JPS5870258A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPS5870258A JPS5870258A JP16927081A JP16927081A JPS5870258A JP S5870258 A JPS5870258 A JP S5870258A JP 16927081 A JP16927081 A JP 16927081A JP 16927081 A JP16927081 A JP 16927081A JP S5870258 A JPS5870258 A JP S5870258A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- developing
- magnetic
- sleeve
- developing device
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0907—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with bias voltage
Abstract
Description
【発明の詳細な説明】
本発明は潜偉保持体上に形成された潜偉を現像する現像
装置に関するものである０％に、現像剤担持体上に一様
に薄層コーティングされた現像剤層の中の電荷量の小さ
な現像剤を取や除くために、現像剤担持体に近接して導
電性部材を設けた現像装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device for developing a latent layer formed on a latent layer holder. The present invention relates to a developing device in which a conductive member is provided in close proximity to a developer carrier in order to remove developer having a small amount of charge in a layer.
従来、現像剤担持体上の現像剤の内、電荷量の小さな現
像剤は、現像剤担持体との電界力が小さく現像剤担持体
との吸着力が小さいために、感光体上の表面電位が画像
形成する電位レベル以Ｆであっても感光体上に付着し、
カプリの原因となっていた。また、現像器からの現像剤
飛散の原因ともなっていた。Conventionally, among the developer on the developer carrier, the developer with a small electric charge has a small electric field force with the developer carrier and a small adsorption force with the developer carrier, so the surface potential on the photoconductor decreases. adheres to the photoreceptor even if the voltage is below the image forming potential level,
It was the cause of Capri. Moreover, it also caused the developer to scatter from the developing device.
従来は、カプリ防止のために感光体の画像形成電位と同
極性の現像バイアスを現像剤担持体に印加し、感光体と
現像剤担持体との電位差を減少させる方法をとっていた
。しかし、この方法ではカプリを防止できても、上記低
電荷量の現像剤により博学再現性に問題を残し、また感
光体上の表面電位も高い値に設定し３ければならない欠
点がある。また現像剤飛散に対して本有効な手段とはな
り得ない。Conventionally, in order to prevent capri, a developing bias having the same polarity as the image forming potential of the photoreceptor is applied to the developer carrier to reduce the potential difference between the photoreceptor and the developer carrier. However, even if this method can prevent capri, it still has the disadvantage that the low charge amount of the developer leaves problems in optical reproducibility, and the surface potential on the photoreceptor must also be set at a high value. Further, it cannot be an effective means for preventing developer scattering.
本発明は、上記従来の現像装置の欠点を排除し、カプリ
のない画像が得られ、現像剤飛散のない現像装置の提供
を目的とするものである。It is an object of the present invention to eliminate the drawbacks of the conventional developing apparatus described above, to provide a developing apparatus capable of obtaining images without capri, and free from developer scattering.
本発明は現像剤担持体に近接して導電性部材、好ましく
は導電性ローラーを設け、このローラーに現像剤の持つ
電荷とは逆極性の直流バイアスを印加し、低電荷量の現
像剤を取り除くようにしたものである。これによりカプ
リを防止することが可能となる。また、これにより現像
バイアス印加による感光体と現像剤担持体との電位差を
減少させる必要がなくなる丸めに、感光体の表面電位を
低電位として良好な画像再現性が得られる。In the present invention, a conductive member, preferably a conductive roller, is provided in the vicinity of the developer carrier, and a DC bias having a polarity opposite to that of the developer is applied to the roller to remove the developer with a low charge amount. This is how it was done. This makes it possible to prevent capri. Moreover, this eliminates the need to reduce the potential difference between the photoreceptor and the developer carrier due to the application of a developing bias, and it is possible to obtain good image reproducibility by lowering the surface potential of the photoreceptor.
以下図面を用いて本発明の詳細な説明する。The present invention will be described in detail below using the drawings.
