JPH0792870A - Method and device for forming image - Google Patents
Method and device for forming imageInfo
- Publication number
- JPH0792870A JPH0792870A JP23600493A JP23600493A JPH0792870A JP H0792870 A JPH0792870 A JP H0792870A JP 23600493 A JP23600493 A JP 23600493A JP 23600493 A JP23600493 A JP 23600493A JP H0792870 A JPH0792870 A JP H0792870A
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- Prior art keywords
- image
- charging
- photoconductor
- developing
- transfer
- Prior art date
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- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、たとえば、電子複写装
置に用いられる画像形成方法および画像形成装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming method and an image forming apparatus used in, for example, an electronic copying apparatus.
【０００２】[0002]
【従来の技術】電子複写装置には長波長域に感度を有す
る感光体を搭載するものがある。この種の電子複写機に
おいて、感光体を帯電する前に除電する際には、長波長
光源による光除電が一般的に用いられ、主にメモリ除去
を目的として露光量が選択されている。2. Description of the Related Art Some electronic copying machines are equipped with a photosensitive member having a sensitivity in a long wavelength region. In this type of electronic copying machine, photo-erasing with a long-wavelength light source is generally used when the charge is eliminated before charging the photoconductor, and the exposure amount is selected mainly for the purpose of memory removal.
【０００３】図８は反転現像システムを示すもので、図
中１は矢印方向に回転する感光体で、感光体１の周囲部
にはその回転方向に沿って除電ランプ２、帯電チャ−ジ
ャ３、現像ロ−ラ４が配設されている。FIG. 8 shows a reversal developing system. In the figure, reference numeral 1 is a photosensitive member which rotates in the direction of the arrow, and a peripheral portion of the photosensitive member 1 is provided with a discharging lamp 2 and a charging charger 3 along the rotating direction thereof. , A developing roller 4 is provided.
【０００４】しかして、画像形成時には、感光体１の表
面が除電ランプ２により除電されたのち、帯電チャ−ジ
ャ３により一様に帯電され、この帯電された感光体１の
表面がレ−ザ露光されて静電潜像が形成される。そし
て、この静電潜像は感光体１の回転により現像ロ−ラ４
へ送られ、この現像ロ−ラ４からトナ−ｔが供給されて
現像され顕像化される。この顕像化された像は図示しな
い転写チャ−ジャにより用紙に転写される。During image formation, however, the surface of the photoconductor 1 is neutralized by the static elimination lamp 2 and then uniformly charged by the charging charger 3, and the charged surface of the photoconductor 1 is lased. It is exposed to form an electrostatic latent image. Then, this electrostatic latent image is developed by the rotation of the photoconductor 1 to the developing roller 4
The toner is supplied from the developing roller 4 to the developing roller 4 for development and visualization. This visualized image is transferred to a sheet by a transfer charger (not shown).
【０００５】ところで、連続画像形成時の感光体２の疲
労にともなう表面電位低下が発生した場合、表面電位〜
現像電位差（以下Ｖ0 〜Ｖb1）が縮まりトナー付着量が
増加する為、白地カブリの原因になる。By the way, when a decrease in surface potential due to fatigue of the photoreceptor 2 during continuous image formation occurs,
The development potential difference (V0 to Vb1) is reduced and the toner adhesion amount is increased, which causes fog on a white background.
