JPH06324561A - Electrophotography - Google Patents
ElectrophotographyInfo
- Publication number
- JPH06324561A JPH06324561A JP5112700A JP11270093A JPH06324561A JP H06324561 A JPH06324561 A JP H06324561A JP 5112700 A JP5112700 A JP 5112700A JP 11270093 A JP11270093 A JP 11270093A JP H06324561 A JPH06324561 A JP H06324561A
- Authority
- JP
- Japan
- Prior art keywords
- developing
- residual toner
- toner
- roll
- bias voltage
- 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.)
- Withdrawn
Links
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Developing For Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は電子写真方法に係り、特
に転写後に感光体上に残留するトナーを除去するための
クリーニング装置を必要としない電子写真方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic method, and more particularly to an electrophotographic method which does not require a cleaning device for removing toner remaining on a photosensitive member after transfer.
【０００２】[0002]
【従来の技術】電子写真方法において印写プロセスの簡
略化による装置の小型化，装置コストの低減のためにク
リーナを除去する方法が知られている。このクリーナレ
ス電子写真方法は特開昭54−109842号公報に示されるよ
うに記録体上の残留トナーを現像時に現像機に回収しつ
つ現像するものである。2. Description of the Related Art In an electrophotographic method, there is known a method of removing a cleaner in order to downsize the apparatus by reducing the printing process and reduce the cost of the apparatus. In this cleanerless electrophotographic method, as shown in Japanese Patent Laid-Open No. 54-109842, the residual toner on the recording medium is collected while being developed in a developing machine during development.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記従来例で
は、相互に反対の性質である回収と現像とを同時に行う
ため両方を完全に満足させることが困難で、残留トナー
の回収が不十分となり良好な画質を維持出来ないという
欠点を有する。又、記録体の回転毎に現像機での現像と
クリーニングを交互に行うことも知られているが、この
方法では印刷速度が半減するという欠点がある。However, in the above-mentioned conventional example, it is difficult to completely satisfy both of them because recovery and development, which are properties opposite to each other, are performed simultaneously, and recovery of residual toner becomes insufficient. It has a drawback that good image quality cannot be maintained. It is also known that development and cleaning are alternately carried out by a developing machine every time the recording medium is rotated, but this method has a drawback that the printing speed is reduced by half.
【０００４】本発明の目的は、上記事情に鑑み、電子写
真方法においてクリーナを必要とせずに残留トナーを現
像時に効率良く回収する方法を提供することにある。In view of the above circumstances, an object of the present invention is to provide a method for efficiently collecting residual toner during development without the need for a cleaner in an electrophotographic method.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記目的を達
成するために、反転現像方式において現像部を複数設
け、上流側の現像部では残留トナーの回収性を高め（通
常の現像バイアス電圧より、現像バイアス電圧を低く
し）、下流側の現像部では通常の現像性を持たせるよう
にしたものである。In order to achieve the above object, the present invention provides a plurality of developing portions in the reversal developing method, and improves the collectability of residual toner in the upstream developing portion (normal developing bias voltage). Therefore, the developing bias voltage is lowered) so that the developing section on the downstream side has a normal developing property.
