JPH01209468A - Liquid developing device - Google Patents
Liquid developing deviceInfo
- Publication number
- JPH01209468A JPH01209468A JP3449288A JP3449288A JPH01209468A JP H01209468 A JPH01209468 A JP H01209468A JP 3449288 A JP3449288 A JP 3449288A JP 3449288 A JP3449288 A JP 3449288A JP H01209468 A JPH01209468 A JP H01209468A
- Authority
- JP
- Japan
- Prior art keywords
- latent image
- carrier
- liquid toner
- electrostatic latent
- conductor part
- 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
- 239000007788 liquid Substances 0.000 title claims abstract description 27
- 239000004020 conductor Substances 0.000 claims abstract description 13
- 238000005513 bias potential Methods 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000010409 thin film Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 17
- 230000005684 electric field Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002609 medium Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 239000002612 dispersion medium Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、複写機やプリンタ等で用いられる静電像の現
像装置、特に液体現像剤を用いる液体現像装置に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrostatic image developing device used in copying machines, printers, etc., and particularly to a liquid developing device using a liquid developer.
〔従来の技術）
従来、複写機やプリンタ等で用いられる電子写真、静電
記録、イオノグラフィ等の記録プロセスでは、基本的に
潜像担体上に形成された静電潜像を、着色物でよ像化す
ることにより、記録物を得ている。[Prior art] Conventionally, in recording processes such as electrophotography, electrostatic recording, and ionography used in copying machines and printers, basically an electrostatic latent image formed on a latent image carrier is colored with a colored material. Records are obtained by converting them into images.
静電像の作り方は、−様帯電した光導電性体に露光する
方法や、多針電極やイオン放出ゲートにより誘電体上に
潜像を形成する方法等各種の方法が提案されている。ま
た、潜像担体がそのまま最終記録体であるものや、潜像
担体から記録媒体へ顕像化されたパタンを複写するもの
等色々なタイプがいる。静電潜像を、着色物で顕像化す
る現像プロセスは、これらの記録方式に共通である。Various methods have been proposed for producing electrostatic images, including a method of exposing a negatively charged photoconductive material to light, and a method of forming a latent image on a dielectric material using a multi-needle electrode or an ion emitting gate. There are also various types, such as those in which the latent image carrier is used as the final recording medium, and those in which a visualized pattern is copied from the latent image carrier to a recording medium. The development process of making an electrostatic latent image visible with a colored material is common to these recording methods.
現像方法には、着色物として粉体トナーを用いる乾式現
像法と、液体トナーを用いる湿式現像法とがある。乾式
現像法では、磁気力によってトナーを現像域まで搬送す
る磁気ブラシ現像法が広く用いられている。この現像法
では、着色剤として粉体のトナーを用いるために、トナ
ーの粉煙が発生し易く装置内外を汚損するという問題が
ある。Development methods include a dry development method using powder toner as a colored material and a wet development method using liquid toner. In the dry development method, a magnetic brush development method in which toner is transported to a development area by magnetic force is widely used. This developing method uses powdered toner as a coloring agent, so there is a problem in that toner powder smoke is likely to occur, staining the inside and outside of the apparatus.
また、粉体トナ・−像を記録媒体に固着させるために、
熱や圧力を加える定着プロセスが不可欠である。In addition, in order to fix the powder toner image to the recording medium,
A fixing process that applies heat and pressure is essential.
一方、湿式現像法においては、高抵抗性の有機液体中に
着色粒子を分散させた液体現像剤に潜像媒体を浸し、着
色粒子の電気泳動により潜像を現像する方法が一般的で
ある。しかし、本来現像されて欲しくない背景部に着色
粒子が付着して地汚れとなったり、分散媒を乾燥させる
必要があるため、装置周囲の有機液体蒸気の濃度が高く
なるという問題がある。On the other hand, in the wet development method, a latent image medium is generally immersed in a liquid developer in which colored particles are dispersed in a highly resistive organic liquid, and a latent image is developed by electrophoresis of the colored particles. However, there are problems in that colored particles adhere to background areas that are not originally desired to be developed, resulting in background smudges, and that the concentration of organic liquid vapor around the apparatus increases because the dispersion medium needs to be dried.