【０００６】図９は感光体２の表面電位と白地カブリの
関係を示すもので、感光体２の表面電位が低下するに従
ってカブリが増大する。しかし、従来技術の問題点とし
て、光除電を用いた場合に、露光量と感光体２の疲労履
歴の関係に基づく露光量の設定がなされれていなかった
為、図１０に示すように、感光体１の感光層５と支持体
６の間に高抵抗の樹脂層（以下、ブロッキング層）７を
設け、このブロッキング層７により、感光体疲労時の表
面電位の低下を抑えている。FIG. 9 shows the relationship between the surface potential of the photoconductor 2 and the fog on a white background. The fog increases as the surface potential of the photoconductor 2 decreases. However, as a problem of the conventional technique, when the photo-electrification is used, the exposure amount is not set based on the relationship between the exposure amount and the fatigue history of the photoconductor 2, and therefore, as shown in FIG. A high-resistivity resin layer (hereinafter referred to as a blocking layer) 7 is provided between the photosensitive layer 5 of the body 1 and the support 6, and the blocking layer 7 suppresses a decrease in surface potential when the photoreceptor is fatigued.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、ブロッ
キング層７を設ける方法では感光体２の製造工程数が増
大し、コストアップになるという問題があった。そこ
で、本発明はブロッキング層７を設けることなく、感光
体疲労時の表面電位の低下を抑えることができる安価な
画像形成装置を提供することを目的とする。However, the method of providing the blocking layer 7 has a problem that the number of manufacturing steps of the photoconductor 2 is increased and the cost is increased. Therefore, an object of the present invention is to provide an inexpensive image forming apparatus capable of suppressing a decrease in surface potential when the photoreceptor is fatigued without providing the blocking layer 7.
【０００８】[0008]
【課題を解決するための手段】本発明は上記課題を解決
するため、長波長域に感度を有する感光体を帯電する帯
電工程と、この帯電工程により帯電された感光体の表面
に潜像を形成する像形成工程と、この像形成工程により
形成された潜像に現像剤を供給して現像する現像工程
と、この現像工程により現像された像を被転写材に転写
させる転写工程と、この転写工程による像転写後、前記
帯電工程に先立ち、前記感光体の感度に応じて半減露光
量Ｅ／２×６erg ／cm2 未満の長波長光の除電露光量で
前記感光体を露光する除電工程とを具備してなる。In order to solve the above problems, the present invention provides a charging step of charging a photosensitive member having a sensitivity in a long wavelength region and a latent image on the surface of the photosensitive member charged by this charging step. An image forming step of forming, a developing step of supplying a developer to the latent image formed by the image forming step to develop, a transfer step of transferring the image developed by the developing step to a transfer material, After the image transfer by the transfer step, prior to the charging step, a static elimination step of exposing the photoreceptor with a static elimination exposure amount of a long-wavelength light of less than a half exposure amount E / 2 × 6 ergs / cm 2 according to the sensitivity of the photoreceptor. And.
【０００９】また、長波長域に感度を有する感光体を帯
電する帯電手段と、この帯電手段により帯電された感光
体の表面に電位差による潜像を形成する像形成手段と、
この像形成手段により形成された潜像における電位の低
下した領域に現像剤を供給して反転現像する現像手段
と、この現像手段により現像された像を被転写材に転写
させる転写手段と、この転写手段による像転写後、前記
帯電工程に先立ち、前記感光体の感度に応じて半減露光
量Ｅ／２×６erg ／cm2 未満の長波長光の除電露光量で
前記感光体を露光する除電手段と、を具備してなる。Further, charging means for charging the photosensitive member having a sensitivity in a long wavelength region, and image forming means for forming a latent image due to a potential difference on the surface of the photosensitive member charged by the charging means,
A developing means for supplying a developer to a region in which the potential is lowered in the latent image formed by the image forming means for reversal development, a transfer means for transferring the image developed by the developing means to a transfer material, and After the image is transferred by the transfer means, prior to the charging step, the charge eliminating means for exposing the photoreceptor with a charge eliminating exposure amount of long-wavelength light of less than a half exposure amount E / 2 × 6 ergs / cm 2 according to the sensitivity of the photoreceptor. And.
【００１０】さらに、長波長域に感度を有する感光体を
帯電する帯電手段と、この帯電手段により帯電された感
光体の表面に潜像を形成する像形成手段と、この像形成
手段により形成された潜像に現像剤を供給して現像する
現像手段と、この現像手段により現像された像を被転写
材に転写させる転写手段と、この転写手段による像転写
後、前記帯電工程に先立ち、前記感光体の感度に応じて
半減露光量Ｅ／２×６erg ／cm2 未満の長波長光の除電
露光量で前記感光体を露光する除電手段とを具備してな
る。Further, a charging means for charging the photosensitive member having a sensitivity in a long wavelength region, an image forming means for forming a latent image on the surface of the photosensitive member charged by the charging means, and the image forming means are formed. Developing means for supplying a developer to the latent image to develop the latent image, transfer means for transferring the image developed by the developing means to a transfer material, and after the image transfer by the transferring means, prior to the charging step, And a charge-removing means for exposing the photoconductor at a charge-removing exposure amount of a long-wavelength light of less than a half exposure amount E / 2 × 6 ergs / cm 2 according to the sensitivity of the photoconductor.