【０００６】[0006]
【作用】本発明においては、感光体に対する残留トナー
が完全に現像部にて回収されるので、クリーナレスを必
要とせずに良好な画質を得ることができる。In the present invention, since the residual toner on the photosensitive member is completely collected at the developing section, good image quality can be obtained without the need for cleanerless.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面により説明す
る。図１は、本発明の第１の実施例を示したものであ
る。図において、時計方向に回転する光導電体よりなる
感光体１を帯電器２により一様に例えば正に帯電する。
次に画像情報により変調されたレーザ光線３を照射して
表面電位Ｖ0 ，残留電位Ｖｒのネガ型の静電潜像を形成
する。この静電潜像は現像機４のプラスに帯電したトナ
ー５により反転現像される。感光体１上に出来たトナー
画像６を転写器７により静電的に記録紙８に転写する。
感光体１表面の残留電荷をイレーザ９により消去する。
記録紙８上のトナー画像は定着機１２にて熱的に定着さ
れる。通常の電子写真方法では残留トナー１０は破線で
囲ったクリーナ１１により除去されるが、本発明ではク
リーナ１１を設置せずに、残留トナー１０は感光体１表
面に残留したまま次の印刷プロセスの帯電，露光をへて
現像部へ送られる。現像機４には第１の現像ロール４１
と第２の現像ロール４２があり、第１の現像ロール４１
にはＶｂ1 なる第１のバイアス電圧４１０を第２の現像
ロール４２にはＶｂ2 なる第２のバイアス電圧４２０を
印加する。Ｖｂ1 はＶｂ2 よりも低く設定する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. In the figure, a photoconductor 1 made of a photoconductor rotating clockwise is uniformly charged, for example, positively by a charger 2.
Next, the laser beam 3 modulated by the image information is irradiated to form a negative electrostatic latent image having a surface potential V 0 and a residual potential Vr. The electrostatic latent image is reversely developed by the positively charged toner 5 of the developing device 4. The toner image 6 formed on the photoconductor 1 is electrostatically transferred onto the recording paper 8 by the transfer device 7.
The residual charge on the surface of the photoconductor 1 is erased by the eraser 9.
The toner image on the recording paper 8 is thermally fixed by the fixing device 12. In the usual electrophotographic method, the residual toner 10 is removed by the cleaner 11 surrounded by a broken line. However, in the present invention, the cleaner 11 is not installed, and the residual toner 10 remains on the surface of the photoconductor 1 in the next printing process. After being charged and exposed, it is sent to the development section. The developing machine 4 has a first developing roll 41
And the second developing roll 42, and the first developing roll 41
A first bias voltage 410 of Vb 1 is applied to the second developing roller 42 and a second bias voltage 420 of Vb 2 is applied to the second developing roll 42. Vb 1 is set lower than Vb 2 .
【０００８】図２は表面電位Ｖ0 ，残留電位Ｖｒ，バイ
アス電圧Ｖｂと現像性，残留トナーの回収性を説明する
ものである。横軸は感光体１上の円周方向における位置
を、縦軸は電位の大きさを示す。感光体１には表面電位
Ｖ0 ，残留電位Ｖｒのネガ型の静電潜像を形成する。現
像機４には破線で示したＶ0 とＶｒの中間のＶｂなるバ
イアス電圧を印加する。（Ｖｂ−Ｖｒ）が大きいほど現
像能力は高まる。転写工程後の残留トナー１０はクリー
ナ１１がないためにそのまま帯電器２により感光体１と
一緒に正に帯電される。感光体１の非画像部すなわち表
面電位Ｖ0 の未露光部に付着している残留トナー１０の
みが次の印刷時に画像欠陥として現われる。残留トナー
１０は正に帯電して感光体１に付着しているため現像時
には表面電位Ｖ0 より低いバイアス電圧Ｖｂ側すなわち
現像機４の方向に力をうけ（Ｖ0−Ｖｂ）が大きいほど
現像機４による残留トナー１０の回収能力は高くなる。FIG. 2 illustrates the surface potential V 0 , the residual potential Vr, the bias voltage Vb, the developing property and the residual toner collecting property. The horizontal axis represents the position in the circumferential direction on the photoconductor 1, and the vertical axis represents the magnitude of the potential. A negative electrostatic latent image having a surface potential V 0 and a residual potential Vr is formed on the photoconductor 1. A bias voltage of Vb intermediate between V 0 and Vr indicated by the broken line is applied to the developing device 4. The larger (Vb-Vr), the higher the developing ability. The residual toner 10 after the transfer process is positively charged together with the photoconductor 1 by the charger 2 without the cleaner 11. Only the residual toner 10 attached to the non-image portion of the photoconductor 1, that is, the unexposed portion of the surface potential V 0 appears as an image defect in the next printing. Since the residual toner 10 is positively charged and adheres to the photoconductor 1, the developing force is increased as the bias voltage Vb lower than the surface potential V 0, that is, the direction of the developing device 4 (V 0 −Vb) is increased during development. The ability of the machine 4 to collect the residual toner 10 is increased.
