JPS63192070A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPS63192070A JPS63192070A JP2539687A JP2539687A JPS63192070A JP S63192070 A JPS63192070 A JP S63192070A JP 2539687 A JP2539687 A JP 2539687A JP 2539687 A JP2539687 A JP 2539687A JP S63192070 A JPS63192070 A JP S63192070A
- Authority
- JP
- Japan
- Prior art keywords
- surface layer
- roller
- layer
- fixing device
- fixing
- 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
- 239000000463 material Substances 0.000 claims abstract description 42
- 239000002344 surface layer Substances 0.000 claims abstract description 36
- 239000010410 layer Substances 0.000 claims abstract description 21
- 239000012790 adhesive layer Substances 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims abstract 2
- 239000011347 resin Substances 0.000 abstract description 9
- 229920005989 resin Polymers 0.000 abstract description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 229920002379 silicone rubber Polymers 0.000 abstract description 4
- 239000004945 silicone rubber Substances 0.000 abstract description 4
- 239000004020 conductor Substances 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract description 2
- 229920002313 fluoropolymer Polymers 0.000 abstract 1
- 230000003449 preventive effect Effects 0.000 abstract 1
- 239000011247 coating layer Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229920001774 Perfluoroether Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004813 Perfluoroalkoxy alkane Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
- G03G15/2057—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating relating to the chemical composition of the heat element and layers thereof
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電子写真複写機、レーザービームプリンター、
ファクシミリ等の画像形成装置において使用される定着
装置に関し、特には互いに′圧接して回転する一対のロ
ーラ間に未定着像を有する記録材を通過させることによ
り、記録材上に未定着像を定着する定着装置に関するも
のである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to electrophotographic copying machines, laser beam printers,
Regarding a fixing device used in an image forming apparatus such as a facsimile machine, in particular, the unfixed image is fixed on the recording material by passing the recording material with the unfixed image between a pair of rollers that rotate while in pressure contact with each other. The present invention relates to a fixing device.
（従来技術）
従来より、上述のようなローラ定着装置としては、加熱
及び加圧によって定着を行う加熱定着装置と、加圧力の
みによって定着を行う圧力定着装置が知られている。(Prior Art) Conventionally, as the above-described roller fixing device, there are known a heat fixing device that performs fixing using heat and pressure, and a pressure fixing device that performs fixing only by applying pressure.
加熱定着装置に使用されるローラは、Ａ１やＳｕＳ等の
基材上に、耐熱性シリコーンゴム層やＰＴＦＥ、ＰＦＡ
等のフッ素系樹脂層または両者混合の耐熱性層が被覆さ
れて形成されているのが一般的である。そして、上記被
覆層は各々顕画材（以下トナーと称する。）に対する離
型性を良くするため種々の改良が施され、いわゆるトナ
ーのオフセット現象を防止するようにしている。このオ
フセット防止の性能を向上させるために、上記のような
被覆層の導電性物質を混入することにより、被覆層の電
気抵抗値を減少させることが・特公昭５８−２３６２６
号公報等によって知られている。The rollers used in heat fixing devices are made of a heat-resistant silicone rubber layer, PTFE, or PFA on a base material such as A1 or SuS.
It is generally formed by being coated with a fluororesin layer such as or a heat-resistant layer of a mixture of the two. Various improvements have been made to each of the above-mentioned coating layers in order to improve their releasability from the developing material (hereinafter referred to as toner), and to prevent the so-called toner offset phenomenon. In order to improve this offset prevention performance, it is possible to reduce the electrical resistance value of the coating layer by mixing a conductive substance in the coating layer as described above.
It is known from publications such as No.
一方、圧力定着装置に使用されるローラの場合も一般的
に鋼材等で構成しているため、電気抵抗値が低いことが
知られている。On the other hand, rollers used in pressure fixing devices are also generally made of steel or the like, and are therefore known to have a low electrical resistance value.
