JPH09160395A - Image forming device - Google Patents

Image forming device

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Publication number
JPH09160395A
JPH09160395A JP32266795A JP32266795A JPH09160395A JP H09160395 A JPH09160395 A JP H09160395A JP 32266795 A JP32266795 A JP 32266795A JP 32266795 A JP32266795 A JP 32266795A JP H09160395 A JPH09160395 A JP H09160395A
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Prior art keywords
transfer
resistance
primary transfer
secondary transfer
conductive layer
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JP32266795A
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JP3301474B2 (en )
Inventor
Toshiya Takahata
Toshihiko Yamazaki
敏彦 山▲崎▼
俊哉 高畑
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Seiko Epson Corp
セイコーエプソン株式会社
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Abstract

PROBLEM TO BE SOLVED: To obtain an image forming device capable of executing the operation of primary transfer simultaneously with the operation of secondary transfer, making transfer operation short and provided with a compact power source by making a resistance from a primary transfer bias impressing power source to a conductive layer and the apparent resistance of a primary transfer part have specified relation.
SOLUTION: A resistance R1 is the apparent resistance of the primary transfer part, and a resistance RT is the resistance from the power source to the conductive layer and is mainly a contact resistance between the conductive layer and a contact electrode. It is desirable that they have relation RT<R1, and further RT/R1<0.1. In the case the primary transfer and the secondary transfer are simultaneously performed, a secondary transfer bias impressing power source V2 controlled so that a constant current I2 may be flow is connected to the conductive layer A of an intermediate transfer medium through the secondary transfer part. By subtracting the output voltage of the power source V2 from the potential of the point of the conductive layer A and deviding it by the constant current I2 flowing in the secondary transfer part, the apparent resistance R2 of the secondary transfer part is calculated. Since the secondary transfer part performs constant-current control, transfer efficiency is fixed even in the case of performing simultaneous printing.
COPYRIGHT: (C)1997,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、感光体等の潜像担持体に形成された潜像を、順次、色の異なるカラートナーにより現像し、現像されたトナー像を一旦中間転写媒体に転写し、全色のトナー像を中間転写媒体上に重ね合わせた後まとめて記録紙に転写する画像形成装置に関する。 BACKGROUND OF THE INVENTION The present invention transfers the latent image latent image formed on the carrier such as a photoconductor, sequentially developed with different color color toner, the developed toner image temporarily on the intermediate transfer medium and an image forming apparatus which transfers to collectively recording sheet after superposing toner images of all colors on the intermediate transfer medium.

【0002】 [0002]

【従来の技術】カラーレーザープリンター、カラー複写機として使用される画像形成装置のひとつとして、感光体に形成された潜像を、順次、色の異なるカラートナーにより現像し、現像されたトナー像を一旦中間転写媒体に転写し、全色のトナー像を中間転写媒体上に重ね合わせた後、まとめて記録紙に転写する中間転写方式がある。 BACKGROUND ART color laser printer as one of the image forming apparatus to be used as a color copying machine, a latent image formed on the photosensitive member, successively developed with different color color toner, the developed toner image once transferred to an intermediate transfer medium, after superposing toner images of all colors on the intermediate transfer medium, there is an intermediate transfer method for transferring to collectively recording paper. 一般的に、トナーを静電的に転写する方式が用いられている。 In general, a method of transferring the toner electrostatically is used. この静電的に転写する中間転写方式において、中間転写媒体が電気的に均一な抵抗体で形成されるものや中間転写媒体中に導電体が導電層を有し更に表面層として抵抗層が形成されているもの等種々の構成が提案されている。 In the intermediate transfer method of transferring this electrostatically, resistive layer formed as an intermediate transfer medium further surface layer has conductor a conductive layer in those or an intermediate transfer medium formed of an electrically uniform resistor various configurations such as that has been proposed.

【0003】さて電気的に均一な抵抗体で形成される中間転写媒体を有する画像形成装置においては、一般的に転写電界は転写部裏面に当接する導電性のローラにより付与されるが、中間転写媒体に歪み等が発生したり導電性のローラにごみが付着した場合、部分的に電界が付与できなくなり転写部の電界が不均一となり転写された画像にむらが発生する。 [0003] Now the image forming apparatus having an intermediate transfer medium formed of an electrically uniform resistor is generally transfer electric field is applied by a conductive roller in contact with the transfer unit back surface, the intermediate transfer If distortion at medium is attached dust on a conductive roller or generated, partially field will transfer portion can not be an electric field is applied is uneven transferred image becomes nonuniform occurs. 一方導電層を有する中間転写媒体から構成される画像形成装置は、中間転写媒体に歪みが発生したり、転写部のローラーにごみが付着した場合にも、転写部全域に均一な転写の電界が付与できるため、 On the other hand the image forming apparatus composed of an intermediate transfer medium having a conductive layer, or distortion occurs in the intermediate transfer medium, even when the dust adheres to the roller of the transfer unit, an electric field of uniform transferred to the transfer section entire order can be granted,
転写に起因する画像むらが無くなるという長所を有する。 Image unevenness due to the transfer has the advantage that is eliminated.

【0004】しかしながら導電層を有する中間転写媒体から構成される画像形成装置では、一次転写の動作のみ行う時に最適に設定された一次転写部に流れる電流が、 [0004] However, in the image forming apparatus including an intermediate transfer medium having a conductive layer, the current flowing through the primary transfer portion which is optimally set at the time of performing only the operation of the primary transfer,
一次転写と二次転写の動作を同時に行った時に回路に二次転写部の電流が流入し変化してしまうため、一次転写部の転写効率が変化し良好な画像が形成できないという欠点があった。 Since thus the current of the secondary transfer portion flows changes in the circuit when subjected to primary transfer and secondary transfer operations simultaneously, has a drawback that the transfer efficiency of the primary transfer portion can not be formed a good image change .

【0005】これを防ぐため従来一次転写と二次転写の動作を同時に行なわないという対策がとられている。 [0005] Measures are taken that no concurrently performed operations of a primary transfer and secondary transfer order to prevent this. 例えば、特開平1−288877号公報では、中間転写媒体のトナー像を形成する表面と反対側に導電層が形成されており、相互の動作を同時に行わないで、一次転写二次転写それぞれの動作時に、電極の電位状態を非接地、 For example, Japanese Laid-1-288877 discloses a surface for forming a toner image on the intermediate transfer medium and a conductive layer is formed on the opposite side, without performing mutual operations simultaneously, the primary transfer secondary transfer each operation sometimes, non-ground the potential state of the electrode,
地接地と切り替えている。 It is switched to the earth ground.

【0006】 [0006]

【発明が解決しようとする課題】しかし、上述の従来技術においては、一次転写と二次転写の動作が同時に行われないようにするために、一次転写部から二次転写部までの中間転写媒体の長さを記録紙の搬送方向の長さより長くしたり、あるいは一次転写が完全に終了するまで二次転写動作を行わず、一次転写終了以前に二次転写部を通過してしまった画像先端部を再度二次転写部まで搬送するための空回しを行ってから二次転写を開始する必要があった。 [SUMMARY OF THE INVENTION However, in the prior art described above, in order to be the primary transfer and secondary transfer operations are not performed simultaneously, the intermediate transfer medium from the primary transfer unit to the secondary transfer portion of or longer than the length of the length in the conveying direction of the recording sheet, or without secondary transfer operation to the primary transfer is completely finished, the image tip having passed through the secondary transfer unit to the primary transfer before the end part was necessary to start the secondary transfer after performing the idling for conveying again to the secondary transfer portion. この結果中間転写媒体が大型化したり、転写動作に長い時間を必要とする問題点を有していた。 The result or intermediate transfer medium is large, there is a problem that requires a long time to transfer operation.

