combination. The same material as that of the drive electrodes 13 and 14 of the heating resistor 12 can be used for the lower electrode 16b and the upper electrode 16c.
第１図に示すように、発熱抵抗体１２の端子電
極１３ｂ，１４ｂおよびサーミスタ１６の電極１
６ｂ，１６ｃには、選択手段の一例としてのブラ
シ４１〜４４が接触するように固定的に配設して
あり、発熱ローラ１０の回転にしたがつて端子電
極１３ｂ，１４ｂおよび電極１６ｂ，１６ｃと遂
次的に接触可能である。ブラシ４１〜４４によつ
て選択された特定の発熱領域の発熱抵抗体１２と
それに対応するサーミスタ１６は、このブラシ４
１〜４４を介して第４図示の温度制御回路に遂次
的に接続される。温度制御回路は、この実施例で
は、抵抗５１，基準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
電圧差に応じた出力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
５３ｂに応じて発熱抵抗体１２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。 As shown in FIG. 1, the terminal electrodes 13b and 14b of the heating resistor 12 and the electrode 1 of the thermistor 16
Brushes 41 to 44 as an example of selection means are fixedly disposed in contact with the terminal electrodes 13b and 14b and the electrodes 16b and 16c as the heating roller 10 rotates. Can be contacted sequentially. The heat generating resistor 12 and the corresponding thermistor 16 in a specific heat generating area selected by the brushes 41 to 44 are connected to the brush 4.
The temperature control circuit shown in FIG. 4 is successively connected to the temperature control circuit shown in FIG. In this embodiment, the temperature control circuit includes a resistor 51, a reference 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, so that an output 53c is generated according to the voltage difference between the two. It's summery. The drive circuit 54 is configured to generate a voltage to be applied to the heating resistor 12 in accordance with the output 53b of the differential amplifier 53. Also, the drive circuit 54
is designed to operate only when receiving a printing command 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４図示の駆動回路５４も動作状態になる。
電子写真記録装置本体によつて画像３１が記録さ
れた記録紙３０は、発熱ローラ１０と回転ローラ
２０との間に送られ、両者の間を通過する間に以
下のようにして画像３１が定着される。今、例え
ば発熱領域A1が記録紙３０と接触しているとす
ると、このときこの発熱領域A1に対応する端子
電極１３ｂ，１４ｂにはブラシ４１，４２が接触
していることになる。そしてブラシ４１，４２を
介して駆動回路５４によつて生ぜしめられる電圧
が発熱領域A1の駆動電極１３，１４間に供給さ
れ、されに対応する発熱抵抗体１２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
抵抗値を示すので、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１２は急速に温められる。発熱抵
抗体１２の温度が上昇するにつれてサーミスタ１
６の抵抗値は低下していき、差動増幅器５３の入
力端子５３ａ，５３ｂの電圧が小さくなつてい
く。それによつて差動増幅器５３の出力５３の電
圧も低くなり、発熱抵抗体１２が所望の温度に到
達したところで平衝を保つようになる。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、かつ各発熱領域の
熱容量が十分に小さいことと相俟つて、各発熱領
域が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。ついで発熱
ローラ１０の発熱領域A2が記録紙３０に接触す
るようになると、この発熱領域の発熱抵抗体１２
とサーミスタ１６とがブラシ４１〜４４を介して
第４図示の温度制御装置に接続され、上記と同様
にして発熱領域A2が駆動される。そして発熱１
０の回転に伴つて発熱領域A3，A4…A8が逐次的
に駆動され、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３１が
記録紙３０に定着される。 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 started, and the drive circuit 54 shown in the fourth figure is also put into operation.