【００１１】[0011]
【作用】感光体の帯電工程に先立ち、感光体の感度に応
じて半減露光量Ｅ／２×６erg／cm2 未満の除電露光量
で前記感光体を露光することにより、感光体特性の安定
化を図り、安定した画像を提供すること可能とする。[Function] Before the charging step of the photosensitive member, the characteristics of the photosensitive member are stabilized by exposing the photosensitive member with a static elimination exposure amount of less than E / 2 × 6 erg / cm 2 depending on the sensitivity of the photosensitive member. It is possible to provide a stable image.
【００１２】[0012]
【実施例】以下、本発明を図に示す一実施例を参照して
詳述する。図１は本発明の方法を適応した画像形成装置
の電子写真プロセスユニットの概略構成を示すものであ
る。The present invention will be described in detail below with reference to an embodiment shown in the drawings. FIG. 1 shows a schematic configuration of an electrophotographic process unit of an image forming apparatus to which the method of the present invention is applied.
【００１３】図中１は感光体１１で、この感光体１１は
導電性支持体、光導電性層及び絶縁層を基本構成とし有
しているもので、矢印ａで示す方向に回転するようにな
っている。上記感光体１１の周囲部には、その回転方向
に沿って順次、感光体１１の表面を一様に帯電するため
の帯電装置１２、感光体１１の表面に形成された静電潜
像をトナーとキャリアからなる二成分現像剤を用いて現
像する現像装置１３、感光体１１上に現像された像を紙
上に転写し剥離する転写、剥離装置１４ａ，１４ｂ、転
写後に感光体１の表面上に残存するトナーを除去する現
像剤除去手段としてのドラムクリーナ装置１５および除
電装置２２が配置されている。これにより、電子写真プ
ロセスユニットが構成されている。In FIG. 1, reference numeral 1 denotes a photoconductor 11, which has a conductive support, a photoconductive layer, and an insulating layer as basic components, and is designed to rotate in a direction indicated by an arrow a. Has become. In the peripheral portion of the photoconductor 11, a charging device 12 for uniformly charging the surface of the photoconductor 11 in order along the rotation direction thereof, and an electrostatic latent image formed on the surface of the photoconductor 11 by toner. A developing device 13 for developing using a two-component developer consisting of a carrier and a carrier, transfer and peeling devices 14a, 14b for transferring and peeling an image developed on the photoreceptor 11 onto paper, and on the surface of the photoreceptor 1 after transfer. A drum cleaner device 15 and a static eliminator 22 as a developer removing means for removing the remaining toner are arranged. This constitutes an electrophotographic process unit.
【００１４】また、上記感光体１１の下部側には用紙搬
送路１６が設けられ、この用紙搬送路１６用紙の搬送方
向に沿ってレジストロ−ラ１７、ガイド１８、上記転
写、剥離装置１４、および搬送ベルト２０が配設されて
いる。A sheet conveying path 16 is provided on the lower side of the photoconductor 11, and the register roller 17, the guide 18, the transfer and peeling device 14, and the sheet conveying path 16 are provided along the sheet conveying direction. A conveyor belt 20 is provided.