第１図は本発明を適用した現像装置の断面図で、図中、
１はｍ律支持体６の上に形成された潜像を現像するため
のスリーブ状の現像剤担持体（以下、現像スリーブと称
する）を示し、その上に磁性−成分現像剤５が現像スリ
ーブと感光体との間隔よりも薄く均一にコーティングさ
れる。この現像スリーブ１の内部には磁界を発生する磁
石２１〜２５を有する磁界発生手段２が固定配置され、
且つ磁石２１に略本対応した位置で、現像スリーブ１の
表面近くに磁性体又は磁石からなる磁気カットブレード
４が配置されている。FIG. 1 is a sectional view of a developing device to which the present invention is applied, and in the figure,
Reference numeral 1 denotes a sleeve-shaped developer carrier (hereinafter referred to as a developing sleeve) for developing a latent image formed on an m-rule support 6, and a magnetic component developer 5 is placed on the developing sleeve. The coating is thinner and more uniform than the distance between the photoreceptor and the photoreceptor. A magnetic field generating means 2 having magnets 21 to 25 that generate a magnetic field is fixedly arranged inside the developing sleeve 1,
Further, a magnetic cutting blade 4 made of a magnetic material or a magnet is arranged near the surface of the developing sleeve 1 at a position approximately corresponding to the magnet 21 .
また、現像スリーブ１上のカット磁極２１と現像磁極２
２に対応する位置の間に導電性ローラー８が設けられて
いる。In addition, the cut magnetic pole 21 on the developing sleeve 1 and the developing magnetic pole 2
A conductive roller 8 is provided between positions corresponding to 2.
第２甲に導電性ローラ一部分の部分拡大図を示す、ロー
ラー８には一成分磁性トナー５とは逆極性となる直流バ
イアス電圧が印加されている。導電性ローラー８上の現
像・剤を取り除くためにクリーニングブレード７が磁気
カットブレード４の上に配置されている。A partial enlarged view of a portion of the conductive roller is shown in the second A. A DC bias voltage having a polarity opposite to that of the one-component magnetic toner 5 is applied to the roller 8 . A cleaning blade 7 is placed above the magnetic cutting blade 4 to remove the developer/agent on the conductive roller 8.
現像を行なう時は、現像スリーブ１上に一様に薄層コー
ティングされた現像剤層５０中の電荷量の小さな現像剤
が、現像剤と逆極性の直流バイアスを印加された導電性
ローラー８に付着され、クリーニングブレード７で再び
現像容器３内へ回収される。また現像スリーブ上の現像
剤は現像極上２２で現像され感光体６上に画像形成され
る。この時スリーブ２と感光体６との間には現像バイア
ス電源９により交番電圧が印加されている。When performing development, the developer with a small amount of charge in the developer layer 50 uniformly coated in a thin layer on the developing sleeve 1 is applied to the conductive roller 8 to which a DC bias of opposite polarity to the developer is applied. The toner particles are deposited and collected into the developer container 3 again by the cleaning blade 7. Further, the developer on the developing sleeve is developed by a developing layer 22 to form an image on the photoreceptor 6. At this time, an alternating voltage is applied between the sleeve 2 and the photoreceptor 6 by a developing bias power source 9.
〔実施例Ｊ
５０ｖとし、導電性ローラーの印加電圧をＯｖとして、
１２５■／ｓＰｃのプロセス速度（感光体回転速度）で
現像を行ったところ、第３図の曲線ａに示すＶ−Ｄ特性
が得られた。これに対して、現像バイアスの直流成分を
Ｏｖ、電源１０から導電性ローラーへの印加電圧を＋１
００ｖとし、他を同一条件として現像したところ、第３
図の曲線すの特性を示した。また、感光体上の暗部電位
＋４００ｖ、現像バイアスを周波数８００Ｈｚ１交流成
分１２００ ｖｐ ｐ 、直流成分ＯＶ、導電性１：１
−７８へＯ印加電圧を１００ Ｖとして現像を行った結
果、第３図の曲線Ｃの特性を示した。因に縦軸は画像濃
度りを、横軸は感光体上の表面電位Ｍを表わしている。[Example J The voltage applied to the conductive roller is Ov, and the voltage is 50V.
When development was carried out at a process speed (photoreceptor rotation speed) of 125 .mu./sPc, a V-D characteristic shown in curve a in FIG. 3 was obtained. On the other hand, the DC component of the developing bias is Ov, and the voltage applied from the power supply 10 to the conductive roller is +1.
00v, and when developing under the same conditions, the third
The characteristics of the curve shown in the figure are shown. In addition, the dark area potential on the photoreceptor is +400V, the developing bias is set to a frequency of 800Hz, an AC component of 1200 vp p, a DC component of OV, and a conductivity of 1:1.
-78 was developed with an O applied voltage of 100 V, and as a result, the characteristics shown by curve C in FIG. 3 were exhibited. Incidentally, the vertical axis represents the image density, and the horizontal axis represents the surface potential M on the photoreceptor.
このグラフから明らかなように、導電性ローラーへの印
加電圧を変えることにより、Ｖ−Ｄ特性におけるγをコ
ントロールすることができた。また、導電性ローラーを
用いるととによってカプリを生じることなく鮮明な藩学
を再現し、また感光体の暗部電位を低電位にしても充分
な濃度が得られる現像が行えることが明らかとなった。As is clear from this graph, it was possible to control γ in the V-D characteristics by changing the voltage applied to the conductive roller. It has also been revealed that by using a conductive roller, it is possible to reproduce a clear image without producing capri, and to achieve development with sufficient density even when the dark area potential of the photoreceptor is set to a low potential.
史に低電荷現像剤を事前に除去することによって機械内
の現像剤飛散を減少させる効果も得られる。Preliminary removal of low charge developer also has the effect of reducing developer scattering within the machine.
第１図は本発明を適用した現像器の断面図、図において
、ｌ・・・・−・現像スリーブ、２・・・・・・磁石ロ
ール、３・・・・−・現像剤ホッパー、４・・・・・・
・磁気カットブレード、５・・・・・・現像剤（トナー
）、６・・・・・−感光体、７・・・・・・クリーニン
グブレード、８・・・・・・導電性ローラー、９・・・
・・・現像バイアス電源、１０・・・・・・電源、２１
・・・・・・カット磁極、２２・・・・・・現像磁極、
２３．２４．２５・・・・・・搬送磁極を表わす。
出 願 人 キャノン株式会社FIG. 1 is a sectional view of a developing device to which the present invention is applied.・・・・・・
・Magnetic cut blade, 5...Developer (toner), 6...-Photoreceptor, 7...Cleaning blade, 8...Conductive roller, 9 ...
...Development bias power supply, 10...Power supply, 21
......Cut magnetic pole, 22...Development magnetic pole,
23.24.25...Represents the transport magnetic pole. Applicant Canon Co., Ltd.
Claims (3)
、現像剤の厚み規制部材によって該現像剤を現像剤担持
体上に層状に塗布し、現像位置へ運んで層像保持体上の
ｍ像を現像する現像装置におい１て、上記現像剤厚み規
制部材と現像位置との間に、現像剤担持体に近接して導
電性部材を設け、この導電性部材に現像剤の持つ電荷と
は逆極性の直流バイアスを印加したことを特徴とする現
像装置。(1) A one-component magnetic developer is supplied onto the developer carrier, the developer is coated in a layer on the developer carrier by a developer thickness regulating member, and the developer is transported to a development position and placed on the layered image carrier. In a developing device for developing an m-image of A developing device characterized by applying a DC bias of opposite polarity.
とする特許請求の範囲第１項記載の現像装置。(2) The developing device according to claim 1, wherein the conductive member has a roller shape.
ニング部材を設け、除去した現像剤を現像器内へ回収す
ることを特徴とする特許請求の範囲第１積記載の現像装
置。(3) The developing device according to claim 1, further comprising a cleaning member for removing the developer on the conductive roller, and collecting the removed developer into the developing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16927081A JPS5870258A (en) | 1981-10-22 | 1981-10-22 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16927081A JPS5870258A (en) | 1981-10-22 | 1981-10-22 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5870258A true JPS5870258A (en) | 1983-04-26 |
Family
ID=15883387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16927081A Pending JPS5870258A (en) | 1981-10-22 | 1981-10-22 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5870258A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63226678A (en) * | 1987-03-17 | 1988-09-21 | Canon Inc | Developing device |
| US6381424B1 (en) | 1999-10-28 | 2002-04-30 | Fujitsu Limited | Toner charge control for image defect reduction |
-
1981
- 1981-10-22 JP JP16927081A patent/JPS5870258A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63226678A (en) * | 1987-03-17 | 1988-09-21 | Canon Inc | Developing device |
| US6381424B1 (en) | 1999-10-28 | 2002-04-30 | Fujitsu Limited | Toner charge control for image defect reduction |
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