〔発明が解決しようとしている問題点〕しかしながら、
近年画像形成装置自体が小型化される傾向にあり、これ
により定着部と転写部との間の距離が使用される記録紙
の長さよりも短くなり、定着部に記録紙の先端部が到達
した時には未だ記録紙の後方が転写部に残っているとい
う状態、つまり記録紙が定着部と転写部との間に跨がっ
て存在するという状態が起こる。ところがこのような状
態において、上述のように定着用ローラの電気抵抗が低
いと、特に高温環境下で記録材の電気抵抗が低いとき、
転写帯電電荷がリークし、結果として転写不良を起す場
合があった。[Problem that the invention is trying to solve] However,
In recent years, image forming devices themselves have tended to become smaller, and as a result, the distance between the fixing section and the transfer section has become shorter than the length of the recording paper being used, making it difficult for the leading edge of the recording paper to reach the fixing section. Sometimes, a state occurs in which the rear part of the recording paper still remains in the transfer section, that is, a state in which the recording paper straddles between the fixing section and the transfer section. However, in such a state, if the electrical resistance of the fixing roller is low as described above, especially when the electrical resistance of the recording material is low in a high temperature environment,
There have been cases in which transfer charges leak, resulting in transfer defects.
このため、定着用ローラの抵抗を高くすることが転写部
は防止には有効であるが、定着用ローラの抵抗を高くす
ると、定着用ローラ同志或は定着用ローラと記録紙との
摺動によりローラが摩擦帯電し、且つローラ表面がチャ
ージアップする為、オフセット防止に対し性能が劣る場
合があった。For this reason, increasing the resistance of the fixing roller is effective in preventing the transfer part, but if the resistance of the fixing roller is made high, it may be caused by sliding between the fixing rollers or between the fixing roller and the recording paper. Since the roller is frictionally charged and the roller surface is charged up, the performance in preventing offset may be poor.
（問題点を解決する為の手段〕
本発明は上述従来の欠点に鑑みて成されたものであり、
その目的とする処はオフセット防止性能を向上させたロ
ーラを有する定着装置を提供することにある。この目的
を達成するために本発明はローラの表面層を低抵抗化し
、且つローラ全体としては所定の抵抗値を有する状態或
いは絶縁としたものである。(Means for solving the problems) The present invention has been made in view of the above-mentioned conventional drawbacks,
The objective is to provide a fixing device having a roller with improved anti-offset performance. In order to achieve this object, the present invention lowers the resistance of the surface layer of the roller, and the roller as a whole has a predetermined resistance value or is insulated.
即ち、具体的には本発明は、記録材を挟持搬送して定着
を行う一対のローラのうち、少なくとも一方のローラは
、基材と、表面層と、その基材と表面層との間に設けら
れた中間層とを有し、その中間層の体積抵抗値が１０１
０Ω・ｃｍより大きく、且つ表面層の体積抵抗値が１０
１０Ω・ｃｍ以下であフて、その表面層を電気的にフロ
ート状態とすることにより、ローラ表面層の電荷密度を
均一にすると共に、ローラ表面の局部的或いは部分的な
チャージアップを防止することで、ローラのオフセット
防止性能を向上させるものである。That is, specifically, in the present invention, among a pair of rollers that nip and convey a recording material and fix it, at least one of the rollers is arranged between a base material, a surface layer, and a space between the base material and the surface layer. an intermediate layer provided, the volume resistivity of the intermediate layer is 101
larger than 0Ω・cm, and the volume resistivity of the surface layer is 10
By making the surface layer electrically floating with a resistance of 10Ω・cm or less, the charge density of the roller surface layer can be made uniform, and local or partial charge-up on the roller surface can be prevented. This improves the offset prevention performance of the roller.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第１図は本発明の定着装置の一実施例を示している。FIG. 1 shows an embodiment of the fixing device of the present invention.