【０００９】Ｖｂ1 なる第１のバイアス電圧４１０をＶ
ｂ2 なる第２のバイアス電圧４２０よりも低く設定する
ことにより残留トナー１０の回収能力は第１の現像ロー
ル４１のほうが第２の現像ロール４２よりも高くなる。
第１の現像ロール４１では十分に残留トナー１０が回収
できるように、又、第２の現像ロール４２では十分な画
像濃度が得られるように現像条件を設定する。例えば、
表面電位Ｖ0 が600Ｖ、残留電位Ｖｒが１００Ｖのとき
第１のバイアス電圧Ｖｂ1 として５０Ｖに、第２のバイ
アス電圧Ｖｂ2として４００Ｖに設定するとよい。この
ときにはＶｂ1はＶｒよりも低いため第１の現像ロール
４１による現像能力はほとんどなく第１の現像ロール４
１はもっぱら残留トナー１０の回収機構としての作用を
なす。このように第１の現像ロール４１をもっぱら残留
トナー１０の回収機構として使用する場合には第１のバ
イアス電圧Ｖｂ1 としては接地電位やマイナスの電位に
することもできる。The first bias voltage 410 of Vb 1 is set to V
By setting the bias voltage to be lower than the second bias voltage 420 that is b 2, the recovery capacity of the residual toner 10 is higher in the first developing roller 41 than in the second developing roller 42.
The developing conditions are set so that the first developing roll 41 can sufficiently collect the residual toner 10 and the second developing roll 42 can obtain a sufficient image density. For example,
When the surface potential V 0 is 600 V and the residual potential Vr is 100 V, the first bias voltage Vb 1 may be set to 50 V and the second bias voltage Vb 2 may be set to 400 V. At this time, since Vb 1 is lower than Vr, there is almost no developing ability by the first developing roll 41 and the first developing roll 4
Reference numeral 1 serves exclusively as a mechanism for collecting the residual toner 10. As described above, when the first developing roll 41 is exclusively used as the mechanism for collecting the residual toner 10, the first bias voltage Vb 1 can be set to the ground potential or a negative potential.
【００１０】図３は、本発明の第２の実施例を示したも
のである。感光体１上の残留トナー１０にたいする機械
的な掻き取り力において現像機４の第１の現像ロール４
１の方が第２の現像ロール４２よりも強くなるように現
像条件を設定するものである。図において第１，第２の
現像ロールの現像ギャップ（現像ロールと感光体との距
離）をＧｐ1，Ｇｐ2とし、第１，第２の現像ロールのド
クタギャップ（現像ロール上の現像剤の厚みを規定する
ためのドクタブレード４５と現像ロールとの距離）をＧ
ｄ1，Ｇｄ2とする。使用する現像剤がトナーとキャリア
よりなる二成分現像剤や一成分磁性トナーの場合には現
像剤を磁力で搬送するために、現像ロールは基本的には
相互に回転可能な磁気ロールとスリーブより構成され
る。第１の磁気ロール４１１，第２の磁気ロール４２１
は円筒状の第１のスリーブ４１２，第２のスリーブ４２
２の内部に収納されている。現像はスリーブ回転により
行われ、第１のスリーブ４１２は時計方向に回転し、第
２のスリーブ４２２は反時計方向に回転することにより
第１の現像ロール４１の残留トナー１０に対する機械的
な掻き取り力を強めることができる。この他にも第１の
現像ロール４１の残留トナー１０にたいする機械的な掻
き取り力を強める方法として第１の現像ロールの現像ギ
ャップを第２の現像ロールの現像ギャップよりも狭くし
たり（Ｇｐ1＜Ｇｐ2)又、第１の現像ロールのドクタギ
ャップを第２の現像ロールのドクタギャップよりも広く
する（Ｇｄ1＞Ｇｄ2）方法、第１の現像ロール４１の回
転数をあげて現像剤の搬送速度をあげる方法、第１の磁
気ロール４１１の現像部での着磁力を強めるなどの方法
も有効である。FIG. 3 shows a second embodiment of the present invention. In the mechanical scraping force for the residual toner 10 on the photoconductor 1, the first developing roll 4 of the developing device 4