The recording paper 30 on which the image 31 has been recorded by the main body of the electrophotographic recording apparatus is sent between the heating roller 10 and the rotating roller 20, and while passing between the two, the image 31 is fixed as follows. be done. For example, if the heat generating area A1 is in contact with the recording paper 30, then the brushes 41 and 42 are in contact with the terminal electrodes 13b and 14b corresponding to the heat generating area A1 . The voltage generated by the drive circuit 54 is then supplied through the brushes 41 and 42 between the drive electrodes 13 and 14 in the heat generating area A1 , and the corresponding heat generating resistor 12 generates Joule heat. Initially, the thermistor 16 exhibits a high resistance value, so the voltage at the input terminal 53b is sufficiently higher than the reference voltage at the input terminal 53a, so the voltage at the output 53c of the differential amplifier 53 is also high, and accordingly the drive circuit 54 also generates high voltage. As a result, the heating resistor 12 is rapidly warmed up. As the temperature of the heating resistor 12 rises, the thermistor 1
The resistance value of the differential amplifier 53 decreases, and the voltage at the input terminals 53a, 53b of the differential amplifier 53 decreases. As a result, the voltage at the output 53 of the differential amplifier 53 also becomes low, and the temperature is maintained even when the heating resistor 12 reaches a desired temperature. In this way, a high voltage is applied to the heating resistor 12 at first, and as the temperature rises, the applied voltage is reduced to maintain the desired temperature. In total, the rise time for each heat generating area to reach the desired temperature is:
It is much shorter than known fixing devices. Next, when the heat generating area A2 of the heat generating roller 10 comes into contact with the recording paper 30, the heat generating resistor 12 in this heat generating area
and thermistor 16 are connected to the temperature control device shown in the fourth figure via brushes 41 to 44, and the heat generating area A2 is driven in the same manner as described above. and fever 1
As the roller 0 rotates, the heat generating areas A 3 , A 4 , ... A 8 are sequentially driven, and while the recording paper 30 passes between the heat generating roller 10 and the rotation roller 20 , the recorded image 31 is transferred to the recording paper 30 . It will be established.
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、上記実施例は発熱ローラ１０の回転時
に記録紙３０と接触する発熱領域A1〜A8の一つ
を駆動するようにしているが、それに後続する発
熱領域も合わせて駆動するようにすることも、ブ
ラシ４１〜４４の形状を変更することによつて簡
単に実現することができる。 For example, in the above embodiment, when the heat generating roller 10 rotates, one of the heat generating areas A 1 to A 8 that comes into contact with the recording paper 30 is driven, but the following heat generating areas are also driven at the same time. This can also be easily achieved by changing the shapes of the brushes 41-44.
また、各全発熱領域A1〜A8は、第５図示のよ
うに、発熱抵抗体１１２を駆動電極１１３，１１
４でサンドイツチ状に挟んだ構造であつてもよ
い。なお下方の駆動電極１１３は発熱領域A1〜
A8間に跨つて絶縁性ローラ１１１の外周部に全
周的に形成してある共通電極としているが、上部
の駆動電極１１４と同様に各発熱領域毎に分割し
てもよい。 Further, each of the total heat generating regions A 1 to A 8 connects the heat generating resistor 112 to the drive electrodes 113 and 11 as shown in the fifth figure.
4 may be sandwiched in a sandwich-like structure. Note that the lower drive electrode 113 has a heat generating area A 1 ~
Although the common electrode is formed all around the outer periphery of the insulating roller 111 across the A 8 area, it may be divided into each heat generating area similarly to the upper drive electrode 114.
さらにサーミスタについても第６図示の構造に
変更することができる。このサーミスタ１１６
は、第１図示のブラシ４３，４４が接触する一対
の電極１１６ｂ，１１６ｃが絶縁性ローラ１１１
の軸方向に一定の間隔に隔てて絶縁性被覆１１５
上に形成してあり、その間に両者と接触するよう
にサーミスタ材料１１６ａが披着形成してある。
発熱抵抗体１１２とその駆動電極１１３，１１４
は第５図示のものと同じである。 Furthermore, the structure of the thermistor can also be changed to that shown in FIG. This thermistor 116
In this case, a pair of electrodes 116b and 116c that the brushes 43 and 44 shown in the first diagram contact are connected to an insulating roller 111.
Insulating coatings 115 are spaced at regular intervals in the axial direction of the
A thermistor material 116a is formed thereon so as to be in contact with both.
Heat generating resistor 112 and its driving electrodes 113, 114
is the same as that shown in FIG.
［発明の効果］
本発明の定着装置は、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、ブラシなどの選択手段を介して各発熱
領域を逐次的に駆動するようにしていることと相
俟つて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
が各発熱領域に接合しているから、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] The fixing device of the present invention has a small heat capacity and excellent temperature responsiveness, so no warming up is required, and each heat generating region is sequentially driven through a selection means such as a brush. Combined with this, lower power consumption can be achieved. In addition, a thermistor that detects the heat generation temperature of the heat generation roller is bonded to each heat generation area, so there is no air gap between the thermistor and the heat generation roller as in the conventional case, resulting in accurate and fast response. temperature control is possible.
第１図は本発明に係る定着装置の斜視図、第２
図はその要部拡大断面図、第３図は発熱抵抗体の
駆動電極を一部切欠して示す展開平面図、第４図
は温度制御回路図、第５図は発熱領域の構造の他
の実施例を示す拡大断面図、第６図はサーミスタ
の構造の他の実施例の拡大断面図である。
１０……発熱ローラ、１２……発熱抵抗体、１
６，１１６……サーミスタ、４１〜４４……選択
手段（ブラシ）、５０……温度制御回路、５２…
…基準電源、５３……差動増幅器、５４……抵抗
体駆動回路、A1〜A8……発熱領域。
FIG. 1 is a perspective view of a fixing device according to the present invention, and FIG.
The figure is an enlarged sectional view of the main part, Figure 3 is a developed plan view with a part cut away showing the drive electrode of the heat generating resistor, Figure 4 is a temperature control circuit diagram, and Figure 5 is a diagram showing other structures of the heat generating region. FIG. 6 is an enlarged sectional view of another embodiment of the thermistor structure. 10... Heat generating roller, 12... Heat generating resistor, 1
6,116... Thermistor, 41-44... Selection means (brush), 50... Temperature control circuit, 52...
... Reference power supply, 53 ... Differential amplifier, 54 ... Resistor drive circuit, A 1 to A 8 ... Heat generation area.
Claims (1)
可能であつて発熱抵抗体を含む複数の発熱領域が
外周面に備わつている発熱ローラと、 各発熱領域に設けてあるサーミスタと、 上記サーミスタの抵抗値の変化により上記発熱
領域の温度を制御する温度制御回路と、 駆動すべき発熱領域とそれに対応する上記サー
ミスタとを遂次的に選択する選択手段と 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、上記選択手
段は、上記発熱ローラの回転時に上記記録紙と接
触する発熱領域および／またはそれに後続する発
熱領域とそれに対応するサーミスタとを選択する
ものである電子写真記録装置の定着装置。 ３ 特許請求の範囲第１項または第２項におい
て、上記選択手段はブラシである電子写真記録装
置の定着装置。 ３ 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。 ４ 特許請求の範囲第１項または第４項におい
て、上記温度制御回路は印字命令を受けたときに
作動するものである電子写真記録装置の定着装
置。[Scope of Claims] 1. A heat generating roller having a plurality of heat generating areas on its outer circumferential surface which are divided along the rotational direction and can be driven independently and each including a heat generating resistor; a thermistor; a temperature control circuit that controls the temperature of the heat generating region by changing the resistance value of the thermistor; and selection means that sequentially selects the heat generating region to be driven and the corresponding thermistor. A fixing device for an electrophotographic recording device, characterized in that: 2. In claim 1, the selection means is an electronic device that selects a heat generating area that comes into contact with the recording paper when the heat generating roller rotates, and/or a heat generating area that follows the heat generating area and a thermistor corresponding thereto. Fixing device for photographic recording equipment. 3. The fixing device for an electrophotographic recording apparatus according to claim 1 or 2, wherein the selection means is a brush. 3. 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. 4. The fixing device of an electrophotographic recording apparatus according to claim 1 or 4, wherein the temperature control circuit operates when receiving a printing command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16484185A JPS6224288A (en) | 1985-07-25 | 1985-07-25 | Fixing device of electrophotographic recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16484185A JPS6224288A (en) | 1985-07-25 | 1985-07-25 | Fixing device of electrophotographic recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6224288A JPS6224288A (en) | 1987-02-02 |
| JPH0355826B2 true JPH0355826B2 (en) | 1991-08-26 |
Family
ID=15800937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16484185A Granted JPS6224288A (en) | 1985-07-25 | 1985-07-25 | Fixing device of electrophotographic recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6224288A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06186877A (en) * | 1992-10-21 | 1994-07-08 | Ricoh Co Ltd | Fixing device |
| FR2784759B1 (en) * | 1998-10-16 | 2002-08-02 | Sagem | PRINTING POWDER FIXING OVEN |
| JP2008268413A (en) * | 2007-04-18 | 2008-11-06 | Murata Mach Ltd | Fixing device |
| JP5262943B2 (en) * | 2009-04-14 | 2013-08-14 | 株式会社リコー | Fixing means and image forming apparatus |
| JP6806461B2 (en) | 2016-04-25 | 2021-01-06 | キヤノン株式会社 | Image heating device and image forming device |
-
1985
- 1985-07-25 JP JP16484185A patent/JPS6224288A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6224288A (en) | 1987-02-02 |
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