【0007】さらに従来技術の装置構成においては、導電層とそれにバイアス印加するために導電層に接触する接触電極との間に遊離トナー等のごみが蓄積され、導電層と接触電極の抵抗値が大きくなり良好な転写が継続できなくなるという問題点を有していた。 [0007] In yet prior art device configuration, dust free toner or the like between the contact electrode in contact with the conductive layer in order to bias the conductive layer and it is accumulated, the resistance value of the conductive layer and the contact electrode increases and there is a problem in that good transfer can not be continued.

【0008】そこで本発明は、かかる問題点を解決するためになされたものであり、その目的とするところは、 [0008] The present invention has been made to solve the above problems, and an object,
一次転写、二次転写の動作が同時に実行でき、転写動作が短く小型の電源を有する画像形成装置を提供することにある。 Primary transfer, can perform the operation of the secondary transfer simultaneously to provide an image forming apparatus having a small power supply short transfer operation. また本発明の第二の目的は、使用にともなう接触抵抗の変化を防ぎ、良好な転写動作を継続的に得ることにある。 The second object of the present invention is to prevent a change in the contact resistance due to use, it is to obtain a good transfer operation continuously.

【0009】 [0009]

【課題を解決するための手段】本発明の画像形成装置は、順次色の異なるカラートナーにより現像されたトナー像を中間転写媒体に転写する一次転写部と、一次転写部においてバイアスを印加するための一次転写バイアス印加電源と、前記全色中間転写媒体にて重ね合わせられた全色カラートナー像を記録紙に転写する二次転写部と、二次転写部においてバイアスを印加するための二次転写バイアス印加電源を有する画像形成装置において、 The image forming apparatus of the present invention SUMMARY OF THE INVENTION comprises a first transfer unit for transferring the toner image developed by the different color toners sequentially color the intermediate transfer medium, for applying a bias in the primary transfer section a primary transfer bias application power source of the secondary transfer unit for transferring the recording paper all colors color toner images superimposed in all color intermediate transfer medium, a secondary for applying a bias in the secondary transfer portion in the image forming apparatus having a transfer bias application power source,
前記中間転写媒体が導電層を有し、かつ、前記一次転写バイアス印加電源から前記導電層までの抵抗RTと一次転写部の見かけの抵抗R1が、 RT<R1 なる関係を有することを特徴とする。 Wherein a intermediate transfer medium to the conductive layer, and the resistance R1 of the apparent resistance RT and the primary transfer portion from the primary transfer bias application power source to said conductive layer, and having a RT <R1 the relationship .

【0010】さらに RT/R1≦0.1 なる関係を有することを特徴とする。 [0010] further characterized as having a RT / R1 ≦ 0.1 the relationship.

【0011】 [0011]

【発明の実施の形態】以下に本発明の実施の形態を図面に基づいて説明する。 It will be described with reference MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention with reference to the drawings.

【0012】図1は本発明の画像形成装置の断面概観図である。 [0012] Figure 1 is a sectional schematic view of an image forming apparatus of the present invention. まず、装置の動作を説明する。 First, the operation of the device. 帯電ローラ10 Charging roller 10
2は感光体101を均一にある電位(例えば−700 2 is uniform photoreceptor 101 potential (eg -700
V)に帯電する。 Charged to V). レーザー走査光学系である露光手段1 Exposure means 1 is a laser scanning optical system
03によって形成された600dpi(dot per 600dpi formed by 03 (dot per
inch)の解像度のレーザービームは折り返しミラー104により感光体101上に導かれ静電潜像(例えば−100V)が形成される。 Laser beam resolution inch) electrostatic latent image is guided onto the photosensitive member 101 by the folding mirror 104 (e.g., -100 V) is formed. 次に図中矢印方向に接離可能な一成分接触方式の現像器105の内、イエロー現像器105Yを接触させ他の現像器は離間させるとともに図では示していない電源の電界作用によって負帯電性イエロートナーが反転現像され感光体上101において顕像化される。 Then among the developing unit 105 of the one-component contact system capable separable in the direction of the arrow in the figure, negatively charged by a power supply to an electric field effect of which are not shown in the drawing with the other developing devices contacting the yellow developing device 105Y is moved away yellow toner is visualized in are on the photosensitive member 101 reversal development. 顕像化されたイエロートナーは、中間転写媒体に静電転写される。 Yellow is visualized toner is electrostatically transferred to the intermediate transfer medium.

【0013】中間転写媒体はPET(ポリエチレンテレフタレート)の基材上に、導電層としてアルミ蒸着膜を有し、さらにその上部を適当な抵抗に調整された表面抵抗層により被覆されている。 [0013] The intermediate transfer medium onto a substrate of PET (polyethylene terephthalate), have an aluminum vapor-deposited film as the conductive layer, are further covered by a surface resistance layer which is adjusted to the upper to the appropriate resistance. 中間転写媒体の表面は、全て表面抵抗層に被覆されておらず、端部において導電層が露出している。 The surface of the intermediate transfer medium is not covered on all surface resistance layer, the conductive layer is exposed at the end.

【0014】定電圧制御可能な一次転写バイアス印加電源108によりトナーと逆極性のバイアスが発生され、 [0014] Bias of toner and opposite polarity is generated by the constant voltage controllable primary transfer bias application power source 108,
電源108に接続された接触電極121から中間転写媒体106の導電層露出部を介し、中間転写媒体106上に転写電圧が印加される。 Through the conductive layer exposed portion of the intermediate transfer medium 106 from the contact electrode 121 connected to a power source 108, a transfer voltage is applied to the intermediate transfer medium 106. 感光体101上のトナーは、 Toner on the photosensitive member 101,
感光体101と一次転写ローラー107に挟み込まれた中間転写媒体106上に静電転写される。 It is electrostatically transferred onto the intermediate transfer medium 106 sandwiched photoreceptor 101 and the primary transfer roller 107. 感光体101 Photoreceptor 101
上の転写残りトナーは、ブレードを接触させてクリーニングする感光体クリーナー109で回収され、続いて感光体電位は除電ランプ110によりリセットされる。 Toner remaining above is collected by the photosensitive member cleaner 109 for cleaning is brought into contact with the blade, followed by photoreceptor potential is reset by the charge removing lamp 110. 同様の動作を中間転写体106の位置と露光手段103の発光タイミングの同期を取りマゼンタ現像器105M、 Similar operations and position of the intermediate transfer body 106 exposing means magenta developing device to synchronize the emission timing of the 103 105M,
シアン現像器105C、ブラック現像器105Kについても繰り返すことにより、中間転写媒体106上に各色のトナーが重ねられフルカラー画像が形成される。 Cyan developing device 105C, by repeated for the black developing device 105K, a full-color image toner of the respective colors are overlapped on the intermediate transfer medium 106 is formed. この間、二次転写ローラ116、および中間転写媒体クーリナー119は離間状態とする。 During this time, the secondary transfer roller 116 and the intermediate transfer medium Kurina 119, is the separated state. 一方、転写材113は給紙カセット112から給紙手段111によりレジストローラ対114まで搬送されたのち、中間転写体106上のフルカラー画像と同期をとって駆動ローラ115と図中矢印方向に接離可能な二次転写ローラ116にて形成される二次転写部に搬送される。 On the other hand, the transfer material 113 after being conveyed from the paper feed cassette 112 by a sheet feeding unit 111 to the registration roller pair 114, separable taking a full-color image and synchronization on the intermediate transfer member 106 in the direction of the arrow in FIG driving roller 115 It is conveyed to the secondary transfer portion formed by possible secondary transfer roller 116. 二次転写部では転写材113と同期して二次転写ローラ116が中間転写体1 In the secondary transfer portion in synchronism with the transfer material 113 secondary transfer roller 116 is an intermediate transfer member 1
06に接触してニップ部を形成するとともに二次転写バイアス印加電源117により定電流制御されその電界の作用で転写材113上にフルカラートナー像が形成される。 06 full-color toner image is formed on the transfer material 113 by a constant current controlled action of the electric field by the secondary transfer bias applying power source 117 to form a nip portion in contact with. また、この時中間転写体媒体クリーナー119は中間転写媒体106に接触する。 At this time the intermediate transfer body medium cleaner 119 contacts the intermediate transfer medium 106. その後、転写材113は定着手段120によって定着され装置外へ排出される。 Thereafter, the transfer material 113 is discharged to the outside is fixed by a fixing means 120 device.
二次転写後の転写残りトナーは図中矢印方向に動くテンションローラ118を通過後、中間転写媒体クリーナー119にて回収される。 Transfer residual after the secondary transfer toner after passing through the tension roller 118 moves in the arrow direction, and is recovered by the intermediate transfer medium cleaner 119.