The developing condition is set so that 1 is stronger than the second developing roll 42. In the figure, the development gaps (distance between the development roll and the photoconductor) of the first and second development rolls are Gp 1 and Gp 2, and the doctor gap of the first and second development rolls (developing agent on the development roll The distance between the doctor blade 45 and the developing roll for defining the thickness is set to G
Let d 1 and Gd 2 . When the developer used is a two-component developer consisting of toner and carrier or a one-component magnetic toner, the developer roll is basically composed of a magnetic roll and a sleeve that can rotate with respect to each other in order to convey the developer by magnetic force. Composed. First magnetic roll 411, second magnetic roll 421
Is a cylindrical first sleeve 412, second sleeve 42
It is stored inside 2. The development is performed by rotating the sleeve, the first sleeve 412 rotates clockwise, and the second sleeve 422 rotates counterclockwise to mechanically scrape the residual toner 10 from the first developing roll 41. You can strengthen your strength. In addition to this, as a method for strengthening the mechanical scraping force of the residual toner 10 on the first developing roll 41, the developing gap of the first developing roll may be made narrower than the developing gap of the second developing roll (Gp 1 <Gp 2 ) Further, the doctor gap of the first developing roll is made wider than the doctor gap of the second developing roll (Gd 1 > Gd 2 ), and the number of rotations of the first developing roll 41 is increased. It is also effective to increase the transport speed of the magnetic recording medium (1) and to increase the coercive force of the first magnetic roll 411 at the developing portion.
【００１１】本実施例に示した残留トナー１０に対する
機械的な掻き取り力の効果を第１の実施例にて示した静
電的な回収力と同時に併用するのが望ましい。静電的な
回収力を強めるために図３に示したように第１の現像ロ
ール４１に第１のバイアス電圧４１０に交流バイアス電
圧４１３を重畳して残留トナー１０に電気的な振動を加
えるとよい。又、第１の磁気ロール４１１に機械的な振
動を加えると機械的な掻き取り力が増加する。It is desirable to use the effect of mechanical scraping force on the residual toner 10 shown in this embodiment together with the electrostatic collecting force shown in the first embodiment. As shown in FIG. 3, in order to enhance the electrostatic recovery force, when the AC bias voltage 413 is superimposed on the first bias voltage 410 on the first developing roll 41, the residual toner 10 is electrically vibrated. Good. Further, when mechanical vibration is applied to the first magnetic roll 411, the mechanical scraping force increases.