【００１５】さらに、上記感光体１１の上部側には静電
潜像を形成するための像形成手段としてのレ−ザ露光系
２１が設けられている。しかして、画像形成時には、帯
電装置１２の動作により、感光体１１の表面電位が一様
に帯電される。この帯電後、画像情報に基づきレ−ザ露
光系２１の図示を省略したレーザ発振器から発振され、
同じく図示していない変調器への入力信号に従って変調
された後、回転多面鏡（ポリゴンミラー）（図示せず）
によって走査され結像レンズ（図示せず）を介して感光
体１１の表面にレーザビ−ム２３が照射される。この結
果レーザビーム２３が照射された感光体１１の表面電位
が光減衰し、静電潜像が形成される。Further, a laser exposure system 21 as an image forming means for forming an electrostatic latent image is provided on the upper side of the photoconductor 11. Thus, at the time of image formation, the surface potential of the photoconductor 11 is uniformly charged by the operation of the charging device 12. After this charging, the laser exposure system 21 is oscillated by a laser oscillator (not shown) based on image information,
Similarly, after being modulated according to an input signal to a modulator (not shown), a rotary polygon mirror (polygon mirror) (not shown)
The laser beam 23 is irradiated onto the surface of the photoconductor 11 through a focusing lens (not shown). As a result, the surface potential of the photoconductor 11 irradiated with the laser beam 23 is optically attenuated and an electrostatic latent image is formed.
【００１６】一方、現像装置１３内の現像ローラ２４に
は一定のバイアス電圧が印加されており、静電潜像を担
持した感光体１１が現像ローラ２４と接触すると感光体
１１と現像ローラ２４との間の電位差により、現像ロー
ラ２４上に磁力で付着しているトナーが感光体１１の表
面のレーザ照射部分に付着する。この結果、感光体１１
の表面の静電潜像が可視化（反転現像）される。この
後、感光体１１表面上のトナー像は転写、剥離装置１４
ａ，１４ｂ間に搬送されてきた用紙（図示せず）上に転
写されたのち剥離され、この用紙は定着装置（図示せ
ず）に送り込まれてトナー像の定着処理が行なわれる。On the other hand, a constant bias voltage is applied to the developing roller 24 in the developing device 13, and when the photoconductor 11 carrying the electrostatic latent image comes into contact with the developing roller 24, the photoconductor 11 and the developing roller 24 are separated from each other. Due to the potential difference between the two, the toner adhered to the developing roller 24 by the magnetic force adheres to the laser-irradiated portion on the surface of the photoconductor 11. As a result, the photoconductor 11
The electrostatic latent image on the surface of is visualized (reverse development). After that, the toner image on the surface of the photoconductor 11 is transferred and separated by the peeling device 14
After being transferred onto a sheet (not shown) conveyed between a and 14b, the sheet is peeled off, and this sheet is sent to a fixing device (not shown) to fix the toner image.
【００１７】一方、感光体１１表面上に残留したトナー
像はドラムクリーナ装置１５によって感光体１１の表面
から分離される。その後、感光体１１の表面の静電潜像
は除電装置２２により除電され、再び帯電装置１２によ
り再帯電が行なわれる。On the other hand, the toner image remaining on the surface of the photoconductor 11 is separated from the surface of the photoconductor 11 by the drum cleaner device 15. After that, the electrostatic latent image on the surface of the photoconductor 11 is discharged by the charge removing device 22, and is recharged by the charging device 12 again.
【００１８】ところで、上記除電装置２２は図２に示す
ように、長波長域に発光強度のピークを有する光を感光
体１２に照射する。また、図３に示すように、長波長域
に感度を有する様な感光体を搭載した反転現像システム
において、前述したような光除電機構を用いた場合、露
光による静電潜像パターンを確実に消去する為に必要な
最低露光量以上の露光を与える必要がある。By the way, as shown in FIG. 2, the static eliminator 22 irradiates the photoconductor 12 with light having a peak of emission intensity in a long wavelength region. Further, as shown in FIG. 3, in the reversal development system in which the photosensitive member having the sensitivity in the long wavelength region is mounted, when the above-mentioned photo-electrification mechanism is used, the electrostatic latent image pattern due to the exposure is surely obtained. It is necessary to give more than the minimum exposure amount required for erasing.
【００１９】本発明では光除電を用いた場合の除電露光
量と感光体疲労履歴の関係を明確にし、除電露光量の上
限を規定する事により反転現像システム中でコストアッ
プなく安定した画像を提供する事を目的とする。In the present invention, a stable image is provided in the reversal developing system without increasing the cost by clarifying the relationship between the static elimination exposure amount and the photoconductor fatigue history when using photo static elimination and defining the upper limit of the static elimination exposure amount. The purpose is to do.
【００２０】図４は除電露光量と感光体表面電位（帯電
位置）の関係を示し、光除電を通過し、再帯電突入時の
表面電位とする。図５は除電露光量と感光体表面電位低
下（現像位置）の関係を示し、プリント時間ごとの表面
電位低下量を、各除電露光量別にプロットしたものであ
る。FIG. 4 shows the relationship between the amount of exposure for static elimination and the surface potential (charging position) of the photoconductor, which is the surface potential at the time of recharge inrush after passing through the photostatic charge. FIG. 5 shows the relationship between the static elimination exposure amount and the photoreceptor surface potential reduction (developing position), and the surface potential reduction amount for each printing time is plotted for each static elimination exposure amount.
【００２１】図５より表面電位低下の様な感光体疲労履
歴に対して除電露光量が寄与している事は明確であり、
本データでは１３erg ／cm2 未満で表面電位低下量の減
少が顕著になり光疲労に対して有効な領域となってい
る。From FIG. 5, it is clear that the static elimination exposure amount contributes to the fatigue history of the photoconductor such as a decrease in surface potential.
In this data, when the amount is less than 13 erg / cm 2 , the decrease in the surface potential decrease is remarkable, and it is an effective region against light fatigue.
【００２２】さらに、本実験に使用した感光体１２の半
減露光量（Ｅ／２：初期表面電位×１／２になる時の露
光量）は２．０erg ／cm2 であるため、上記除電装置２
２による除電露光量はおよそＥ／２×６erg ／cm2 未満
に限定されている。Further, since the half-dose exposure amount (E / 2: the exposure amount at the time when the initial surface potential becomes 1/2) of the photoconductor 12 used in this experiment is 2.0 erg / cm 2 , the above static eliminator is used. Two
The static elimination exposure dose of 2 is limited to less than about E / 2 × 6 ergs / cm 2 .
【００２３】このように、除電露光量をＥ／２×６erg
／cm2 未満に限定する事により、感光体疲労履歴にとも
なう表面電位低下を減少させ、安定した画像を提供する
事が可能となった。Thus, the static elimination exposure amount is set to E / 2 × 6 erg
By limiting to less than / cm 2, it became possible to reduce the decrease in surface potential due to the fatigue history of the photoconductor and provide a stable image.
【００２４】なお、図６は除電装置２２により、感光体
１２に対し除電光を照射した状態を示すものである。す
なわち、感光体１２の表面に除電光が照射されると、感
光体の支持体２６に支持される感光層２５の内部に電子
−正孔対が発生し、正孔が表面側に移動し、クリ−ニン
グ後の静電潜像を打ち消す。このとき、過剰な光量を与
えてしまうと、発生した正孔内に、除電に必要とされる
電荷以外の多くが図に示すように感光層２５内にとどま
り、図７に示すように、再帯電時の帯電電荷を打ち消し
てしまう。Incidentally, FIG. 6 shows a state in which the photoconductor 12 is irradiated with static elimination light by the static elimination device 22. That is, when the surface of the photoconductor 12 is irradiated with static elimination light, electron-hole pairs are generated inside the photosensitive layer 25 supported by the support 26 of the photoconductor, and the holes move to the surface side, Cancels the electrostatic latent image after cleaning. At this time, if an excessive amount of light is given, in the generated holes, much of the charges other than the charges required for neutralization remain in the photosensitive layer 25 as shown in the figure, and as shown in FIG. It cancels out the charge that was being charged.
【００２５】また、一定光量以上では、電子−正孔対の
発生が飽和するため変化がないが、一定光量以下では感
光層２５内にとどまる正孔は急激に減少する。したがっ
て、上記したように、除電露光量をＥ／２×６erg ／cm
2 未満に限定する事により、感光体疲労履歴にともなう
表面電位低下を減少させ、安定した画像を提供すること
が可能になる。Above a certain amount of light, there is no change because the generation of electron-hole pairs is saturated, but below a certain amount of light, the number of holes remaining in the photosensitive layer 25 sharply decreases. Therefore, as described above, the static exposure dose is E / 2 × 6 erg / cm 2.
By limiting it to less than 2, it is possible to reduce the decrease in surface potential due to the fatigue history of the photoconductor and provide a stable image.
【００２６】[0026]
【発明の効果】本発明は以上説明したように、感光体に
対しその感度に応じてＥ／２×６erg／cm2 未満の除電
露光量で帯電前の除電を行うから、従来のように、ブロ
ッキング層７を用いることなく、感光体疲労履歴にとも
なう表面電位低下を抑えることができる。したがって、
感光体をコストアップさせずに、安定した画像を提供す
ることができるという効果を奏する。As described above, according to the present invention, since the charge is removed before the charging with the charge-removing exposure amount of less than E / 2 × 6 erg / cm 2 according to the sensitivity of the photoconductor, as in the conventional case, Without using the blocking layer 7, it is possible to suppress the decrease in surface potential due to the history of fatigue of the photoconductor. Therefore,
It is possible to provide a stable image without increasing the cost of the photoconductor.
【図１】本発明の一実施例である画像形成装置の一部を
示す構成図。FIG. 1 is a configuration diagram illustrating a part of an image forming apparatus that is an embodiment of the present invention.
【図２】図１の画像形成装置における除電光源の波長と
光強度の関係を示すグラフ図。FIG. 2 is a graph showing a relationship between wavelength and light intensity of a charge eliminating light source in the image forming apparatus of FIG.
【図３】図１の画像形成装置における感光体の感度特性
を示すグラフ図。FIG. 3 is a graph showing the sensitivity characteristic of a photoconductor in the image forming apparatus of FIG.
【図４】図１の画像形成装置における除電光量と感光体
の表面電位との関係を示すグラフ図。4 is a graph showing the relationship between the amount of static elimination light and the surface potential of the photoconductor in the image forming apparatus of FIG.
【図５】図１の画像形成装置における除電露光量と感光
体の表面電位低下との関係を示すグラフ図。5 is a graph showing the relationship between the amount of static elimination exposure and the decrease in the surface potential of the photoconductor in the image forming apparatus of FIG.
【図６】図１の画像形成装置における感光体に対する除
電光の照射時の感光層内部の状態を示す説明図。FIG. 6 is an explanatory diagram showing a state inside a photosensitive layer at the time of irradiating a photoconductor with static elimination light in the image forming apparatus of FIG.
【図７】図１の画像形成装置における感光体の再帯電時
の感光層内部の状態を示す説明図。FIG. 7 is an explanatory diagram showing a state inside the photosensitive layer when the photoreceptor is recharged in the image forming apparatus of FIG.
【図８】従来の反転現像システムを示す構成図。FIG. 8 is a block diagram showing a conventional reversal developing system.
【図９】図８の感光体の表面電位とカブリとの関係を示
すグラフ図。FIG. 9 is a graph showing the relationship between the surface potential of the photoconductor of FIG. 8 and fog.
【図１０】図８の感光体の構成を示す断面図。FIG. 10 is a cross-sectional view showing the configuration of the photoconductor of FIG.
１１…感光体、１２…帯電装置（帯電手段）、２１…レ
−ザ露光系（像形成手段）、１３…現像装置（現像手
段）、１４ａ…転写装置（転写手段）、２２…除電装置
（除電手段）。11 ... Photoconductor, 12 ... Charging device (charging means), 21 ... Laser exposure system (image forming means), 13 ... Developing device (developing means), 14a ... Transfer device (transfer means), 22 ... Eliminating device ( Static elimination means).
Claims (3)
る帯電工程と、 この帯電工程により帯電された感光体の表面に潜像を形
成する像形成工程と、 この像形成工程により形成された潜像に現像剤を供給し
て現像する現像工程と、 この現像工程により現像された像を被転写材に転写させ
る転写工程と、 この転写工程による像転写後、前記帯電工程に先立ち、
前記感光体の感度に応じて半減露光量Ｅ／２×６erg ／
cm2 未満の長波長光の除電露光量で前記感光体を露光す
る除電工程と、 を具備してなることを特徴とする画像形成方法。1. A charging step of charging a photosensitive member having sensitivity in a long wavelength range, an image forming step of forming a latent image on the surface of the photosensitive member charged by the charging step, and an image forming step formed by this image forming step. A developing step of supplying a developer to the latent image and developing the latent image, a transferring step of transferring the image developed by the developing step to a transfer material, and after the image transfer by the transferring step, prior to the charging step,
A half-exposure amount E / 2 × 6 erg / depending on the sensitivity of the photoconductor
An image forming method comprising a charge removing step of exposing the photoreceptor with a charge removing exposure amount of long wavelength light of less than cm 2 .
る帯電手段と、 この帯電手段により帯電された感光体の表面に電位差に
よる潜像を形成する像形成手段と、 この像形成手段により形成された潜像における電位の低
下した領域に現像剤を付着して反転現像する現像手段
と、 この現像手段により現像された像を被転写材に転写させ
る転写手段と、 この転写手段による像転写後、前記帯電工程に先立ち、
前記感光体の感度に応じて半減露光量Ｅ／２×６erg ／
cm2 未満の長波長光の除電露光量で前記感光体を露光す
る除電手段と、 を具備してなることを特徴とする画像形成装置。2. A charging unit for charging a photosensitive member having sensitivity in a long wavelength region, an image forming unit for forming a latent image due to a potential difference on the surface of the photosensitive member charged by the charging unit, and the image forming unit. Developing means for reversal developing by attaching a developer to a region where the potential is lowered in the formed latent image, transfer means for transferring the image developed by this developing means to a transfer material, and image transfer by this transfer means After that, prior to the charging step,
A half-exposure amount E / 2 × 6 erg / depending on the sensitivity of the photoconductor
An image forming apparatus comprising: a discharging unit that exposes the photosensitive member with a discharging exposure amount of long-wavelength light of less than cm 2 .
る帯電手段と、 この帯電手段により帯電された感光体の表面に潜像を形
成する像形成手段と、この像形成手段により形成された
潜像に現像剤を供給して現像する現像手段と、 この現像手段により現像された像を被転写材に転写させ
る転写手段と、 この転写手段による像転写後、前記帯電工程に先立ち、
前記感光体の感度に応じて半減露光量Ｅ／２×６erg ／
cm2 未満の長波長光の除電露光量で前記感光体を露光す
る除電手段と、 を具備してなることを特徴とする画像形成装置3. A charging means for charging a photoreceptor having sensitivity in a long wavelength range, an image forming means for forming a latent image on the surface of the photoreceptor charged by the charging means, and this image forming means. Developing means for supplying a developer to the latent image to develop the latent image, transfer means for transferring the image developed by the developing means to a transfer material, and after the image transfer by the transferring means, prior to the charging step,
A half-exposure amount E / 2 × 6 erg / depending on the sensitivity of the photoconductor
An image forming apparatus comprising: a discharging unit that exposes the photosensitive member with a discharging exposure amount of long wavelength light of less than cm 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23600493A JPH0792870A (en) | 1993-09-22 | 1993-09-22 | Method and device for forming image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23600493A JPH0792870A (en) | 1993-09-22 | 1993-09-22 | Method and device for forming image |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0792870A true JPH0792870A (en) | 1995-04-07 |
Family
ID=16994370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23600493A Pending JPH0792870A (en) | 1993-09-22 | 1993-09-22 | Method and device for forming image |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0792870A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006208410A (en) * | 2005-01-25 | 2006-08-10 | Ricoh Printing Systems Ltd | Image forming apparatus |
-
1993
- 1993-09-22 JP JP23600493A patent/JPH0792870A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006208410A (en) * | 2005-01-25 | 2006-08-10 | Ricoh Printing Systems Ltd | Image forming apparatus |
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