定着ローラ１はＳｕＳやＡＪ２等の中空円筒基材１３上
にブライマーと称する接着層等から成る中間層１２を有
し、その上に耐熱性シリコーンゴムやＰＴＦＥ（ポリテ
トラフロロエチレン樹脂）、ＰＦＡ（パーフロロアルコ
キシ樹脂）等のフッ素系樹脂にカーボンや金属粉等の導
電性物質の粉体状あるいは繊維状のものを含有した表面
層１１を有してなる。定着ローラ１には加熱源３が内設
されている。The fixing roller 1 has an intermediate layer 12 made of an adhesive layer called a brimer on a hollow cylindrical base material 13 such as SuS or AJ2, and a heat-resistant silicone rubber, PTFE (polytetrafluoroethylene resin), PFA ( The surface layer 11 is made of a fluorine-based resin such as perfluoroalkoxy resin (perfluoroalkoxy resin) containing a powdered or fibrous conductive substance such as carbon or metal powder. A heat source 3 is installed inside the fixing roller 1 .
一方、加圧ローラー２は例えば芯金上に、・耐熱性シリ
コーンゴムやスポンジ等の被覆層を有してなる。On the other hand, the pressure roller 2 has, for example, a coating layer of heat-resistant silicone rubber, sponge, etc. on a core metal.
そして、上記定着ローラ１及び加圧ローラ２は不図示の
加圧手段により、少なくとも定着時互いに圧接され、不
図示の駆動手段により図示矢印方向にそれぞれ回転駆動
される。尚、この加圧手段及び駆動手段としては公知の
手段を適用することができる。The fixing roller 1 and the pressure roller 2 are brought into pressure contact with each other by a pressure means (not shown) at least during fixing, and are each driven to rotate in the direction of the arrow shown in the figure by a drive means (not shown). Note that known means can be applied as the pressurizing means and the driving means.
このような構成において、上記定着ローラ１と加圧ロー
ラ２との間を、未定着トナー像Ｔが形成された紙等の記
録材４が通過することにより、記録材４上に未定着トナ
ー像Ｔが加熱定着される。In such a configuration, the recording material 4 such as paper on which the unfixed toner image T is formed passes between the fixing roller 1 and the pressure roller 2, so that the unfixed toner image is formed on the recording material 4. T is heat-fixed.
ここで、上記定着ローラ１について更に詳細に説明する
と、基材１３は電気的に接地されていても良いし、フロ
ート状態であっても良い。また、表面層１１はその体積
抵抗値が１０１０Ω・０ｍ以下とされる。そして、表面
層１１と基材１３との間での体積抵抗値が１０１０Ω・
ｃｍより大きければよく、そのためには中間層１２の材
質として上記体積抵抗値抗値を有するようなものを特に
選択すればよい。これにより、表面層１１は電気的にフ
ロート状態とされる。Here, to explain the fixing roller 1 in more detail, the base material 13 may be electrically grounded or may be in a floating state. Further, the surface layer 11 has a volume resistivity of 10 10 Ω·0 m or less. The volume resistance value between the surface layer 11 and the base material 13 is 1010Ω・
cm, and for this purpose, a material having the above-mentioned volume resistivity value may be selected as the material for the intermediate layer 12. Thereby, the surface layer 11 is brought into an electrically floating state.
次に、このような定着ローラを使用することによる効果
について、Ｎ２図に示す画像形成装置を用いて説明する
。図において、５は感光ドラムで、この感光ドラム５に
対し帯電器６による帯電、露光光学系７による像露光が
施されて潜像が形成され、感光ドラム５上の潜像は現像
器８により現像される。そして、この現像されたトナー
像は矢印Ａ方向から搬送される記録材４上に転写帯電器
９により転写される。転写後の記録材４は感光ドラム５
から分離された後、搬送手段１０によって定着装置Ｆに
搬送される。定着装置Ｆに搬送された記録材４は、前述
の通りの一対の定着用ローラ１及び２によってトナー像
が定着された後、機外に排出される。一方、転写後の感
光ドラム５上に残留するトナーはクリーナー１４により
除去清掃される。尚、前述の画像形成プロセスは周知で
あるのでその詳細については説明を省略する。Next, the effects of using such a fixing roller will be explained using an image forming apparatus shown in Diagram N2. In the figure, 5 is a photosensitive drum. The photosensitive drum 5 is charged by a charger 6 and subjected to image exposure by an exposure optical system 7 to form a latent image. The latent image on the photosensitive drum 5 is formed by a developer 8. Developed. This developed toner image is then transferred by a transfer charger 9 onto the recording material 4 that is conveyed in the direction of arrow A. The recording material 4 after transfer is transferred to the photosensitive drum 5
After being separated from the paper, it is transported to the fixing device F by the transport means 10. The recording material 4 conveyed to the fixing device F has the toner image fixed thereon by the pair of fixing rollers 1 and 2 as described above, and then is discharged outside the machine. On the other hand, the toner remaining on the photosensitive drum 5 after the transfer is removed and cleaned by the cleaner 14. Incidentally, since the above-mentioned image forming process is well known, a detailed explanation thereof will be omitted.