【００１２】図４は、本発明の第３の実施例を示したも
のである。第１，第２の実施例のように現像ロールを二
つ用いると、小型な記録装置を構成しずらい。このため
二つの現像部をひとつの現像機に一体化した。現像ロー
ル４３は磁気ロール４３０とスリーブ４３１より構成さ
れる。磁気ロール４３０は８極対称着磁され反時計方向
に回転して現像剤５１を時計方向に搬送する。スリーブ
４３１の現像部位置には絶縁膜４３２をかいして回収用
電極４３３と現像用電極４３４が設けてある。回収用電
極４３３には第１の実施例で示した第１のバイアス電圧
Ｖｂ1 とおなじ５０Ｖを、又、現像用電極４３４には第
２のバイアス電圧Ｖｂ2 とおなじ４００Ｖを印加する。
残留トナー１０は回収用電極４３３の電界により回収さ
れ、一方、感光体１上に形成した静電潜像は現像用電極
４３４の電界により現像される。図５は、本発明の第４
の実施例を示したものである。図４に示した実施例と異
なる点は、回収用電極４３３をなくし、スリーブ４３１
に回収用バイアス電圧４３５を印加したことにある。す
なわち、スリーブ４３１を回収用電極４３３の代りに用
いている。回収用バイアス電圧４３５に５０Ｖ印加する
ことにより残留トナー１０は回収される。本実施例によ
ればスリーブ４３１上の構造が簡単になるという効果が
ある。本実施例ではスリーブ４３１を回収用電極４３３
の代りに用いたが、回収用電極４３３を残し現像用電極
４３４をなくしてスリーブ４３１を現像用電極４３４の
代りに用いてもよい。この場合にはスリーブ４３１には
第２のバイアス電圧Ｖｂ2 とおなじ程度の例えば４００
Ｖを印加する。FIG. 4 shows a third embodiment of the present invention. If two developing rolls are used as in the first and second embodiments, it is difficult to construct a compact recording device. For this reason, the two developing parts were integrated into one developing machine. The developing roll 43 includes a magnetic roll 430 and a sleeve 431. The magnetic roll 430 is magnetized in an 8-pole symmetry and rotates counterclockwise to convey the developer 51 clockwise. A collecting electrode 433 and a developing electrode 434 are provided at a developing portion position of the sleeve 431 through an insulating film 432. The recovery electrode 433 is applied with the same 50 V as the first bias voltage Vb 1 shown in the first embodiment, and the development electrode 434 is applied with the same 400 V as the second bias voltage Vb 2 .
The residual toner 10 is collected by the electric field of the collecting electrode 433, while the electrostatic latent image formed on the photoconductor 1 is developed by the electric field of the developing electrode 434. FIG. 5 shows a fourth embodiment of the present invention.
FIG. The difference from the embodiment shown in FIG. 4 is that the recovery electrode 433 is eliminated and the sleeve 431 is omitted.
The recovery bias voltage 435 is applied to. That is, the sleeve 431 is used instead of the recovery electrode 433. The residual toner 10 is recovered by applying 50 V to the recovery bias voltage 435. According to this embodiment, there is an effect that the structure on the sleeve 431 is simplified. In this embodiment, the sleeve 431 is connected to the recovery electrode 433.
However, the sleeve 431 may be used instead of the developing electrode 434 by leaving the collecting electrode 433 and eliminating the developing electrode 434. In this case, the sleeve 431 has, for example, the same bias as the second bias voltage Vb 2 of 400
Apply V.
【００１３】図６は、本発明の第５の実施例を示したも
のである。図５に示した実施例と異なる点は、スリーブ
４３１の感光体１に対向する部分を平らに変形させてス
リーブ４３１と感光体１とのギャップが狭い領域を増加
させていることにある。本実施例によれば感光体１と現
像用電極４３４，スリーブ４３１とでつくる電界強度を
増加できるので残留トナー１０の回収効率及び現像性能
を増加できるという効果がある。FIG. 6 shows a fifth embodiment of the present invention. The difference from the embodiment shown in FIG. 5 is that the portion of the sleeve 431 facing the photoconductor 1 is flatly deformed to increase the region where the gap between the sleeve 431 and the photoconductor 1 is narrow. According to the present embodiment, the electric field strength created by the photoconductor 1 and the developing electrode 434 and the sleeve 431 can be increased, so that the collection efficiency of the residual toner 10 and the developing performance can be increased.