これらの問題を解決する液体現像方法として、米国特許
筒４．２０２，６２０号に、液体トナーの薄膜を潜像担
体と接触しないように接近させることにより、静電潜像
を現像する方法が提案されている。この現像方法では、
液体トナーの薄膜が潜像担体に接近すると、静電界によ
ってトナー薄膜から潜像担体に向ってトナーの突起部が
成長し、潜像部のみにトナーが接触付着する。このため
、地汚れがなく、余分な分散媒付着もない現像が得られ
る。更に、液体トナーとして、水性トナーが使用できる
ので、液体トナーの乾燥に際して好ましくない有機溶媒
蒸気の発生も起らない。As a liquid developing method that solves these problems, U.S. Pat. has been done. In this developing method,
When the thin film of liquid toner approaches the latent image carrier, toner protrusions grow from the thin toner film toward the latent image carrier due to the electrostatic field, and the toner contacts and adheres only to the latent image portion. Therefore, development can be obtained without background smearing and without adhesion of excess dispersion medium. Furthermore, since an aqueous toner can be used as the liquid toner, no undesirable organic solvent vapor is generated during drying of the liquid toner.
〔発明が解決しようとする課題〕
この現像方法では、トナー薄膜から成長する突起部は、
担体上の静電像とトナー層薄膜の自由表面上の微小な揺
ぎによる凸部との間の電界集中部に発生する。このため
、−様なベタ黒領域では突起部の発生が偏ってしまい、
均一なベタ黒現像ができず抜けが発生する。また、−炭
窒起部ができ始めると、その部分にますます電界が集中
し、近接した静電潜像に対しては、それぞれの潜像部に
対して複数の突起部が個別に形成されずに、最初に形成
された一つの突起部だけが成長して潜像に到達する。こ
のため、細かい潜像の再現ができず漬れてしまう。[Problems to be Solved by the Invention] In this developing method, the protrusions that grow from the toner thin film are
The electric field is generated in the area where the electric field is concentrated between the electrostatic image on the carrier and the convex portion due to minute fluctuations on the free surface of the thin toner layer. For this reason, protrusions are unevenly generated in --like solid black areas,
Uniform solid black development cannot be achieved, resulting in voids. Additionally, - when a carbonitrous raised part begins to form, the electric field becomes more and more concentrated in that part, and for electrostatic latent images that are close together, multiple protrusions are formed individually for each latent image part. Instead, only one protrusion formed initially grows to reach the latent image. As a result, fine latent images cannot be reproduced and are blurred.
本発明によれば、液体トナーを現像領域に搬送する担体
の表面が、導電体部と誘電体部とから成り、導電体部が
現像バイアス電位供給部に接続されている液体現像装置
が得られる。According to the present invention, there is obtained a liquid developing device in which the surface of a carrier that conveys liquid toner to a developing area is composed of a conductor part and a dielectric part, and the conductor part is connected to a development bias potential supply part. .
次に、本発明の一実施例を示した図面を参照して、本発
明の詳細な説明する。Next, the present invention will be described in detail with reference to the drawings showing one embodiment of the present invention.
第１図を参照すると、本発明の一実施例による現像スリ
ーブ１０の表面は、導電性の担体基体部の露出した導電
体部１１および誘電体部１２の二つの領域から成ってい
る。このような表面を持つ現像スリーブ１０は、先ず導
電性部材でできた円筒の表面にエツチング等の手段によ
り凹凸を設け、次に合成樹脂等の誘電体材料によって凹
凸を埋めた後、表面を研磨することによって得ることが
できる。Referring to FIG. 1, the surface of a developer sleeve 10 according to one embodiment of the present invention consists of two regions, an exposed conductor portion 11 and a dielectric portion 12 of a conductive carrier substrate. The developing sleeve 10 having such a surface is manufactured by first forming irregularities on the surface of a cylinder made of a conductive material by means such as etching, then filling the irregularities with a dielectric material such as synthetic resin, and then polishing the surface. You can get it by doing
第２図に示すように、このような表面を持つ現像スリー
ブ１０上に、ドクターブレード１３で規制しながら、液
体トナー薄層を形成し、現像スリーブ１０の回転と共に
トナー薄層を現像領域に搬送する。As shown in FIG. 2, a thin layer of liquid toner is formed on the developing sleeve 10 having such a surface while being regulated by a doctor blade 13, and as the developing sleeve 10 rotates, the thin layer of liquid toner is conveyed to the developing area. do.
第３図は現像部を感光ドラム１５の中心軸に沿った方向
に表わしたもので、同図（ａ）〜（ｃ）ともに、左側が
均一な電位分布の黒ベタ部分、右側が分離した静電潜像
が近接して存在している領域に対応している。第３図（
ａ＞は現像スリーブ１０上に液体トナー１４の薄層が形
成されている状態で、感光ドラム１５上の静電潜像によ
って液体トナー１４が吸引される前の状態を示している
。感光ドラム１５と現像スリーブ１０とが接近すると、
両者間の空間の電界強度が増加し、液体トナー１４の表
面つ）ら突起部が形成される。この際、現像スリーブ１
０の導電体部１１を通して液体トナー層への電荷の注入
が行なわれるため、第３図（ｂ）に示されるように、液
体トナーの突起は、導電体部１１の部分において形成さ
れ易くなる。このため、突起形成は、予め担体上に形成
された導電体部１１の配置によって決定されるので、第
３図（ｃ）に示されるように、−様なベタ黒靜電潜像１
６ａにおいても突起形成が偏ることなく、抜けのない均
一なベタ黒現像が行なわれる。Figure 3 shows the developing section in the direction along the central axis of the photosensitive drum 15. In both figures (a) to (c), the left side is a solid black area with a uniform potential distribution, and the right side is a separated static area. This corresponds to an area where the electrostatic latent images are located close to each other. Figure 3 (
a> shows a state in which a thin layer of liquid toner 14 is formed on the developing sleeve 10 and before the liquid toner 14 is attracted by the electrostatic latent image on the photosensitive drum 15. When the photosensitive drum 15 and the developing sleeve 10 approach each other,
The electric field strength in the space between the two increases, and a protrusion is formed on the surface of the liquid toner 14. At this time, developing sleeve 1
Since charge is injected into the liquid toner layer through the conductive portion 11 of 0, liquid toner protrusions are likely to be formed in the portion of the conductive portion 11, as shown in FIG. 3(b). Therefore, since the formation of protrusions is determined by the arrangement of the conductor portions 11 previously formed on the carrier, as shown in FIG.
6a as well, the formation of protrusions is not biased, and uniform solid black development without omissions is performed.
また、近接した静電潜像１６ｂおよび１６ｃに対しても
、それぞれの潜像部に対して複数の突起部が個別に形成
され易く、漬れのない精細な現像が得られる。Further, for the electrostatic latent images 16b and 16c that are close to each other, a plurality of protrusions are easily formed individually for each latent image portion, and fine development without smearing can be obtained.
上述のように、本発明によれば、液体トナーを現像領域
に搬送する担体の表面を現像バイアス電位供給部と接続
される導電体部と、誘電体部とから構成することにより
、黒ベタ領域では印字抜けのない均一な黒ベタが再現で
きる。また、細かい静電潜像も漬れることなく忠実に再
現できる。As described above, according to the present invention, the surface of the carrier that conveys the liquid toner to the development area is composed of the conductor part connected to the development bias potential supply part and the dielectric part, so that the solid black area can be improved. With this, you can reproduce uniform black solids without missing prints. In addition, even fine electrostatic latent images can be faithfully reproduced without blurring.
第１図（ａ）および（ｂ）は本発明の一実施例における
静電スリーブの平面図および断面図、第２図は本発明の
一実施例の断面図、第３図（ａ）〜（ｃ）は本発明の実
施例の動作を説明するための図である。
１０：現像スリーブ、１１：導電体部、１２：誘電体部
、１３：ドクターブレード、１４：液体トナー、１５：
感光ドラム、１６ （１６ａ〜１６ｃ）：静電潜像。
代理人 弁理士 内 原 晋
（ａ、）
（ｂ）
消１回
卆３０1(a) and (b) are a plan view and a sectional view of an electrostatic sleeve according to an embodiment of the present invention, FIG. 2 is a sectional view of an embodiment of the present invention, and FIGS. 3(a) to ( c) is a diagram for explaining the operation of the embodiment of the present invention. 10: developing sleeve, 11: conductor section, 12: dielectric section, 13: doctor blade, 14: liquid toner, 15:
Photosensitive drum, 16 (16a to 16c): electrostatic latent image. Agent Patent Attorney Susumu Uchihara (a,) (b) 30 volumes
Claims (1)
体部と誘電体部とから成り、前記導電体部が現像バイア
ス電位供給部に接続されていることを特徴とする液体現
像装置。A liquid developing device characterized in that a surface of a carrier that conveys liquid toner to a development area is made up of a conductor part and a dielectric part, and the conductor part is connected to a development bias potential supply part.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3449288A JPH01209468A (en) | 1988-02-16 | 1988-02-16 | Liquid developing device |
| US07/311,553 US4982692A (en) | 1988-02-16 | 1989-02-16 | Apparatus for liquid development of electrostatic latent images |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3449288A JPH01209468A (en) | 1988-02-16 | 1988-02-16 | Liquid developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01209468A true JPH01209468A (en) | 1989-08-23 |
Family
ID=12415744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3449288A Pending JPH01209468A (en) | 1988-02-16 | 1988-02-16 | Liquid developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01209468A (en) |
-
1988
- 1988-02-16 JP JP3449288A patent/JPH01209468A/en active Pending
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