第２図の画像形成装置においては、転写部と定着ニップ
部との間の距＠ｆＬよりも記録材４の長さが長くなって
いる。このように１、記録材４の長さが距＠ｉより大き
い場合、図示のように記録材４の先端がローラ対１．２
にくわえ込まれた時には未だ記録材４の後方部が転写部
において転写中である。従って、この場合、転写帯電器
９による帯電電荷は記録材４を介して定着部に至ること
になる。特に、記録材が紙であると、湿度８０％を越え
ると紙の表面抵抗が１０９〜１０’Ωになり、瞬時に定
着部に電荷は移動しようとする。この時、定着ローラ亀
が１０１０Ω以下、より顕著には１０８Ω以下だと転写
帯電電荷がリークし、転写部の転写帯電電荷が減少して
転写抜けが発生する。この関係を距離ＩＬ師１４０ｍｍ
。In the image forming apparatus shown in FIG. 2, the length of the recording material 4 is longer than the distance @fL between the transfer section and the fixing nip section. In this way, 1. When the length of the recording material 4 is greater than the distance @i, the leading edge of the recording material 4 is positioned at the roller pair 1.2 as shown in the figure.
When the recording material 4 is held in its mouth, the rear portion of the recording material 4 is still being transferred in the transfer section. Therefore, in this case, the charges charged by the transfer charger 9 reach the fixing section via the recording material 4. In particular, when the recording material is paper, when the humidity exceeds 80%, the surface resistance of the paper becomes 109 to 10'Ω, and the electric charges tend to instantly move to the fixing section. At this time, if the fixing roller resistance is less than 10 10 Ω, more significantly less than 10 8 Ω, the transfer charge will leak, the transfer charge at the transfer portion will decrease, and transfer omission will occur. Based on this relationship, the distance IL is 140 mm.
.
転写帯電電圧を５．４ｋＶ、記録材に８０ｇｒ紙を用い
、３２．５℃、９０％下で得た実験結果を第３図に示す
。FIG. 3 shows the experimental results obtained at a transfer charging voltage of 5.4 kV, a recording material of 80 gr paper, and a temperature of 32.5° C. under 90%.
第３図において、縦軸は転写抜けを示すベタ黒画像濃度
で紙先端から距離λ以降の画像濃度である。定着ローラ
の抵抗を１０１３Ω以上とした時の画像濃度を１，０と
すると、１０Ｉ０Ω以下から転写抜けが現われ、１０６
Ω以下で顕著となる事が図から理解できる。これはＪ！
４１４０ｍｍであって、機械によっては１の減少や転写
電界強度もそれぞれ異なるが、およそ１ｏ１０Ω以上あ
れば実質的に弊害は無いと考えられる。In FIG. 3, the vertical axis indicates the density of a solid black image indicating transfer omission, and the density of the image after a distance λ from the leading edge of the paper. If the image density is 1.0 when the resistance of the fixing roller is 1013Ω or more, then transfer failure appears from 10I0Ω or less, and 106
It can be seen from the figure that this becomes noticeable below Ω. This is J!
4140 mm, and although the reduction of 1 and the transfer electric field strength vary depending on the machine, it is considered that if it is approximately 10Ω or more, there is no substantial problem.