【００１４】図７は、本発明の第６の実施例を示したも
のである。図４，図５，図６に示した実施例と異なり、
磁気ロール４３０を固定してスリーブ４３１を反時計方
向に回転して現像している。スリーブ４３１に近接して
現像部の上流側にスクレーパ４３６を設け、反時計方向
に搬送する現像剤５１をスリーブ４３１から掻き取って
現像部へ送る。スクレーパ４３６は回収用電極４３３の
役割を果たし、第１の実施例で示した第１のバイアス電
圧Ｖｂ1 とおなじ程度の電圧例えば５０Ｖを印加し、
又、スリーブ４３１は現像用電極４３４の役割を果た
し、第２のバイアス電圧Ｖｂ2 とおなじ程度の電圧例え
ば４００Ｖを印加する。本実施例によればスリーブ回転
で現像剤を搬送するため磁気ロール回転にくらべ搬送性
をあげて高速印刷に対応できるという効果がある。本実
施例ではスクレーパ４３６は回収用電極４３３の役割を
果たしたが、現像部の下流側にスクレーパ４３６を設
け、スクレーパ４３６を現像用電極４３４の代りに用い
ることもできる。この場合にはスクレーパ４３６には第
２のバイアス電圧Ｖｂ2 とおなじ程度の例えば４００Ｖ
を印加し、スリーブ４３１には第１のバイアス電圧Ｖｂ
1 とおなじ程度の電圧例えば５０Ｖを印加する。FIG. 7 shows a sixth embodiment of the present invention. Unlike the embodiment shown in FIGS. 4, 5 and 6,
The magnetic roll 430 is fixed and the sleeve 431 is rotated counterclockwise for development. A scraper 436 is provided in the vicinity of the sleeve 431 and on the upstream side of the developing unit, and the developer 51 conveyed in the counterclockwise direction is scraped from the sleeve 431 and sent to the developing unit. The scraper 436 plays the role of the collecting electrode 433, and applies a voltage similar to the first bias voltage Vb 1 shown in the first embodiment, for example, 50V,
Further, the sleeve 431 plays the role of the developing electrode 434, and applies a voltage similar to the second bias voltage Vb 2 such as 400V. According to this embodiment, since the developer is conveyed by rotating the sleeve, there is an effect that the conveyability is improved as compared with the rotation of the magnetic roll and high speed printing can be supported. Although the scraper 436 plays the role of the recovery electrode 433 in this embodiment, the scraper 436 may be provided on the downstream side of the developing unit and the scraper 436 may be used instead of the developing electrode 434. In this case, the scraper 436 has the same voltage as the second bias voltage Vb 2 , for example, 400V.
Of the first bias voltage Vb is applied to the sleeve 431.
A voltage similar to 1 is applied, for example, 50V.
【００１５】[0015]
【発明の効果】以上述べたように、本発明の電子写真方
法によれば、感光体状の残留トナーを清掃するクリーナ
を必要とせず、感光体上の残留トナーが完全に現像部に
て回収でき、現像速度高速にでき、良好な画質を得るこ
とができるという効果がある。As described above, according to the electrophotographic method of the present invention, a cleaner for cleaning the residual toner on the photoconductor is not required, and the residual toner on the photoconductor is completely collected at the developing section. There is an effect that the developing speed can be increased and a good image quality can be obtained.
【図１】本発明の実施例を示すプリンタの構成図。FIG. 1 is a configuration diagram of a printer showing an embodiment of the present invention.
【図２】本発明の実施例を示す記録体の電位とバイアス
電位の説明図。FIG. 2 is an explanatory diagram of a potential of a recording medium and a bias potential according to an embodiment of the present invention.
【図３】本発明の実施例を示す現像機構成。FIG. 3 is a configuration of a developing machine showing an embodiment of the present invention.
【図４】本発明の実施例を示す現像機構成。FIG. 4 is a developing machine configuration showing an embodiment of the present invention.
【図５】本発明の実施例を示す現像機構成。FIG. 5 is a developing device configuration showing an embodiment of the present invention.
【図６】本発明の実施例を示す現像機構成。FIG. 6 is a developing machine configuration showing an embodiment of the present invention.
【図７】本発明の実施例を示す現像機構成。FIG. 7 is a configuration of a developing machine showing an embodiment of the present invention.