【0015】本発明では、一次転写部と二次転写部間の中間転写媒体長さが、形成された画像長さより短い場合は、最後の色の画像の一次転写が完全に終了する前に二次転写が同時に行なわれ、この時点では二次転写ローラー116は中間転写媒体に接触している。 [0015] In the present invention, the intermediate transfer medium length between the primary transfer portion and secondary transfer portion is shorter than the image length forming, the double before primary transfer of the last color image is completely finished the following transfer takes place simultaneously in contact secondary transfer roller 116 to the intermediate transfer medium at this point.

【0016】図2〜4に、上記画像形成装置の転写動作に対応した、本発明の簡単な等価回路図を示す。 [0016] Figures 2-4, corresponding to the transfer operation of the image forming apparatus, showing a simple equivalent circuit diagram of the present invention.

【0017】図2は、本発明において、一次転写のみが行われる場合の等価回路図である。 [0017] Figure 2, in the present invention, is an equivalent circuit diagram in the case where only the primary transfer is performed. 一次転写だけが行われる場合は、二次転写ローラーは離間しており等価回路的には二次転写に関わることは考慮しなくともよい。 If only the primary transfer is performed, be involved in the secondary transfer to the equivalent circuit and the secondary transfer roller is separated may not be taken into account. 図中V1は一次転写バイアス印加電源のから発生される定電圧であり、抵抗RTを介し中間転写媒体の導電層Aに印加される。 Figure V1 is a constant voltage generated from the primary transfer bias application power source, it is applied to the conductive layer A of the intermediate transfer medium through a resistor RT. 感光体と導電層の間の一次転写部には一次転写電流I11が流れるが、この場合は電源V1に流れる電流と同じである。 Flows the primary transfer current I11 in the primary transfer portion between the photosensitive member and the conductive layer, this case is the same as the current flowing through the power supply V1. 導電層Aの電位を測定して、前記I The potential of the conductive layer A was measured, the I
11で除することにより一次転写部の見かけの抵抗R1が計算できる。 By dividing the 11 can be calculated resistor R1 apparent primary transfer portion. また抵抗RTは電源から導電層までの抵抗で、主に導電層と接触電極との間の接触抵抗であると考えられるが、一次転写バイアス印加電源V1と導電層A The resistor RT is the resistance from the power supply to the conductive layer mainly are considered to be the contact resistance between the contact electrodes and the conductive layer, a primary transfer bias application power source V1 and the conductive layer A
の電位の差分をI11で除することにより算出できる。 The difference in potential can be calculated by dividing the I11.

【0018】図3は本発明において一次転写、二次転写が同時に行われる場合の等価回路図である。 [0018] Figure 3 is a primary transfer in the present invention, is an equivalent circuit diagram in the case where the secondary transfer are carried out simultaneously. 定電流I2 Constant current I2
が流れるように制御された二次転写バイアス印加電源V The secondary transfer bias application power source V which is controlled to flow
2は、二次転写部を介して中間転写媒体の導電層Aに接続されている。 2 is connected to the conductive layer A of the intermediate transfer medium through the secondary transfer portion. 導電層A点の電位より電源V2の出力電圧を減じ、二次転写部に流れる定電流I2で除することにより二次転写部の見かけの抵抗R2が算出できる。 Subtracting the output voltage of the power supply V2 than the potential of the conductive layer A point can be calculated the resistance of the apparent secondary transfer portion R2 by dividing the constant current I2 flowing through the secondary transfer portion. 二次転写部が接続されたことにより一次転写部に流れる電流は変化しI12となる。 Current flowing through the primary transfer portion by the secondary transfer unit is connected to a changed I12. I12は、I2から一次転写電源に流れる電流を減ずることにより算出できる。 I12 can be calculated by subtracting the current flowing through the primary transfer power from I2.

【0019】図4は、本発明において、二次転写のみが行われる場合の等価回路図である。 [0019] Figure 4, in the present invention, is an equivalent circuit diagram in the case where only the secondary transfer is performed. 一次転写部では、トナーの転写がなくなり、従って見かけの抵抗が非常に大きくなるため一次転写部の回路は考慮しなくともよい。 In the primary transfer portion, there is no transfer of the toner, the circuit of the primary transfer unit for apparent resistance becomes very large therefore may not be considered.

【0020】一次転写と二次転写を同時に行っても良好な画像を得るためには、各転写動作のみが行われる場合と同時に行われる場合、それぞれの転写効率が等しくなれば良い。 In order to obtain a good image even if the primary transfer and the secondary transfer at the same time, if only the transfer operation is carried out simultaneously with when performed, it becomes equal to the respective transfer efficiency. 一般的に転写部を定電流制御を行なうと転写効率が変化せず良好な転写が行われることが知られている。 It is known that generally the transfer unit good without change in the transfer efficiency performs constant current control transferring is performed. 前記本発明の等価回路において二次転写部は定電流制御が可能のため、同時転写行なう場合も、二次転写だけ行なう場合も転写効率は一定である。 For the secondary transfer unit in the equivalent circuit of the present invention can be a constant current control, even if carried out simultaneously transfer, also the transfer efficiency when performing only the secondary transfer is constant. 一方一次転写部へのバイアス印加電源は、転写部に直接電源が接続できないため定電流制御を行えず定電圧制御となる。 Meanwhile bias application power source to the primary transfer portion, the constant voltage control without performing the constant current control for the power supply can not connect directly to the transfer unit. 前記等価回路において一次転写部に流れる電流は、一次転写だけが行われる時と、一次転写二次転写同時に行われる時でそれぞれ下式(1)式(2)であらわされる。 Current flowing through the primary transfer unit in said equivalent circuit is represented by the case where only the primary transfer is performed, the primary transfer secondary transfer simultaneously respectively following formula when performed (1) (2).

【0021】 [0021]

【数1】 [Number 1]

【0022】 [0022]

【数2】 [Number 2]

【0023】各式でRT<R1なる関係を実現すると、I [0023] to achieve at RT <R1 the relationship of each of the formulas, I
11とI12がほぼ同じとなり、一次転写の動作のみ行う場合と、一次転写と二次転写の動作を同時に行う場合の一次転写部における転写効率がほぼ等しくなり、一次転写と二次転写を同時に行うことが可能となる。 11 and I12 are substantially the same, and the performing the case of performing only the operation of the primary transfer, transfer efficiency is almost equal at the primary transfer portion when performing primary transfer and secondary transfer operations simultaneously, the primary transfer and the secondary transfer simultaneously it becomes possible.

【0024】本発明により一次転写と二次転写が同時にできることになり、例えば最大B4縦サイズ以上の画像が形成できる装置の場合、一次転写部と二次転写部間の中間転写媒体長さはA4縦サイズより短くすることができる。 The present invention by will be the primary transfer and secondary transfer can be performed simultaneously, for example up to B4 vertical when the above image can be formed device size, the intermediate transfer medium length between the primary transfer unit and secondary transfer unit A4 it can be made shorter than the vertical size. 従って、中間転写媒体の長さは、従来の構成の画像形成装置より短くなり装置構成は簡単且つ小型となっている。 Therefore, the length of the intermediate transfer medium is shorter becomes the device configuration from the image forming apparatus of the conventional configuration has a simple and compact.

【0025】本発明ではベルトの基材としてPETを使用したが、プラスチックフィルム等の同等の性質を有する材質ならいかなる基材でもよい。 [0025] In the present invention was used PET as the base material of the belt, may be any substrate if the material having equivalent properties such as a plastic film. PET基材とアルミニウム蒸着層の替わりに金属材料の単体の厚膜、例えばニッケル電鋳ベルト等を使用しても良いが、これらの膜は多数の回転に伴う折り曲げにより、金属疲労を引き起こし破断してしまうため、プラスチックフィルムにより張力を支えるのがより望ましい。 Single thick metal material in place of the PET substrate and the aluminum deposited layer, for example, may be used nickel electroformed belt or the like, by folding these film involves a large number of rotation, broken cause metal fatigue for thus, that it supports the tension of a plastic film more desirable. また本発明の構成では中間転写媒体としてベルト状のものを使用したが、金属ドラム等のドラム状の構成に置いても本発明が有効である。 The configuration of the present invention were from a belt-shaped as an intermediate transfer medium, but the present invention is effective even at a drum-like configuration, such as a metal drum. しかし装置構成の点から形状の自由度が高いベルト状のものが望ましい。 But those terms of the configuration of the shape of the high degree of freedom belt shape is desirable.

【0026】(実施例1)以下に前記、本発明の装置構成にて、電源から導電層までの抵抗RT、一次転写部の見かけの抵抗R1を変化させその画像を評価した。 [0026] (Example 1) the following, in the device configuration of the present invention, the resistance RT of the power supply to the conductive layer, the resulting image was evaluated by changing the resistance R1 of the apparent primary transfer portion.

【0027】電源から導電層までの抵抗RTは、その抵抗成分は主として電極と導電層の接触部の接触抵抗に起因している。 The resistor RT from the power supply to the conductive layer, the resistance component is mainly caused by the contact resistance of the contact portion of the electrode and the conductive layer. そこでアルミニウム導電層の不動体膜厚を変化させまた、電極の接触圧を変化させることにより接触抵抗を変化させることにより、RTを変化させた。 Therefore the non-moving object thickness of the aluminum conductive layer is changed also by changing the contact resistance by varying the contact pressure of the electrodes was varied RT.

【0028】一次転写部の見かけ抵抗はR1は、感光体の帯電電位V 0 、中間転写媒体の回転線速であるプロセス速度v、トナー厚みd、画像形成領域の広さl、中間転写媒体のin-situ抵抗R m等により可変である。 [0028] The apparent resistance of the primary transfer portion R1 is charged potential V 0 photoreceptor, a rotational linear velocity of the intermediate transfer medium processing speed v, the toner thickness d, size l of the image forming area, the intermediate transfer medium it is variable by in-situ resistivity R m and the like. これらの要因を変化させることにより、一次転写部の見かけの抵抗R 1を変化させた。 By varying these factors, varying the resistance R 1 of the apparent primary transfer portion.

【0029】評価方法は、画像形成装置にてA4サイズの画像を全面ベタ印字を行い転写紙に印字された像を目視にて評価した。 The evaluation method was evaluated the printed image on the transfer sheet subjected to whole-area solid printing an image of A4 size in the image forming apparatus visually. 本装置においては、一次転写部と二次転写部間の中間転写媒体長さがA4サイズの画像長さより短い。 In the present apparatus, it is shorter than the image length of the A4 size intermediate transfer medium length between the primary transfer unit and the secondary transfer unit. 従って、二次転写が行がまだ始まらないとき一次転写が実行された画像領域が転写紙の先端に、二次転写と同時に行われた一次転写の領域が転写紙の後端に形成される。 Therefore, the secondary transfer to the distal end of the image region in which the primary transfer has been executed transfer sheet when the row is not yet start, concurrently primary transfer regions and the secondary transfer is formed at the rear end of the transfer sheet. 印字した転写紙の先端、後端を目視により比較し、後端が先端と区別できない場合は一次転写、二次転写同時におこなっても良いことが分かる。 Printing the transfer sheet tip, comparing visually the rear end, the rear end tip and can not when the primary transfer distinction, it can be seen that may be performed secondarily transferred simultaneously. 下表1の画像評価の項目に、先端後端が全然区別できない場合は◎、若干濃度差が認められるものの実用上差しつかえない場合は○、はっきり区別できる場合は×と示す。 The item of image evaluation of Table 1, if the tip trailing edge can not be completely distinguished ◎, if slightly may safely practically those density difference is observed ○, if you can clearly distinguish shown as ×.

【0030】上記Rt、R1をそれぞれ変化させた組み合わせにおいて画像を評価した結果を下表1に示す。 [0030] The results of evaluation of the image in combination with varying respectively the Rt, R1 in Table 1 below.

【0031】 [0031]

【表1】 [Table 1]

【0032】前記表1よりRT/ R1を小さくした場合場合は画像先端と、画像後端の区別ができず良好な印字が得られることが判明した。 [0032] and the image tip when when reducing the RT / R1 from Table 1, can not distinguish between the image trailing satisfactory printing could be obtained was found. 従って上記本発明の関係を満たすことにより一次転写二次転写同時転写が可能となる。 Thus it is possible to first transfer the secondary transfer co-transcribed by satisfying the relation of the present invention.

【0033】一般的に接触抵抗は、不動体膜表面に、導電性でかつ酸化しずらい被覆層を広範囲に形成することにより低減できる。 [0033] Generally, the contact resistance, the non-moving object membrane surface, and and oxide conductive can be reduced by widely forming the hesitation coating layer. また電極の接触圧だけを増大させても抵抗値は低減するが、電極が硬い物質だと、導電膜が摩耗してしまうので、耐摩耗性という観点からも被覆層を形成することが望ましい。 Although be increased by the contact pressure of the electrode resistance value decreases, that's the electrodes is hard material, since the conductive film will be worn, it is desirable to form a coating layer from the viewpoint of abrasion resistance. このような被覆層の形成法としては、導電性のカーボンあるいは銀などを分散させた塗料を塗布する方法、また金、銅、ITOなどを、メッキ、真空プロセス等で成膜する方法などが存在する。 The method of forming such a coating layer, a method for applying a conductive carbon or paint etc. allowed to disperse silver, also gold, copper, ITO and the like, plating, and a method of forming a film by a vacuum process or the like is present to.

【0034】(実施例2)前記実施例1では、RTとR1 [0034] (Example 2) Example 1, RT and R1
の関係の具体例を述べてきたが、本実施例2では特に電極部の耐久性を向上させRT/R1を常に小さく保つする方法例について述べる。 The have been described a specific example of a relationship describes a method example for the RT / R1 improve the durability of the second embodiment in particular electrode section always kept small.

【0035】図5に実施例2における中間転写媒体端部の断面図を示す。 [0035] illustrates a cross-sectional view of the intermediate transfer medium position in FIG. 5 in the second embodiment. 中間転写媒体をその進行方向方向に垂直に切った概略図である。 It is a schematic view taken perpendicular to the intermediate transfer medium in the traveling direction of the direction. PETの基材層201上にアルミニウムを蒸着した導電層202を設け、その上部に適当な抵抗値を有する中間転写媒体の表面抵抗層203 The conductive layer 202 with a deposit of aluminum on a PET substrate layer 201 is provided, the surface resistance layer 203 of the intermediate transfer medium having an appropriate resistance value on top
が形成されており、その上に画像が形成される。 There are formed, an image is formed thereon. 導電層202は、導電性被覆層204により被覆されており、 The conductive layer 202 is covered by the conductive coating layer 204,
ブラシで構成される接触電極121に接触し回路を形成している。 Contacting the constituted the contact electrode 121 with a brush to form a circuit. 導電性被覆層204が感光体101に当接するような構成をする場合、感光体表面の材料、遊離トナー、紙粉等の固有抵抗値の大きい物質が導電性被覆層2 When a conductive coating layer 204 is configured as to contact with the photosensitive member 101, the material of the photosensitive member surface, free toner, paper powder specific resistance of a material having a high conductivity coating layer 2
04に強く付着し接触抵抗が大きくなってしまう。 Adhere to the contact resistance is increased strongly to 04. そこで本実施例では、中間転写媒体の表面抵抗層203が導電性被覆層204と接触する端部を、他の領域より厚く形成することにより、導電性被覆層204が感光体10 Therefore, in the present embodiment, the end surface resistance layer 203 of the intermediate transfer medium is contacted with the conductive coating layer 204, by thicker than the other regions, the conductive coating layer 204 is the photoconductor 10
1に直接接触する事を妨げ表面被覆層203の抵抗値を低く保つことができる。 It can be kept 1 low resistance value of things interfere surface coating layer 203 in direct contact with the.

【0036】また導電層がブラシ等の接触電極により直接摺擦され、摩耗により導電層自身の導電性が悪くなることを防ぐために、表面抵抗層と導電性被覆層の隙間を無くすことが望ましく、そのために互いに隣接する端部が重なり合うように形成される場合がある。 Further conductive layers are rubbed directly by contact electrode such as a brush, in order to prevent the conductivity of the conductive layer itself is deteriorated due to wear, it is desirable to eliminate the clearance of the surface resistance layer and the conductive coating layer, it may be formed such that the end overlap the adjacent therefor. このような場合導電性被覆層を形成後、その端部を覆うように表面抵抗層を形成すると、表面抵抗層の導電性被覆層と接触する端部が他の表面抵抗領域より厚く形成でき、導電性被覆層が感光体に直接接触する事を妨げることが可能となり表面被覆層の抵抗値を低く保つことができる。 After forming such a case the conductive coating layer, to form a surface resistance layer so as to cover the end portion, the end portion in contact with the conductive coating layer of the surface resistance layer can be thicker than the other surface resistance region, conductive coating layer can be kept low resistance of the photoreceptor can be prevented from being in direct contact with the with it the surface coating layer. 表面抵抗層に滑材を混入すると、表面抵抗層端部の膜厚が厚い突出部の耐摩耗性が向上し好ましい。 When incorporating lubricant in the surface resistance layer, the thickness of the surface resistance layer end is improved wear resistance of the thick protrusions preferred.

【0037】以上本実施例では接触抵抗が低く保ちつづけることができる。 [0037] As described above, in the present exemplary embodiment can be contact resistance continues maintaining a low. 一次転写バイアス印加電源108から導電層202までの抵抗RTの大部分は接触抵抗に起因しており、従って接触抵抗を小さく保つことによりR R by keeping the primary transfer bias application power source 108 most of the resistance RT to conductive layer 202 is due to the contact resistance, thus reducing the contact resistance
T/R1を常に小さく保つことができる。 It can be a kept always less T / R1. 本実施例の前記構成で、B4サイズ紙8000枚相当の画像を連続して形成したが、画像の劣化、すなわち接触抵抗に起因する画像濃度むらは認められなかった。 In the configuration of this embodiment has formed continuous pictures of substantial 8,000 sheets B4 size paper, image degradation, that is, the image density unevenness due to the contact resistance was observed.

【0038】本実施例では接触電極121としてブラシを用いて説明したが、このほかにローラ状の回転電極、 [0038] In the present embodiment has been described using a brush as the contact electrode 121, but this in addition to the roller-shaped rotary electrodes,
固定型の炭素電極、あるいはブラシが回転するタイプの電極でも接触することにより給電できる電極であればいずれを用いても使用可能である。 Carbon electrodes of the fixed type or a brush can be used by using any as long as electrodes can be supplied by contacting in the electrode of the type that rotates.

【0039】なおシート材料の両端を継ぎ合わせベルト状の中間転写媒体を作成する場合、中間転写媒体上にできた継ぎ目部の表面に一定の幅を有する凹部が生成される。 [0039] In the case of creating an intermediate transfer medium across the seamed belt-shaped sheet material, recesses in the surface of the joint portion can turn on the intermediate transfer medium having a constant width are generated. さらに導電層上に導電性被覆層を形成しその後に継ぎ合わせをする場合は、この継ぎ目部において導電性被覆層が不連続となる。 If the seaming more then forming a conductive coating layer on the conductive layer, the conductive coating layer is discontinuous in the joint portion. このような継ぎ目部をブラシ、ローラ等の接触電極が通過する際、際接触抵抗が変化する。 Such joint portions brushes, when the contact electrode such as rollers passes, the contact resistance upon changes. 一次転写が行われている際に接触抵抗が変化すると転写効率が変化して濃度むらが発生するので、接触抵抗の設置位置を調整し、一次転写が行われているときに中間転写媒体ベルトの継ぎ目部と接触電極が接触することが無いようにすることが望ましい。 Since density unevenness contact resistance and transfer efficiency changes change occurs when the primary transfer is performed, by adjusting the installation position of the contact resistance, the intermediate transfer medium belt when the primary transfer is taking place it is desirable to have no touching contact electrode and the joint portion.

【0040】さらに接触電極が中間転写ベルトの回転周方向に導電性被覆層に対して接触する長さを、中間転写媒体ベルトの継ぎ目部の幅以上に設定することにより、 [0040] The further length of the contact electrode is in contact to the conductive coating layer on the circumferential direction of rotation of the intermediate transfer belt, by setting more than the width of the joint portion of the intermediate transfer medium belt,
一次転写が行われているときに継ぎ目部と接触電極が接触しても接触抵抗の変動を押さえることができ、濃度むらのない画像が得られた。 Even in contact with the contact electrode and the joint portion when the primary transfer is performed can be suppressed variations in contact resistance, without density unevenness image was obtained.

【0041】(実施例3)図6は実施例3における中間転写媒体の断面図である。 [0041] (Embodiment 3) FIG. 6 is a sectional view of the intermediate transfer medium in the third embodiment. 図6では、表面抵抗層203 In Figure 6, the surface resistance layer 203
の端部と導電性被覆層204の端部は、次第に薄くなるように互いに斜めに接触しており、突出している部分はない。 End portions of the conductive coating layer 204 is in contact with the obliquely each other becomes gradually thinner, no portion protrudes. 本実施例では導電性被覆層204の端部が表面抵抗層203の端部の上になっているが、表面抵抗層20 In this embodiment the ends of the conductive coating layer 204 is in the upper end of the surface resistance layer 203, the surface resistance layer 20
3の端部が導電性被覆層204の端部の上になっても良い。 End of the 3 may become over the end of the conductive coating layer 204. 突出している部分がなくなった結果、導電性被覆層204の表面も中間転写媒体クリーナー119のクリーニングブレードを用いクリーニングが可能となり導電性被覆層に付着するごみに起因する接触抵抗の増大を防ぐことができた。 Results portion which projects is gone, is possible to prevent an increase in contact resistance due to dust the surface of the conductive coating layer 204 is also attached to the conductive coating layer enables cleaning using a cleaning blade of an intermediate transfer medium cleaner 119 did it. さらに突出している部分をなくすことにより、突出部が感光体101と強く接触し摩耗する事により発生するごみをなくすことができ、ごみに起因する接触抵抗の増大を防ぐことができた。 By eliminating the portion that projects further, protrusions can eliminate dust caused by the strongly contact wear the photosensitive member 101, it was possible to prevent an increase in contact resistance due to dust.

【0042】(実施例4)図7に実施例4における中間転写媒体端部の断面図を示す。 [0042] illustrates a cross-sectional view of the intermediate transfer medium ends in (Example 4) Example 4 is shown in FIG. 図7においては導電性被覆層204は表面抵抗層203より薄く構成される。 Conductive coating layer 204 in FIG. 7 is thinner composed of surface resistance layer 203. 本実施例においては、導電性被覆層204の厚さを表面抵抗層203の厚さより薄くすることにより、感光体10 In the present embodiment, the thickness of the conductive coating layer 204 by less than the thickness of the surface resistance layer 203, the photoconductor 10
1と導電性被覆層204の非接触が達成でき、接触抵抗はさらに継続的に低く保たれる。 1 and can noncontact achieve conductive coating layer 204, the contact resistance is maintained more continuously low. また感光体101と非接触にできたことで、感光体の絶縁層にピンホール等が存在した場合でも、また摩耗に絶縁層が薄くなった場合でも導電性被覆層から感光体への電流のリークがなくなるという効果も有する。 Also it was able to non-contact with the photosensitive member 101, even if pinholes or the like in the insulating layer of the photosensitive member is present, also of a conductive coating layer even when the insulating layer is thinned to the wear of current to the photoconductor It has the effect that leakage is eliminated.

【0043】本実施例の前記構成で画像を形成し評価した結果、良好な画像が実施例3以上に連続して得られた。 [0043] The configuration result of evaluating an image is formed in the present embodiment, good images were obtained in succession in Example 3 above.

【0044】(実施例5)図8に実施例5における中間転写媒体端部の断面図を示す。 [0044] illustrates a cross-sectional view of the intermediate transfer medium ends in (Example 5) Example 5 is shown in FIG. 図8においては、導電性被覆層204として、表面抵抗層と同じ材料を表面層より薄く被覆する事により、導電性被覆層と同等な接触抵抗を発現することができた。 In Figure 8, the conductive coating layer 204, by covering the same material as the surface resistance layer thinner than the surface layer was able to express the equivalent contact resistance and the conductive coating layer. また同時に感光体101と導電性被覆層204の非接触が達成でき、接触抵抗は継続的に低く保たれる。 The achieved simultaneously contactless photoreceptor 101 and the conductive coating layer 204, the contact resistance is kept continuously low. この構成により中間転写媒体の表面抵抗層と導電被覆層の形成が同時に実行でき製造工程が簡易化できた。 Formation of the surface resistance layer and the conductive coating layer of the intermediate transfer medium could be simplified execution can manufacturing process at the same time by this arrangement.

【0045】本実施例の前記構成で画像を形成し評価した結果、良好な画像が実施例3以上に連続して得られた。 [0045] The configuration result of evaluating an image is formed in the present embodiment, good images were obtained in succession in Example 3 above.

【0046】(実施例6)図9に実施例6における中間転写媒体端部の断面図を示す。 [0046] illustrates a cross-sectional view of the intermediate transfer medium ends in (Example 6) Example 6 is shown in FIG. 図9においては、導電性被覆層204を薄く塗りかつ導電性被覆層の表面に部分的に表面抵抗層203と同じ材料のギャップ形成材20 9, the conductive coating layer 204 a thin coating and conductive gap forming member of the same material as the partially surface resistance layer 203 on the surface of the coating layer 20
6を形成した。 6 was formed. この結果感光体101と導電性被覆層2 As a result the photoconductor 101 and the conductive coating layer 2
04の非接触がさらに確実に達成でき、接触抵抗は継続的に低く保たれる。 04 contactless more reliably achieved in the contact resistance is kept continuously low. 図9においてはギャップ材206が直接、導電層202の上部に形成されているが、導電性被覆層204の上部に設置してもよい。 Gap material 206 is directly in FIG. 9, are formed on top of the conductive layer 202 may be laid on top of the conductive coating layer 204.

【0047】本実施例の前記構成で画像を形成し評価した結果、良好な画像が実施例4以上に連続して得られた。 [0047] The configuration result of evaluating an image is formed in the present embodiment, good images were obtained in succession in Example 4 above.

【0048】(実施例7)図10に実施例実施例7における中間転写媒体端部の断面図を示す。 [0048] illustrates a cross-sectional view of the intermediate transfer medium ends in (Example 7) Example Example 7 in FIG. 10. 本実施例においては、導電性被覆層204の端部を基材層201の端部より中央部側に後退させたことを特徴とする。 In the present embodiment, it is characterized in that the ends of the conductive coating layer 204 is retracted from the end portion of the base layer 201 on the center side. 被覆層を基材端部を完全に被覆するよう形成すると、被覆層が基材の端部面を経て基材の内側面まで回り込む場合がある。 When the coating layer is formed so as to completely cover the base end portion, there is a case where the coating layer from flowing to the inner face of the base through the end face of the substrate. 一般的に中間転写媒体を支持するローラーは、剥離放電を防ぐため、接地されている場合が多い。 Rollers which generally supports the intermediate transfer medium, to prevent separation discharge in many cases is grounded. 裏面との支持ローラーに導電層と同じ電位を付与することも可能であるが、ケース本体との絶縁性を確保しないといけないため装置構成が複雑となり、接地することが望ましい。 It is also possible to impart the same potential as the conductive layer on the support rollers and the rear surface, the device configuration for that I have to ensure insulation between the case body becomes complicated, it is desirable to ground.

【0049】例えば中間転写媒体を支持する支持ローラーが接地されている場合には、基材の内側面まで回り込んだ被覆層が支持ローラと接触すると、導電層から支持ローラーに導通路が形成され、導電層が接地した状態となるので導電層に所定の電位が形成できない。 [0049] For example, when the support rollers for supporting the intermediate transfer medium is grounded, the coating layer wrapping around to the inside surface of the base material is in contact with the support roller, a conductive path is formed from the conductive layer to the support rollers It can not be formed with predetermined potentials to the conductive layer because the conductive layer is in a state of being grounded.

【0050】従って本構成にすると中間転写媒体の内周面へのリークが防止できるので、安定して良好な画像が形成することができる。 [0050] Therefore, since when the present configuration can prevent leakage into the inner peripheral surface of the intermediate transfer medium, it can be stably good image formation.

【0051】(実施例8)図11に実施例5における電極接触部の概念図を示す。 [0051] A conceptual view of the electrode contact portion in Example 5 (Example 8) FIG. 本実施例は接触部を常に清掃できる簡易な機構を実現した。 This embodiment realizes a simple mechanism can always clean the contact portion. 図11は中間転写媒体ベルトを表面からみた概念図であり、図中の矢印の方向に回転していく。 Figure 11 is a conceptual view of the intermediate transfer medium belt from the surface will rotate in the direction of the arrow in FIG. 導電性被覆層204には、凹状部207 The conductive coating layer 204, the concave portion 207
が斜めに形成されており、ブラシ状の接触電極121にたまったトナー等は、回転に伴い凹状部で補集され、中間転写媒体の表面抵抗層203上に移動する。 There is formed obliquely, toner or the like accumulated in the brush-like contact electrode 121 is collecting concave portion with the rotation, to move onto the surface resistance layer 203 of the intermediate transfer medium. 表面層に移動したトナー等は、表層に当接する中間転写媒体クリーナー119のクリーナーブレード(本図では図示せず)によって清掃される。 Toner and the like to move to the surface layer is cleaned by the cleaner blade of the intermediate transfer medium cleaner 119 abutting the surface layer (not shown in the figure). これにより電極部は常に清浄に保たれ、その接触抵抗は一定である。 Thus the electrode unit is constantly maintained clean, its contact resistance is constant. 特に前記実施例3、4、5、6の構成にした場合、導電性被覆層204 Particularly when the configuration of the embodiment 3, 4, 5, 6, conductive coating layer 204
が表面層より薄いため、ブレードクリーニングでは充分表面のトナー等が除去できない。 There thinner than the surface layer, such as toner sufficient surface with blade cleaning can not be removed. 本実施例の構成によれば、導電性被覆層に付着したトナーやごみは、接触電極により回収され、上記実施例と同じメカニズムで回収される。 According to the configuration of the present embodiment, the toner Yagomi attached to the conductive coating layer is collected by the contact electrode, it is recovered by the same mechanism as the above embodiment. 従って凸凹のある表面構造において非常に有効な方法である。 It is a very effective method in the surface structure that is uneven therefore.

【0052】本実施例では凹状部の例を示したが凸でも同様な作用を発現する。 [0052] In the present embodiment has shown an example of a concave portion expressing a similar effect in the convex. これらの凹凸は、表面被覆層にや他の塗料の印刷により形成できる。 These irregularities can be formed by printing of other paint or the surface coating layer. また中間転写媒体のベルトの継ぎ目の段差を利用したり何れの方法で形成しても良い。 The step of the seam of the belt of the intermediate transfer medium may be formed by any of the methods or use of.

【0053】また接触電極としてローラー状のものを使用した場合は、中間転写媒体回転の一定間隔において、 [0053] In the case of using a roller-shaped object as a contact electrode, in regular intervals of the intermediate transfer medium rotates,
ローラーを中間転写媒体表面層と当接させることによりトナー等を表層に転写しクリナーブレードにより回収することもできる。 It can also be recovered by transferring cleaner blade toner or the like on the surface layer by contacting the intermediate transfer medium surface layer of a roller.

【0054】本実施例の前記構成で画像を形成し評価した結果、良好な画像が実施例6以上に連続して得られた。 [0054] The configuration result of evaluating an image is formed in the present embodiment, good images were obtained in succession to the above Example 6.

【0055】なお本実施例においては導電層に導電性被覆層を施してあるが、導電層が充分強度を有し、初期の接触抵抗が小さい場合被覆を施す必要がないことは明らかである。 [0055] Although in the present embodiment are subjected to conductive coating layer on the conductive layer, the conductive layer has a sufficient strength, it is not necessary to apply the case cover initial contact resistance is small is evident.

【0056】 [0056]

【発明の効果】以上説明した本発明の効果を以下に記す。 According to the present invention the effect of the present invention described above are described below.

【0057】本発明の請求項1によれば、二次転写が行がまだ始まらないとき一次転写が実行された画像領域と、二次転写と同時に行われた一次転写の領域で得られる画像は変わらず良好である。 According to claim 1 of the [0057] present invention, the secondary and primary transfer image area line is executed primary transfer when not yet start, the image obtained in the region of the simultaneously performed the primary transfer and secondary transfer unchanged is good. 請求項2を実施するとさらに良好な画像が得られる。 Better image when implementing the claims 2 to obtain.

【0058】従って一次転写、二次転写同時転写が可能となり、転写動作が短く小形の小形の電源を有する画像形成装置を提供することが可能となった。 [0058] Thus the primary transfer, enables the secondary transfer simultaneous transfer, the transfer operation has become possible to provide an image forming apparatus having the power supply of the short compact small.

【0059】また本発明実施例2〜10の構成を実施する事により、中間転写媒体の導電層と、感光体は互いに強く当接しないため、感光体が導電層に付着して導電層の接触抵抗が大きくなったり、逆に感光体の絶縁層を破壊し転写不能となることが起きず、RT/R1が変化せず、一次転写二次転写同時転写が可能な枚数を増加させることが可能となった。 [0059] Further by carrying out the construction of the present invention Examples 2 to 10, and the conductive layer of the intermediate transfer medium, since the photoreceptor does not contact strongly with each other, the contact of the conductive layer photoreceptor adhere to the conductive layer resistance become large, contrary does not occur that destroy the insulating layer of the photosensitive member becomes impossible transcription, RT / R1 is not changed, it is possible to increase the number that can be primary transfer secondary transfer simultaneously transfer It became.

【0060】また本発明の実施例11を構成することにより接触電極部が常に清浄に保たれるため、接触抵抗値、あるいはRT/R1が変化せず一次転写二次転写同時転写が可能な枚数をさらに増加させることが可能となった。 [0060] Further embodiments for the contact electrode part is always kept clean by configuring the example 11, the contact resistance value, or RT / R1 which is capable of primary transcription secondary transfer simultaneous transfer without changing the number of the present invention it becomes possible to further increase the.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の画像形成装置の断面概観図。 FIG. 1 is a cross-sectional schematic view of an image forming apparatus of the present invention.

【図2】一次転写のみが行われる場合の等価回路図。 Figure 2 is an equivalent circuit diagram in the case where only the primary transfer is performed.

【図3】一次転写、二次転写が同時に行われる場合の等価回路図。 [3] the primary transfer, the equivalent circuit diagram in the case where the secondary transfer are carried out simultaneously.

【図4】二次転写のみが行われる場合の等価回路図。 Figure 4 is an equivalent circuit diagram in the case where only the secondary transfer is performed.

【図5】実施例2における中間転写媒体端部の断面図。 Sectional view of an intermediate transfer medium ends in FIG. 5 Example 2.

【図6】実施例3における中間転写媒体端部の断面図。 Sectional view of an intermediate transfer medium position in Figure 6 Example 3.

【図7】実施例4における中間転写媒体端部の断面図。 7 is a cross-sectional view of the intermediate transfer medium position in the fourth embodiment.

【図8】実施例5における中間転写媒体端部の断面図。 Figure 8 is a cross-sectional view of the intermediate transfer medium ends in Example 5.

【図9】実施例6における中間転写媒体端部の断面図。 Figure 9 is a cross-sectional view of the intermediate transfer medium ends in Example 6.

【図10】実施例実施例7における中間転写媒体端部の断面図。 Sectional view of an intermediate transfer medium position in Figure 10 Example Example 7.

【図11】実施例8における電極接触部の概念図。 [Figure 11] schematic diagram of the electrode contact portion in Example 8.

【符号の説明】 DESCRIPTION OF SYMBOLS

101 感光体 102 帯電ローラ 103 露光手段 104 折り返しミラー 105Y イエロー現像器 105M マゼンタ現象器 105C シアン現像器 105K ブラック現像器 106 中間転写媒体 107 一次転写ローラ 108 一次転写バイアス印加電源 109 感光体クリーナー 110 除電ランプ 111 給紙手段 112 給紙カセット 113 転写材 114 レジストローラ対 115 駆動ローラ 116 二次転写ローラ 117 二次転写バイアス印加電源 118 テンションローラ 119 中間転写媒体クリーナー 120 定着手段 121 接触電極 201 基材層 202 導電層 203 表面抵抗層 204 導電性被覆層 206 ギャップ形成材 207 凹状部 101 photoreceptor 102 a charging roller 103 exposing unit 104 folding mirror 105Y yellow developing device 105M magenta phenomenon unit 105C cyan developing device 105K black developing device 106 an intermediate transfer medium 107 primary transfer roller 108 primary transfer bias application power source 109 photoreceptor cleaner 110 removing lamp 111 sheet feeding means 112 the sheet feeding cassette 113 transfer material 114 registration roller pair 115 driven roller 116 secondary transfer roller 117 secondary transfer bias applying power source 118 tension roller 119 intermediate transfer medium cleaner 120 fixing means 121 contact electrodes 201 base layer 202 conductive layer 203 surface resistance layer 204 conductive coating layer 206 gap forming member 207 recess

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 順次色の異なるカラートナーにより現像されたトナー像を中間転写媒体に転写する一次転写部と、一次転写部においてバイアスを印加するための一次転写バイアス印加電源と、前記全色中間転写媒体にて重ね合わせられた全色カラートナー像を記録紙に転写する二次転写部と、二次転写部においてバイアスを印加するための二次転写バイアス印加電源を有する画像形成装置において、前記中間転写媒体が導電層を有し、かつ、前記一次転写バイアス印加電源から前記導電層までの抵抗RTと一次転写部の見かけの抵抗R1が、 RT<R1 なる関係を有することを特徴とする画像形成装置。 And 1. A sequential primary transfer unit that transfers the toner image developed on an intermediate transfer medium by a different color toner color, and the primary transfer bias application power source for applying a bias in the primary transfer portion, the full color intermediate a secondary transfer unit that transfers the entire color color toner images are superimposed at the transfer medium to a recording sheet, an image forming apparatus having a secondary transfer bias application power source for applying a bias in the secondary transfer portion, the image intermediate transfer medium has a conductive layer, and the primary transfer bias application power from the apparent resistance RT and the primary transfer portion to the conductive layer resistor R1, which is characterized by having a RT <R1 the relationship forming apparatus.
  2. 【請求項2】 前記一次転写バイアス印加電源と前記導電層間の抵抗RTと一次転写部の見かけの抵抗R1が、 RT/R1≦0.1 なる関係を有することを特徴とする請求項1記載の画像形成装置。 Wherein said primary transfer bias application power source and the resistance of the apparent resistance RT and the primary transfer portion of the conductive layers R1 is according to claim 1, characterized in that it has a RT / R1 ≦ 0.1 the relationship image forming apparatus.
JP32266795A 1995-12-12 1995-12-12 Image forming apparatus Ceased JP3301474B2 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0919884A2 (en) * 1997-11-28 1999-06-02 Seiko Epson Corporation Image forming apparatus
US6173139B1 (en) 1997-01-31 2001-01-09 Seiko Epson Corporation Recording medium carrier system having a paper feed unit, a transfer unit, a fixing unit and a paper ejecting unit constructed as independent units
US6408158B1 (en) 1997-01-31 2002-06-18 Seiko Epson Corporation Intermediate transfer unit
US6856782B2 (en) 1997-01-31 2005-02-15 Seiko Epson Corporation Intermediate transfer unit having a primary and a secondary transfer member
US7106997B2 (en) * 2002-11-29 2006-09-12 Samsung Electronics Co., Ltd. Intermediate transfer member for carrying intermediate electrophotographic image
EP1835359A2 (en) * 2006-03-17 2007-09-19 Ricoh Company, Ltd. Image forming apparatus having primary and secondary electric bias transferring means
JP2016095435A (en) * 2014-11-17 2016-05-26 シャープ株式会社 Transfer device and image forming apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7187893B2 (en) 1997-01-31 2007-03-06 Seiko Epson Corporation Image transfer unit having an intermediate transfer belt to which a toner image is applied
US6173139B1 (en) 1997-01-31 2001-01-09 Seiko Epson Corporation Recording medium carrier system having a paper feed unit, a transfer unit, a fixing unit and a paper ejecting unit constructed as independent units
US6408158B1 (en) 1997-01-31 2002-06-18 Seiko Epson Corporation Intermediate transfer unit
US6731899B2 (en) 1997-01-31 2004-05-04 Seiko Epson Corporation Intermediate transfer unit
US6856782B2 (en) 1997-01-31 2005-02-15 Seiko Epson Corporation Intermediate transfer unit having a primary and a secondary transfer member
US6957032B2 (en) 1997-01-31 2005-10-18 Seiko Epson Corporation Intermediate transfer unit having a primary transfer member and a secondary transfer roller
EP0919884A3 (en) * 1997-11-28 2000-09-06 Seiko Epson Corporation Image forming apparatus
EP0919884A2 (en) * 1997-11-28 1999-06-02 Seiko Epson Corporation Image forming apparatus
US7106997B2 (en) * 2002-11-29 2006-09-12 Samsung Electronics Co., Ltd. Intermediate transfer member for carrying intermediate electrophotographic image
EP1835359A2 (en) * 2006-03-17 2007-09-19 Ricoh Company, Ltd. Image forming apparatus having primary and secondary electric bias transferring means
EP1835359A3 (en) * 2006-03-17 2007-12-19 Ricoh Company, Ltd. Image forming apparatus having primary and secondary electric bias transferring means
US7546074B2 (en) 2006-03-17 2009-06-09 Ricoh Co., Ltd. Image forming apparatus
JP2016095435A (en) * 2014-11-17 2016-05-26 シャープ株式会社 Transfer device and image forming apparatus

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