また、定着ローラの表面層抵抗値とオフセット性に関し
ては基材に約φ２５ｍｍのＡｎを用い、中間層に１０１
３Ω・ｃｍ以上のブライマーを約１０μｍコートし、表
面層としてＰＴＦＥ樹脂にカーボンを混入した層を２０
〜３０μｍにコーティングして用い、カーボンの添加量
を変化させて、オフセット性を目視感覚で測定した。条
体としてはローラー周速約５２ｍｍ／ｓｅｃ。Regarding the surface layer resistance value and offset property of the fixing roller, we used An of approximately 25 mm in diameter for the base material, and 101 mm for the intermediate layer.
Approximately 10 μm of brimer of 3 Ω cm or more is coated, and a layer of PTFE resin mixed with carbon is coated with 20 μm of PTFE resin as a surface layer.
It was coated to a thickness of ~30 μm, and the amount of carbon added was varied, and the offset property was visually measured. As for the strip, the peripheral speed of the roller is approximately 52 mm/sec.
表面ンに度約１８０℃で、トナーとして一成分磁性トナ
ーと非磁性トナー両者で観測した。The surface temperature was measured at approximately 180° C. for both one-component magnetic toner and non-magnetic toner.
結果は第４図に示す如く、ローラの表面層の抵抗値が１
０１０Ω・ｃｍ以下、より好ましくは・１０８Ωｃｍオ
ーダー以下で良好なオフセット性が得られた。これはＡ
ｌ１．基材を本体側に接地してもフロート状態にしても
大差はなかった。これはオフセットの少ない抵抗値領域
においては、基材をフロート状態にしても、或いは基材
を接地して中間層を絶縁化して、表面層がある程度チャ
ージアップしても、表面層に局部的あるいは部分的なチ
ャージアップによる電荷密度の疎密がなく、従って記録
材上のトナーの堆積電荷パターンを乱すことがないため
オフセット性が向上するものと考えられる。As shown in Figure 4, the results show that the resistance value of the surface layer of the roller is 1.
Good offset properties were obtained at a value of 0.010 Ω·cm or less, more preferably of the order of 10 8 Ω·cm or less. This is A
l1. There was no significant difference whether the base material was grounded to the main body or floating. This means that in the resistance value region with little offset, even if the base material is in a floating state, or even if the base material is grounded and the intermediate layer is insulated and the surface layer is charged up to some extent, local or It is thought that the offset property is improved because there is no difference in charge density due to partial charge-up, and therefore the charge pattern deposited on the toner on the recording material is not disturbed.
次に、本発明の他の実施例について、第５図及び第１６
図に基づいて説明する。この実施例においても、前述の
ような抵抗値を満足させることにより効果が得られるも
のである。Next, regarding other embodiments of the present invention, FIGS.
This will be explained based on the diagram. In this embodiment as well, effects can be obtained by satisfying the resistance value as described above.
第５図は中間層１２′をＰＦＡ樹脂等の熱収縮チューブ
で構成し、表面層１１′にＰＦＡ樹脂に導電材を混入し
たチューブで被覆したものである。これによれば、前記
実施例がブライマーや表面層をコーティングするのに対
して、製造上工程が簡略できる利点を有する。In FIG. 5, the intermediate layer 12' is composed of a heat-shrinkable tube made of PFA resin or the like, and the surface layer 11' is covered with a tube made of PFA resin mixed with a conductive material. This has the advantage that the manufacturing process can be simplified, as opposed to the above-mentioned embodiment in which the brimer and surface layer are coated.
また、第６図はさらに他の実施例を示すもので、中間層
を特にコーテイング材を用いず、基材１３のＡｆＬを酸
化させ、酸化アルミ等の絶縁被覆１５にした後に表面層
１１′をコーティングしたり、チュービングしても良い
。これも製造上工程の簡略化が図れる。Further, FIG. 6 shows still another embodiment, in which no particular coating material is used for the intermediate layer, AfL of the base material 13 is oxidized to form an insulating coating 15 such as aluminum oxide, and then a surface layer 11' is formed. May be coated or tubed. This also simplifies the manufacturing process.