１…感光体、４…現像機、５…トナー、１０…残留トナ
ー、１１…クリーナ、４１…第１の現像ロール、４２…
第２の現像ロール、４３…現像ロール、４１０…第１の
バイアス電圧、４２０…第２のバイアス電圧、４３０…
磁気ロール、４３１…スリーブ、４３３…回収用電極、
４３４…現像用電極。1 ... Photosensitive member, 4 ... Developing device, 5 ... Toner, 10 ... Residual toner, 11 ... Cleaner, 41 ... First developing roll, 42 ...
Second developing roll, 43 ... Developing roll, 410 ... First bias voltage, 420 ... Second bias voltage, 430 ...
Magnetic roll, 431 ... Sleeve, 433 ... Collection electrode,
434 ... Development electrode.
Claims (3)
した静電潜像を、現像部にてトナーを付着させ顕像化
し、前記トナー像を記録紙に転写する電子写真方法にお
いて、前記現像部を複数設け、上流側の現像部は残留ト
ナーの回収性を高め、下流側の現像部は通常の現像性を
持たせることを特徴とする電子写真方法。1. An electrophotographic method in which an electrostatic latent image formed by exposing a uniformly charged surface of a photoconductor to light is made visible by adhering toner to a developing section and the toner image is transferred to a recording paper. The electrophotographic method is characterized in that a plurality of the developing units are provided, the developing unit on the upstream side enhances the recoverability of the residual toner, and the developing unit on the downstream side has a normal developing property.
バイアス電圧を前記上流側の現像部では前記下流側の現
像部よりも低くすることを特徴とする電子写真方法。2. The electrophotographic method according to claim 1, wherein the bias voltage applied to the developing unit is set lower in the upstream developing unit than in the downstream developing unit.
一の現像ロールの現像領域に設けられたことを特徴とす
る電子写真方法。3. The electrophotographic method according to claim 1, wherein the plurality of developing sections are provided in a developing area of a single developing roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5112700A JPH06324561A (en) | 1993-05-14 | 1993-05-14 | Electrophotography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5112700A JPH06324561A (en) | 1993-05-14 | 1993-05-14 | Electrophotography |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06324561A true JPH06324561A (en) | 1994-11-25 |
Family
ID=14593315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5112700A Withdrawn JPH06324561A (en) | 1993-05-14 | 1993-05-14 | Electrophotography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06324561A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100694146B1 (en) * | 2005-07-20 | 2007-03-12 | 삼성전자주식회사 | Hybride type developing apparatus and method |
| KR100708185B1 (en) * | 2005-09-26 | 2007-04-17 | 삼성전자주식회사 | Hybride type developing apparatus and method |
| KR100739763B1 (en) * | 2005-11-28 | 2007-07-13 | 삼성전자주식회사 | Hybride type electrophotographic image forming apparatus |
| JP2010230752A (en) * | 2009-03-26 | 2010-10-14 | Fuji Xerox Co Ltd | Developing device, method of producing developing device, and image forming apparatus |
-
1993
- 1993-05-14 JP JP5112700A patent/JPH06324561A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100694146B1 (en) * | 2005-07-20 | 2007-03-12 | 삼성전자주식회사 | Hybride type developing apparatus and method |
| US7489893B2 (en) | 2005-07-20 | 2009-02-10 | Samsung Electronics Co., Ltd. | Hybrid type developing apparatus and developing method |
| KR100708185B1 (en) * | 2005-09-26 | 2007-04-17 | 삼성전자주식회사 | Hybride type developing apparatus and method |
| KR100739763B1 (en) * | 2005-11-28 | 2007-07-13 | 삼성전자주식회사 | Hybride type electrophotographic image forming apparatus |
| JP2010230752A (en) * | 2009-03-26 | 2010-10-14 | Fuji Xerox Co Ltd | Developing device, method of producing developing device, and image forming apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000801 |