尚、前述の各実施例においては、本発明を定着ローラに
適用した場合を示したが、本発明はこれに限らず、前記
加圧ローラに適用しても良いし、必要であれば両方のロ
ーラに適用しても良い。In each of the above embodiments, the present invention is applied to the fixing roller, but the present invention is not limited to this, and the present invention may be applied to the pressure roller, or if necessary, both It may also be applied to rollers.
また、前記実施例は定着装置の一例として加熱定着装置
を説明したが、本発明は圧力定着装置に適用することも
でき、この場合には例えば中間層を構造的に強度を有し
且つ高抵抗のセラミックス等で構成し、表面層の記録材
通過領域に金属クロムメッキを施こし、ローラ自体とし
ては高抵抗で、表面層を抵抗化したローラを使用する。Further, in the above embodiment, a heat fixing device was explained as an example of a fixing device, but the present invention can also be applied to a pressure fixing device. In this case, for example, the intermediate layer has structural strength and high resistance. The recording material passing area of the surface layer is plated with metal chrome, and the roller itself has a high resistance, and the surface layer is made resistive.
尚、この場合においても、前述のような抵抗値を満足さ
せるようにすればよい。In this case as well, the resistance value as described above may be satisfied.
〔発明の効果〕
以上説明したように、本発明によれば、ローラの表面層
を低抵抗化し、かつその表面層を電気的に浮かすことに
より、オフセットの少ない定着装置が得られた。さらに
、本発明を前述のような小型化された画像形成装置の定
着装置に適用した場合には、画像の転写抜けを防止する
ことができた。[Effects of the Invention] As described above, according to the present invention, a fixing device with less offset can be obtained by lowering the resistance of the surface layer of the roller and electrically floating the surface layer. Further, when the present invention is applied to a fixing device of a miniaturized image forming apparatus as described above, it is possible to prevent image transfer failure.
第１図は本発明の実施例を示す一対のローラの断面図で
ある。
第２図は本発明定着装置を用いた画像形成装置の一例を
示す概略断面図である。
第３図は定着ローラの抵抗に対する画像濃度の実験例を
示すグラフである。
第４図は定着ローラの表面層の抵抗に対するオフセット
量の実験例を示すグラフである。
第５図及び第６図は本発明の他の実２を例を示す定着ロ
ーラの断面図である。
ｉ −−−−−−−−−−−一定着ローラ２ −−−
一一−−−−−−−加圧ローラ４−−−−−−−−−−
−一記録材
１１．１１’−−一表面層
１２．１２’−−一中間層
１３ ’−−−−−−−−−基材
Ｔ −−−−−−−−−−−一未定着トナー像萬３０
もＬＡ図FIG. 1 is a sectional view of a pair of rollers showing an embodiment of the present invention. FIG. 2 is a schematic sectional view showing an example of an image forming apparatus using the fixing device of the present invention. FIG. 3 is a graph showing an experimental example of image density versus resistance of the fixing roller. FIG. 4 is a graph showing an experimental example of the offset amount with respect to the resistance of the surface layer of the fixing roller. FIGS. 5 and 6 are cross-sectional views of a fixing roller showing another example of the present invention. i ---------- Fixed fixing roller 2 ----
11---------Pressure roller 4------------
-1 recording material 11.11'--1 surface layer 12.12'--1 intermediate layer 13'--Base material T--1 unfixed Toner image 30 also LA figure
Claims (5)
の一対のローラ間に未定着像を有する記録材を通過させ
ることにより、記録材上に未定着像を定着する定着装置
において、前記一対のローラのうちの少なくとも一方の
ローラは、基材と、表面層と、その基材と表面層との間
に設けられた中間層とを有し、前記中間層の体積抵抗値
が１０＾１＾０Ω・ｃｍより大きく、且つ前記表面層の
体積抵抗値が１０＾１＾０Ω・ｃｍ以下であって、前記
表面層は電気的にフロート状態とされていることを特徴
とする定着装置。(1) A fixing device that has a pair of rollers that rotate in pressure contact with each other, and fixes the unfixed image on the recording material by passing the recording material having the unfixed image between the pair of rollers. At least one of the pair of rollers has a base material, a surface layer, and an intermediate layer provided between the base material and the surface layer, and the volume resistivity of the intermediate layer is 10^. A fixing device characterized in that the volume resistivity of the surface layer is greater than 1^0 Ω·cm and equal to or less than 10^1^0 Ω·cm, and the surface layer is in an electrically floating state.
ある特許請求の範囲第（１）項に記載の定着装置。(2) The fixing device according to claim 1, wherein the intermediate layer is an adhesive layer between the base material and the surface layer.
ューブ状で形成されたものである特許請求の範囲第（１
）項に記載の定着装置。(3) At least one of the intermediate layer and the surface layer is formed in a tube shape.
) The fixing device described in item 2.
請求の範囲第（１）項乃至第（３）項に記載の定着装置
。(4) The fixing device according to any one of claims (1) to (3), wherein the surface layer is formed of a fluororesin.
ラは加熱手段によって加熱されている特許請求の範囲第
（１）項乃至第（４）項に記載の定着装置。(5) The fixing device according to any one of claims (1) to (4), wherein at least one of the pair of rollers is heated by a heating means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62025396A JPH0830925B2 (en) | 1987-02-04 | 1987-02-04 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62025396A JPH0830925B2 (en) | 1987-02-04 | 1987-02-04 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63192070A true JPS63192070A (en) | 1988-08-09 |
| JPH0830925B2 JPH0830925B2 (en) | 1996-03-27 |
Family
ID=12164732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62025396A Expired - Lifetime JPH0830925B2 (en) | 1987-02-04 | 1987-02-04 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0830925B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02213886A (en) * | 1989-02-15 | 1990-08-24 | Canon Inc | Fixing roll |
| EP0469629A2 (en) * | 1990-08-03 | 1992-02-05 | Canon Kabushiki Kaisha | Elastic roller and fixing apparatus using same |
| JPH0580650A (en) * | 1991-09-24 | 1993-04-02 | Tokai Rubber Ind Ltd | Composite roll |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5883878A (en) * | 1981-11-14 | 1983-05-19 | Daikin Ind Ltd | Nonstick conductive elastic roll |
| JPS58158670A (en) * | 1982-03-15 | 1983-09-20 | Tokyo Silicone Kk | Fixing roll of copying machine |
| JPS58209769A (en) * | 1982-05-31 | 1983-12-06 | Minolta Camera Co Ltd | Heat roll fixation device |
| JPS60133470U (en) * | 1984-02-15 | 1985-09-05 | 株式会社 潤工社 | Roller fixing device |
-
1987
- 1987-02-04 JP JP62025396A patent/JPH0830925B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5883878A (en) * | 1981-11-14 | 1983-05-19 | Daikin Ind Ltd | Nonstick conductive elastic roll |
| JPS58158670A (en) * | 1982-03-15 | 1983-09-20 | Tokyo Silicone Kk | Fixing roll of copying machine |
| JPS58209769A (en) * | 1982-05-31 | 1983-12-06 | Minolta Camera Co Ltd | Heat roll fixation device |
| JPS60133470U (en) * | 1984-02-15 | 1985-09-05 | 株式会社 潤工社 | Roller fixing device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02213886A (en) * | 1989-02-15 | 1990-08-24 | Canon Inc | Fixing roll |
| EP0469629A2 (en) * | 1990-08-03 | 1992-02-05 | Canon Kabushiki Kaisha | Elastic roller and fixing apparatus using same |
| US5420679A (en) * | 1990-08-03 | 1995-05-30 | Canon Kabushiki Kaisha | Elastic roller and fixing apparatus using same |
| JPH0580650A (en) * | 1991-09-24 | 1993-04-02 | Tokai Rubber Ind Ltd | Composite roll |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0830925B2 (en) | 1996-03-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |