JPH0371162A - Developing device - Google Patents

Developing device

Info

Publication number
JPH0371162A
JPH0371162A JP1206843A JP20684389A JPH0371162A JP H0371162 A JPH0371162 A JP H0371162A JP 1206843 A JP1206843 A JP 1206843A JP 20684389 A JP20684389 A JP 20684389A JP H0371162 A JPH0371162 A JP H0371162A
Authority
JP
Japan
Prior art keywords
developer
developing device
latent image
flying
developing
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
Application number
JP1206843A
Other languages
Japanese (ja)
Inventor
Kenichi Nakamura
賢一 中村
Mikio Yamamoto
山本 美樹夫
Masatsugu Kajimoto
梶本 昌嗣
Tsurayuki Sunaga
須長 貫行
Hidekiyo Tachibana
英清 立花
Yutaka Toyoda
裕 豊田
Kazuo Terao
寺尾 和男
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP1206843A priority Critical patent/JPH0371162A/en
Publication of JPH0371162A publication Critical patent/JPH0371162A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To prevent the splashing of a toner by installing a small electrode for preventing splashing of a developer near the downstream side of a developer flying region between a latent image carrying member and a developer carrying member. CONSTITUTION:The wire electrode 37 is extended near the downstream side of the developer flying region 36 between a photosensitive drum 11 and a developing sleeve 32. The prescribed bias voltage of the same polarity as the charge polarity of the developer 31 is impressed by a power source 38 to this wire electrode 37. The developer 31 which tends to splash from the developer flying region 36 between the photosensitive drum 11 and the developing sleeve 32 is, therefore, repulsed by the electric field generated by the wire electrode 37 and is returned to the developing sleeve 32 side, by which the developer 31 is recovered into a developing device 25 as the developing sleeve 32 rotates.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、電子写真複写機やレーザービームプリンタ
等の画像形成装置に使用される現像装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing device used in an image forming apparatus such as an electrophotographic copying machine or a laser beam printer.

[従来の技術] 従来、上記電子写真複写機やレーザービームプリンタ等
の画像形成装置においては、通常の黒色の単色画像を複
写するもの以外にも、同時2色複写やカラー複写等の機
能を備えたものがある。そして、上記画像形成装置は、
その機能に応じて黒色の現像装置、あるいは黒色現像装
晴の他に赤色現像装置等の複数の現像装置を備えたもの
がある。
[Prior Art] Conventionally, image forming apparatuses such as the above-mentioned electrophotographic copying machines and laser beam printers have functions such as simultaneous two-color copying and color copying in addition to those capable of copying ordinary black monochrome images. There is something. Then, the image forming apparatus has the following features:
Depending on the function, some are equipped with a black developing device or a plurality of developing devices such as a red developing device in addition to a black developing device.

また、上記現像装置で採用されるの現像方式としては、
その画像形成条件に応じて、トナーとキャリアとからな
る二成分の現像剤を用い、この現像剤の磁気ブラシを潜
像担持体上に接触させることによって現像を行なう二成
分磁気ブラシ現像方式や、トナーのみからなる一成分の
現像剤を用い、この現像剤を潜像担持体との間で飛翔さ
せて現像する一成分ジャンピング現像方式等がある。
In addition, the developing method adopted in the above developing device is as follows:
Depending on the image forming conditions, a two-component magnetic brush development method uses a two-component developer consisting of toner and carrier, and develops by bringing a magnetic brush of this developer into contact with the latent image carrier; There is a one-component jumping development method in which a one-component developer consisting only of toner is used and the developer is caused to fly between a latent image carrier and the image is developed.

しかし、上記現像装置の場合、特に−成分現像剤を使用
づる現像装置の場合には、現像剤が現像装置と潜像担持
体の間で飛翔し、しかも潜像担持体は、比較的高い周速
で回転しているため、現像剤が現像装置と潜像担持体と
の間隙から漏れて周囲に飛敗し、周囲を汚損するという
問題点があった。この問題点は、−成分現像剤を使用す
る現像装置の場合に特に顕著であるが、二成分磁気ブラ
シ現像方式を用いた現像装置でも同様に問題となる。
However, in the case of the above-mentioned developing device, especially in the case of a developing device using a -component developer, the developer flies between the developing device and the latent image carrier, and the latent image carrier has a relatively high rotational speed. Since the developing device rotates at a high speed, there is a problem in that the developer leaks from the gap between the developing device and the latent image carrier and splashes around, contaminating the surrounding area. This problem is particularly noticeable in a developing device that uses a -component developer, but it is also a problem in a developing device that uses a two-component magnetic brush developing method.

また、複数の現像装置を備えた画像形成装置においては
、潜像担持体の回転方向の上流側から漏れた現像剤が、
下流側に配置された現像装置の内部に侵入し、現像剤の
混色を起こすという問題点があった。
In addition, in an image forming apparatus equipped with a plurality of developing devices, developer leaking from the upstream side in the rotational direction of the latent image carrier may
There was a problem in that the particles invaded the inside of the developing device located on the downstream side and caused color mixing of the developer.

そこで、上記の問題点を解決するものとして、特開昭6
2−223773 号公報に示づようなものが既に提案
されている。これは、第10図に示すように、静電潜像
担持体100の表面に対向して複数の現像手段101.
102を並設した静電潜像現像装置にJ3いて、各現像
手段101.102が隣接する仕切り部分に、先端を静
電潜像担持体100の表面に苅向せしめC設備され、E
つ少なくとも該先端部分の表面が導電性を右するトナー
混入防止板103と、前記トナー混入防止板103にバ
イアス電圧を印加づ−るバイアス印加手段104とを備
えるように構成されている。
Therefore, as a solution to the above problems,
A method as shown in Japanese Patent No. 2-223773 has already been proposed. As shown in FIG. 10, a plurality of developing means 101.
In the electrostatic latent image developing device J3 in which the developing means 101 and 102 are arranged side by side, each of the developing means 101 and 102 is installed in an adjacent partition part with the tip facing the surface of the electrostatic latent image carrier 100, and
The toner mixing prevention plate 103 has a conductive surface at least at its tip, and a bias applying means 104 applies a bias voltage to the toner mixing prevention plate 103.

[発明が解決しようとする課題] しかし、上記従来技術の場合には、次に示づ”J、うな
問題点を有している。すなわち、上記現像装置の場合に
は、トナー混入防止板103によって他の現像手段10
2への1〜ナーの混入はある程度防止することができて
も、現像手段10”l、102からのドブ−の飛散を根
本的に防止勺るしのではないため、上流側の現像手段1
01から飛散じようとする1〜ナーが、この現像手段1
01の内部に堆積し、通常のトナーの搬送特性を妨げる
という問題点があった。また、下流側の現像手段102
からのトナー飛散が問題どなる場合には、これをまった
く防止づることができないという問題点があった。
[Problems to be Solved by the Invention] However, in the case of the above-mentioned conventional technology, there is a problem as shown below. Namely, in the case of the above-mentioned developing device, the toner contamination prevention plate 103 Other developing means 10
Even if it is possible to prevent to some extent the mixing of toners 1 to 2 into the developing means 102, it does not fundamentally prevent the scattering of gutter from the developing means 10''l and 102.
The toner particles 1 to 01 that are about to scatter from the developing means 1
There is a problem in that the toner particles accumulate inside the toner and interfere with the normal toner transport characteristics. Further, the downstream developing means 102
If toner scattering becomes a problem, there is a problem in that it cannot be prevented at all.

[課題を解決するための手段」 そこで、この発明は、上記従来技術の問題点を解決する
ためになされたもので、その[l的どするところは、現
像手段からのトナーの飛散を根本的に防止することがで
き、現像手段内への1〜ナーの堆積や、潜像担持体の下
流側の現像手段においても1−ナーの飛散を防止可能な
現像装置を提供することにある。
[Means for Solving the Problems] Therefore, the present invention was made to solve the above-mentioned problems of the prior art. It is an object of the present invention to provide a developing device which can prevent 1-toner from accumulating in a developing means and also prevent 1-toner from scattering in a developing section downstream of a latent image carrier.

すなわち、この発明は、潜像担持体上に形成された静電
潜像を、現像剤担持体の周囲に保持された現像剤を飛翔
させて可視像化づる現像装置にd3いて、上記潜像担持
体と現像剤担持体の間の現像剤飛翔領域下流側近傍に、
小ざい現像剤担持体14二用電極を架設し、この現像剤
飛散防止用電極に所定のバイアス電圧を印加づ゛る1:
うに構成されている。
That is, the present invention provides a developing device (d3) that converts an electrostatic latent image formed on a latent image carrier into a visible image by flying a developer held around the developer carrier. Near the downstream side of the developer flying area between the image carrier and the developer carrier,
An electrode for the small developer carrier 142 is installed, and a predetermined bias voltage is applied to this electrode for preventing scattering of developer.1:
It is composed of

また、この発明は、潜像担持体上に形成された静電潜像
を、現像剤担持体の周囲に保持された現像剤を飛翔させ
て可視像化する現像装置にJjいて、−に配溝像担持体
と現像剤担持体の間の現像剤飛翔領域下流側近傍に、飛
翔する現像剤を装置内l\導く気流を発生ざ仕る気流発
生部拐を架設づるように11′4成されている。
Further, the present invention provides a developing device that visualizes an electrostatic latent image formed on a latent image carrier by causing developer held around the developer carrier to fly. An airflow generating part 11'4 is installed near the downstream side of the developer flying region between the grooved image carrier and the developer carrier to generate an airflow that guides the flying developer into the apparatus. has been completed.

さらに、この発明は、潜像担持体トに形成された静電潜
像を、現像剤担持体の周囲に保持された現像剤を飛翔さ
せて可視像化する現像装置において、上記潜像10持体
ど現像剤担持体の間の現像剤飛翔領域下流側近傍に、少
なくとも表面が導電性を右し、しかも飛翔する現像剤を
独匝内へ導く気流を発生さける気流発牛部拐を架設する
どともに、この気流発生部第1に所定のバイアス電圧を
印加するように構成されている。
Furthermore, the present invention provides a developing device that visualizes an electrostatic latent image formed on a latent image carrier by flying a developer held around the developer carrier. Near the downstream side of the developer flying area between the developer carriers, an airflow generating part is installed at least on the surface of which is electrically conductive, and which avoids generating an airflow that guides the flying developer into the container. At the same time, a predetermined bias voltage is applied to the first airflow generating section.

[作用1 この発明においては、潜像担持体と現像剤担持体の間の
現像剤飛翔領域下流側近傍に、小ざい現像剤飛散防止用
電極を架設し、この現像剤飛散防止用電極に所定のバイ
アス電圧を印加するように構成したので、潜像担持体と
現像剤担持体の間の現像剤飛翔領域から外部に飛散しよ
うとする現像剤は、現像剤飛散防止用電極が作る電界に
よって反発され、現像装置内へ戻されるので、現像剤の
飛散が根本的に防止される。
[Function 1] In the present invention, a small developer scattering prevention electrode is installed near the downstream side of the developer flying region between the latent image carrier and the developer carrier, and a predetermined electrode is installed on the developer scattering prevention electrode. Since the structure is configured to apply a bias voltage of Since the developer is removed and returned into the developing device, scattering of the developer is fundamentally prevented.

また、この発明においては、潜像担持体と現像剤担持体
の間の現像剤飛翔領域下流側近傍に、飛翔する現像剤を
装置内へ導く気流を発生させる気流発生部材を架設する
ように構成したので、潜像担持体と現像剤担持体の間の
現像剤飛翔領域から外部に飛散しようとする現像剤は、
気流発生部材にJ:つて装置内へ戻され、現像剤の飛散
が根本的に防止される。
Further, in the present invention, an airflow generating member for generating an airflow that guides the flying developer into the device is installed near the downstream side of the developer flying region between the latent image carrier and the developer carrier. Therefore, the developer that tries to scatter to the outside from the developer flying area between the latent image carrier and the developer carrier is
The developer is returned to the airflow generating member into the apparatus, and scattering of the developer is fundamentally prevented.

ざらに、この発明においては、潜像担持体ど現像剤担持
体の間の現像剤飛翔領域下流側近傍に、少なくとも表面
が導電性を有し、しかも飛翔する現像剤を装置内へ導く
気流を発生さ吐る気流発生部材を架設するとともに、こ
の気流発生部材に所定のバイアス電圧を印加するように
構成したので、潜像担持体と現像剤担持体の間の現像剤
飛翔領域から外部に飛散しようとする現像剤は、気流発
生部材によって装置内へ戻されるどともに、気流発生部
材が作る電界によって反発され、現像装置内へ戻される
ので、現像剤の飛散が根本的に防出される。
In general, in the present invention, at least the surface of the latent image carrier is electrically conductive in the vicinity of the downstream side of the developer flying region between the developer carriers, and an air current is provided to guide the flying developer into the device. Since the airflow generating member is installed and a predetermined bias voltage is applied to the airflow generating member, the developer is not scattered to the outside from the flying region between the latent image carrier and the developer carrier. The developer to be used is returned to the inside of the developing device by the airflow generating member, and is also repelled by the electric field created by the airflow generating member and returned to the inside of the developing device, so that scattering of the developer is fundamentally prevented.

[実施例] 以下にこの発明を図示の実施例に基づいて説明する。[Example] The present invention will be explained below based on illustrated embodiments.

第3図はこの発明に係る現像装置を適用し得る電子写真
複写機を示すものである。図において、1は原稿2を載
置するプラテンガラスであり、このブラデンガラス1上
に載置された原稿2は、光源3によって照明される。そ
して、原稿2からの反則光像は、ミラーペ、5.6.7
.8.9及びレンズ10を介して感光体ドラム11上に
導かれる。この感光体ドラム11の表面は、画像露光に
先だって一次帯電器12によって一様に帯電される。
FIG. 3 shows an electrophotographic copying machine to which the developing device according to the present invention can be applied. In the figure, 1 is a platen glass on which an original 2 is placed, and the original 2 placed on the Braden glass 1 is illuminated by a light source 3. And the foul light image from the original 2 is a mirror image, 5.6.7
.. 8.9 and the lens 10 onto the photosensitive drum 11. The surface of the photosensitive drum 11 is uniformly charged by a primary charger 12 prior to image exposure.

そして、上記のごとく感光体ドラム11の表面には、原
稿2の画像が露光され、静電潜像が形成される。この静
電潜像は、選択的に作動する現像装置13又は14にJ
:つて現像されて、トナー像となる。
Then, as described above, the image of the original document 2 is exposed to light on the surface of the photosensitive drum 11, and an electrostatic latent image is formed. This electrostatic latent image is transferred to a selectively activated developing device 13 or 14.
: It is developed and becomes a toner image.

上記感光体ドラム11の表面に形成されたトナー像は、
後述づるようにして感光体ドラム11の表面へと搬送さ
れる転写用紙15上に転写帯電器16の帯電によって転
写される。上記転写用紙15は、給紙カセット17から
給紙ローラー8によって給紙された後、レジストローラ
ー9の位置で一旦停止され、このレジストローラー9に
よって所定のタイミングで感光体ドラム11の表面へと
搬送される。
The toner image formed on the surface of the photoreceptor drum 11 is
The image is transferred onto the transfer paper 15, which is conveyed to the surface of the photoreceptor drum 11, by being charged by the transfer charger 16, as will be described later. After the transfer paper 15 is fed from the paper feed cassette 17 by the paper feed roller 8, it is temporarily stopped at the position of the registration roller 9, and is conveyed to the surface of the photoreceptor drum 11 by the registration roller 9 at a predetermined timing. be done.

上記1〜ナー像が転写された転写用紙15は、分111
を弔電器20の帯電によって感光体ドラム11の表面か
ら分離された後、搬送ベルト21を介して定着器22へ
ど搬送される。この転写用紙15は、定着器22によっ
て1−ナー像が定着され、排出トレイ23上へど排出さ
れる。図中、24(よりリーナーである。
The transfer paper 15 on which the toner images 1 to 1 above have been transferred is 111 minutes
After being separated from the surface of the photoreceptor drum 11 by the charging of the electrifier 20, it is conveyed to the fixing device 22 via the conveyor belt 21. The 1-toner image is fixed on the transfer paper 15 by the fixing device 22, and the transfer paper 15 is discharged onto the discharge tray 23. In the figure, 24 (leaner).

上記現像装置13では、黒色のトナーが使用され、通常
の画像の現像が行なわれ、現像装置14では、赤や青等
のカラートナーが使用され、2色複写等の際に現像が行
なわれる。
The developing device 13 uses black toner to perform normal image development, and the developing device 14 uses color toner such as red or blue to perform development during two-color copying or the like.

第1図はこの発明に係る現像装置の一実施例を示すもの
であり、例えば上記現像装置13及び14の一方又は双
方どして使用されるものである。
FIG. 1 shows an embodiment of a developing device according to the present invention, which is used, for example, as one or both of the developing devices 13 and 14 described above.

図において、25は現像装置を示すものであり、この現
像装置25は、現像剤31を収容するポツパー30を備
えている。このホッパー30の内部には、非磁性−成分
トナーからなる一成分の現像剤31が収容されている。
In the figure, numeral 25 indicates a developing device, and this developing device 25 includes a popper 30 that accommodates a developer 31. Inside the hopper 30, a one-component developer 31 made of non-magnetic component toner is accommodated.

このホッパー30の感光体ドラム11側の開[1部には
、現像剤担持体どしての現像スリーブ32が回転可能に
配設されている。
A developing sleeve 32 serving as a developer carrying member is rotatably disposed in an opening part of the hopper 30 on the photosensitive drum 11 side.

 0 また、上記現像スリーブ32の側方には、現像スリーブ
32の表面に現像剤31を供給するための現像剤供給ロ
ーラ34が回転可能に配置されており、この現像剤供給
ローラ34は、矢印方向に回転することによって、現像
スリーブ32の表面に現像剤31を供給するための・も
のである。
0 Further, a developer supply roller 34 for supplying the developer 31 to the surface of the development sleeve 32 is rotatably arranged on the side of the development sleeve 32, and this developer supply roller 34 is rotated as shown by the arrow. This is for supplying the developer 31 to the surface of the developing sleeve 32 by rotating in the direction.

さらに、上記の如くして現像スリーブ32の表面に供給
された現像剤31は、層厚規制部材35によって摩擦帯
電されるとともに薄層形成される。
Furthermore, the developer 31 supplied to the surface of the developing sleeve 32 as described above is triboelectrically charged by the layer thickness regulating member 35 and is formed into a thin layer.

現像スリーブ32上に層形成された現像剤31(よ、現
像スリーブ32の回転に伴って感光体ドラム11近傍へ
と搬送される。そして、上記現像剤31は、感光体ドラ
ム11と現像スリーブ32との間の現像剤飛翔間隙36
において、現像スリーブ32に印加される直流電圧に交
流電圧を畳重した現像バイアスが形成する交番電界によ
り、現像スリーブ32と感光体ドラム11どの間を往復
飛翔し、感光体ドラム11の表面に前述したように形成
された静電潜像を現像する。
The developer 31 formed in a layer on the developing sleeve 32 is transported to the vicinity of the photosensitive drum 11 as the developing sleeve 32 rotates. Developer flying gap 36 between
At this time, the developing sleeve 32 flies back and forth between the developing sleeve 32 and the photoreceptor drum 11 due to the alternating electric field formed by the developing bias obtained by superimposing the AC voltage on the DC voltage applied to the developing sleeve 32, and the above-mentioned particles are applied to the surface of the photoreceptor drum 11. Develop the electrostatic latent image formed as described above.

ところで、この実施例に係る現像装置は、上記1 の構成に加えて、潜像担持体と現像剤担持体の間の現像
剤飛翔領域下流側近傍に、小さい現像剤飛散防止用電極
を架設し、この現像剤飛散防止用電極に所定のバイアス
電圧を印加するように構成されている。
By the way, the developing device according to this embodiment has, in addition to the above-mentioned configuration 1, a small developer scattering prevention electrode installed near the downstream side of the developer flying region between the latent image carrier and the developer carrier. , is configured to apply a predetermined bias voltage to this developer scattering prevention electrode.

すなわち、感光体ドラム11ど現像スリーブ32との間
の現像剤飛翔間隙36の下流側に(よ、第2図に示すよ
うに、現像剤飛散防止用電極としてのワイヤー電極37
が張設されており、この1ノイヤー電極37には、電源
38によって所定のバイアス電圧が印加されている。上
記ワイヤー電極37に印加される電圧は、現像剤31の
帝電量等を考慮して決められるが、現像剤31がマイナ
スに帯電する1〜ナーからなる場合には、例えば現像ス
リーブ32に印加される直流電圧を−100Vとした場
合、−200V程度に設定される。
That is, on the downstream side of the developer flying gap 36 between the photoreceptor drum 11 and the developing sleeve 32 (as shown in FIG.
A predetermined bias voltage is applied to this one Noyer electrode 37 by a power source 38. The voltage applied to the wire electrode 37 is determined by taking into account the amount of Teiden of the developer 31, etc., but if the developer 31 is composed of negatively charged 1 to ner, for example, the voltage applied to the developing sleeve 32 is determined. When the DC voltage is -100V, it is set to about -200V.

尚、上記電源38は、新たに設(づても勿論良いが、例
えば−次?!電器12や現像スリーブ32に電圧を印加
する電線を孔周しでも良い。
The power source 38 may of course be newly installed, but for example, an electric wire for applying a voltage to the electrical appliance 12 or the developing sleeve 32 may be provided around the hole.

その際、上記ワイヤー電極37と感光体ドラム2 11及び現像スリーブ32との間隙dl及びd2は、感
光体ドラム11と現像スリーブ32との間隙dよりも大
きく設定されており、ワイヤー電極37と感光体ドラム
11及び現像スリーブ32との間で放電が発生づ−るの
を防止している。
At this time, the gaps dl and d2 between the wire electrode 37 and the photoreceptor drum 211 and the developing sleeve 32 are set larger than the gap d between the photoreceptor drum 11 and the developing sleeve 32. This prevents discharge from occurring between the body drum 11 and the developing sleeve 32.

以」二の構成に83いて、この実論例に係る現像装置で
は、次のようにして現像剤の飛散等の発生が防止される
。すなわち、現@装M 25によって感光体トラム11
」二に形成された静電潜像を現像する場合、現像スリー
ブ32の表面に担持された現像剤31が、現像剤飛翔領
域36において飛翔する際に、感光体ドラム110回転
等に伴う空気の流れによって飛翔する現像剤31が現像
装置25の外部に飛散使用とする。
In the developing device according to the above-mentioned second configuration, the occurrence of developer scattering etc. is prevented in the following manner. That is, the photoconductor tram 11 is
When developing the electrostatic latent image formed in step 2, when the developer 31 carried on the surface of the developing sleeve 32 flies in the developer flying region 36, air is generated due to the rotation of the photoreceptor drum 110, etc. The developer 31 that flies due to the flow is scattered to the outside of the developing device 25.

しかし、感光体ドラム11と現像スリーブ32の間の現
像剤飛翔領域36の下流側近傍には、ワイヤー電極37
が張設されており、このワイヤ電極37には、′ji源
38によって現像剤31の指定極性と同極性の所定のバ
イアス電圧が印加されているので、感光体ドラム11ど
現像スリーブ3 32の間の現像剤担持体[36から外部に飛散しようと
する現像剤31は、ワイヤー電極37が作る電界によっ
て反発され、現像スリーブ32側へ戻されるので、現像
剤31ば、現像スリーブ32の回転に伴って現像装置2
5の内部に回収され、現像装置25からの現像剤31の
飛散が根本的に防止される。
However, a wire electrode 37 is located near the downstream side of the developer flying region 36 between the photoreceptor drum 11 and the developing sleeve 32.
A predetermined bias voltage having the same polarity as the designated polarity of the developer 31 is applied to the wire electrode 37 by the 'ji source 38, so that the photosensitive drum 11 and the developing sleeve 332 are The developer 31 that tries to scatter to the outside from the developer carrier [ 36 between them is repelled by the electric field created by the wire electrode 37 and returned to the developing sleeve 32 side. Developing device 2
The developer 31 is collected inside the developing device 25, and scattering of the developer 31 from the developing device 25 is fundamentally prevented.

そのため、現像装置25から飛散した現像剤によって複
写機の内部が汚損されるのを防止できるのは勿論のこと
、現像剤31は、ワイヤー電極37が作る電界による反
発力を受(プで現像装置25内に確実に戻るので、回収
された現像剤が現像装置の一部に堆積して不都合を生じ
ることもない。
Therefore, not only can the interior of the copying machine be prevented from being contaminated by the developer scattered from the developing device 25, but also the developer 31 receives a repulsive force due to the electric field created by the wire electrode 37. Since the developer reliably returns to the inside of the developing device 25, the collected developer does not accumulate on a part of the developing device and cause any inconvenience.

第4図はこの発明に係る現像装置の他の実施例を示ずも
のであり、前記実施例と同一の部分には同一の符号を(
=j bて説明すると、この実施例では、潜像担持体と
現像剤担持体の間の現像剤飛翔領域下流側近傍に、飛翔
でる現像剤を装「9内へ導く気流を発生させる気流発生
部利を架設するように構4 威されている。
FIG. 4 shows another embodiment of the developing device according to the present invention, and the same parts as in the above embodiment are denoted by the same reference numerals (
= j b In this embodiment, the flying developer is placed near the downstream side of the developer flying region between the latent image carrier and the developer carrier, and an airflow generating device is used to generate an airflow that guides the flying developer into the inside of the “9”. The structure is being ordered to construct a bridge.

すなわち、感光体ドラム11と現像スリーブ32との間
の現像剤飛翔間隙36の下流側には、第4図に示すよう
に、断面逆V字形状に規制された気流発生部材40が張
設されでいる。そして、この気流発生部040は、第5
図に示すように、感光体ドラム11と現像スリーブ32
の回転に伴って生じる空気流を部分して、この部分され
た空気流によって現像剤飛翔領域36で発生した散逸現
像剤31を、現像スリーブ32側あるいは感光体ドラム
11側へ戻す作用を及ぼす。
That is, on the downstream side of the developer flying gap 36 between the photosensitive drum 11 and the developing sleeve 32, as shown in FIG. I'm here. This airflow generating section 040 is the fifth
As shown in the figure, the photoreceptor drum 11 and the developing sleeve 32
The air flow generated by the rotation of the developer is divided into parts, and the divided air flow has the effect of returning the scattered developer 31 generated in the developer flying area 36 to the developing sleeve 32 side or the photosensitive drum 11 side.

このように、感光体ドラム11と現像スリーブ32の間
の現像剤飛翔領域36の下流側近傍に、飛翔する現像剤
31を装置内へ導く気流を発生させる気流発生部材40
を架設づるように構成したので、感光体ドラム11と現
像スリーブ32の間の現像剤飛翔領域36から外部に飛
散しようどする現像剤31は、気流発生部材40によっ
て装置25内へ戻され、現像剤31の飛散が根本的に防
止される。
In this way, the airflow generating member 40 generates an airflow that guides the flying developer 31 into the apparatus near the downstream side of the developer flying region 36 between the photoreceptor drum 11 and the developing sleeve 32.
Since the developer 31 that is about to be scattered outside from the developer flying area 36 between the photoreceptor drum 11 and the developing sleeve 32 is returned to the inside of the device 25 by the air flow generating member 40, and the developing agent 31 is The scattering of the agent 31 is fundamentally prevented.

5 その他の構成及び作用は前記実施例と同一であるので、
その説明を省略する。
5 Since the other configurations and functions are the same as those of the above embodiment,
The explanation will be omitted.

第6図はこの発明に係る現像装置のさらに他の実施例を
示すものであり、前記実施例と同一の部分には同一の符
号を何して説明すると、この実施例では、潜像担持体と
現像剤担持体の間の現像剤飛翔領域下流側近傍に、少な
くとも表面が導電性を有し、しかも飛翔する現像剤を装
置内へ導く気流を発生させる気流発生部材を架設すると
ともに、この気流発生部材に所定のバイアス電圧を印加
づるように構成されている。
FIG. 6 shows still another embodiment of the developing device according to the present invention, and the same parts as in the above embodiment are given the same reference numerals. In this embodiment, the latent image carrier is An airflow generating member, which has at least a conductive surface and generates an airflow that guides the flying developer into the device, is installed near the downstream side of the developer flying region between the developer carrier and the developer carrier. It is configured to apply a predetermined bias voltage to the generating member.

すなわち、感光体ドラム11と現像スリーブ32との間
の現像剤飛翔間隙36の下流側には、第7図に示すよう
に、断面逆V字形状に規制された気流発生部材40が張
設されている。そして、この気流発生部IJ40は、第
8図に示すように、感光体ドラム11と現像スリーブ3
2の回転に伴って生じる空気流を部分して、この部分さ
れた空気流によって現像剤飛翔領域36で発生した散逸
現像剤31を、現像スリーブ32側あるいは感光体 6 ドラム11側へ戻す作用を及ぼす。
That is, on the downstream side of the developer flying gap 36 between the photosensitive drum 11 and the developing sleeve 32, as shown in FIG. ing. As shown in FIG.
The air flow generated by the rotation of the drum 2 is divided into parts, and the divided air flow returns the scattered developer 31 generated in the developer flying area 36 to the developing sleeve 32 side or the photoreceptor drum 11 side. affect

また、上記気流発生部材40は、第9図に示すように、
絶縁部材からなる気流発生部材用母料40 aど、その
表面に被覆された導電140bどから構成されており、
この導電層40bには、電源41によって所定のバイア
ス電圧が印加されている。上記気流発生部材40の導電
層40bに印加される電圧は、現像剤31の帝電出等を
考慮して決められるが、現像剤31がマイナスに帯電す
るトナーからなる場合には、例えば−100〜1000
VPi!度に設定される。尚、上記電源38は、新たに
設けても勿論良いが、例えば−次帯電器12や現像スリ
ーブ32に電圧を印加する電源を利用しても良い。
Further, the airflow generating member 40, as shown in FIG.
It is composed of a base material 40a for an airflow generating member made of an insulating member, and a conductive material 140b coated on the surface thereof.
A predetermined bias voltage is applied to this conductive layer 40b by a power source 41. The voltage applied to the conductive layer 40b of the airflow generating member 40 is determined by taking into consideration the teironic current of the developer 31, but when the developer 31 is made of negatively charged toner, for example, -100 ~1000
VPi! set at the same time. Note that the power source 38 may of course be newly provided, but for example, a power source that applies voltage to the -order charger 12 or the developing sleeve 32 may be used.

その際、上記気流発生部U3Oの導電層40bと感光体
ドラム11及び現像スリーブ32どの間隙dl及びd2
は、前記実施例と同様、感光体ドラム11と現像スリー
ブ32との間隙dよりも大きく設定されており、ワイヤ
ー電極37と感光体ドラム11及び現像スリーブ32と
の間で放電が7 発生するのを防止している。
At that time, the gaps dl and d2 between the conductive layer 40b of the airflow generating portion U3O, the photoreceptor drum 11, and the developing sleeve 32 are
As in the embodiment described above, is set larger than the gap d between the photoreceptor drum 11 and the developing sleeve 32, and the discharge occurs between the wire electrode 37 and the photoreceptor drum 11 and the developing sleeve 32. is prevented.

このように、感光体ドラム11ど現像スリーブ32の間
の現像剤飛翔領域36の下流側近傍に、飛翔する現像剤
31を装置内へ導く気流を発生させる気流発生部拐40
を架設するように構成したので、感光体ドラム11ど現
像スリーブ32の間の現像剤飛翔領域36から外部に飛
散しようとする現像剤31は、気流発生部利40によっ
て装置25内へ戻され、現像剤31の飛散が根本的に防
止される。
In this way, the airflow generation section 40 that generates an airflow that guides the flying developer 31 into the apparatus is installed near the downstream side of the developer flying region 36 between the photoreceptor drum 11 and the developing sleeve 32.
Since the developer 31 is constructed such that the developer 31 is scattered outside from the developer flying region 36 between the photoreceptor drum 11 and the developing sleeve 32, it is returned to the inside of the device 25 by the air flow generator 40. The scattering of the developer 31 is fundamentally prevented.

また、この実施例では、上記の作用に加えて、気流発生
部拐40の導電層40bに電源41によって現像剤31
の帯電極性と同極性の所定のバイアス電圧が印加されで
いるので、感光体ドラム11と現像スリーブ32の間の
現像剤飛翔領域36から外部に飛散しようとする現像剤
31は、気流発生部利40の導電層40bが作る電界に
よって反発され、現像スリーブ32側へ戻されるので、
現像剤31は、現像スリーブ32の回転に伴って現像装
@25の内部に回収され、現像装置8 25からの現像剤31の飛散が根本的に防止される。
Further, in this embodiment, in addition to the above-mentioned effect, the developer 31 is applied to the conductive layer 40b of the airflow generating part 40 by the power source 41.
Since a predetermined bias voltage having the same polarity as the charging polarity of Because it is repelled by the electric field created by the conductive layer 40b of 40 and returned to the developing sleeve 32 side,
The developer 31 is collected inside the developing device @25 as the developing sleeve 32 rotates, and scattering of the developer 31 from the developing device 825 is fundamentally prevented.

その他の構成及び作用は前記実施例と同一であるので、
その説明を省略づ−る。
Other configurations and functions are the same as in the previous embodiment, so
The explanation will be omitted.

なお、前記実施例では、現像装置が非磁性−成分現像剤
を用いたジャンピング現像方式を採用した装置について
説明したが、これに限定されるものではなく、磁性−成
分現像方式、二成分磁気ブラシ現像方式を用いた装置に
も同様に適用できることは勿論である。
In the above embodiments, the developing device employs a jumping developing method using a non-magnetic component developer, but is not limited to this, and may include a magnetic component developing method, a two-component magnetic brush, etc. Of course, the present invention can also be applied to an apparatus using a developing method.

[発明の効果] この発明は以上の構成及び作用よりなるもので、請求項
第1項記載の現像装置においては、潜像担持体と現像剤
担持体の間の現像剤飛翔領域下流側近傍に、小ざい現像
剤飛散防止用電極を架設し、この現像剤飛散防止用電極
に所定のバイアス電圧を印加するように構成したので、
潜像担持体ど現像剤担持体の間の現像剤飛翔領域から外
部に飛散じようどする現像剤は、現像剤飛散防止用電極
が作る電界によって反発され、現像装置内へ戻され9 るので、現像剤の飛散を根本的に防止することができる
[Effects of the Invention] The present invention has the above-described configuration and operation, and in the developing device according to claim 1, there is provided a developing device in the vicinity of the downstream side of the developer flying region between the latent image carrier and the developer carrier. , a small developer scattering prevention electrode is installed and a predetermined bias voltage is applied to this developer scattering prevention electrode.
The developer that is about to scatter to the outside from the developer flying area between the latent image carrier and the developer carrier is repelled by the electric field created by the developer scattering prevention electrode and returned to the inside of the developing device. , it is possible to fundamentally prevent developer scattering.

また、この請求項第2項記載の現像装置においては、潜
像担持体ど現像剤担持体の間の現像剤飛翔領域下流側近
傍に、飛翔する現像剤を装置内へ導く気流を発生させる
気流発生部材を架設するように構成したので、潜像担持
体と現像剤担持体の間の現像剤飛翔領域から外部に飛散
しJ:うどづる現像剤は、気流発生部材によって装置内
へ戻され、現像剤の飛散を根本的に防止づることかでき
る。
Further, in the developing device according to claim 2, an air current that generates an air flow that guides the flying developer into the device is provided near the downstream side of the developer flying region between the developer carriers such as the latent image carrier. Since the generation member is constructed to be installed, the developer that scatters to the outside from the developer flying area between the latent image carrier and the developer carrier is returned to the inside of the apparatus by the air flow generation member. It is possible to fundamentally prevent developer scattering.

さらに、この請求項第2項記載の現像装置においては、
潜像担持体と現像剤担持体の間の現像剤飛翔領域下流側
近傍に、少なくとも表面が導電性を有し、しかも飛翔す
る33.!像剤を装置内へ導く気流を発生させる気流発
生部材を架設り−るどともに、この気流発生部材に所定
のバイアス電圧を印加づ゛るように構成したので、潜像
担持体と現像剤担持体の間の現像剤飛翔領域から外部に
飛散しようとする現像剤は、気流発生部材によって装備
内へ戻されるとともに、気流発生部材が作る電界にょっ
0 て反発され、現像装置内へ戻されるので、現像剤の飛散
を根本的に防止することができる。
Furthermore, in the developing device according to claim 2,
33. At least the surface has conductivity near the downstream side of the developer flying region between the latent image carrier and the developer carrier, and the developer flies.33. ! An airflow generating member that generates an airflow that guides the developer into the apparatus is installed, and a predetermined bias voltage is applied to this airflow generating member, so that the latent image carrier and the developer carrying member are connected to each other. The developer that is about to scatter outside from the developer flying area between the bodies is returned into the equipment by the airflow generating member, and is also repelled by the electric field created by the airflow generating member and returned to the inside of the developing device. , it is possible to fundamentally prevent developer scattering.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明に係る現像装置の一実施例を示す構成
図、第2図は同現像器の要部説明図、第3図はこの発明
に係る現像装置を適用し得る電子写真複写機を示す構成
図、第4図はこの発明の他の実流例を示づ要部構成図、
第5図は同実施例の作用を示す説明図、第6図はこの発
明のさらに他の実施例を示づ構成図、第7図は同実施例
の要部構成図、第8図は同実施例の作用を示す説明図、
第9図は気流発生部材を示す断面図、第10図は従来の
現像装置を示す説明図である。 [符5号の説明] 11・・・感光体ドラム 25・・・現像装置 31・・・現像剤 32・・・現像スリーブ 37・・・ワイヤー電極 38・・・バイアス電源 40・・・気流発生部材 特 許 出 願 人  富士ピ1コックス株式会社代 
理 人 弁理士  中相 智廣(外1名)1 2 第4 図 第 図 第 図 第 図 第 8 図 第 図 0a
FIG. 1 is a configuration diagram showing an embodiment of the developing device according to the present invention, FIG. 2 is an explanatory diagram of the main parts of the developing device, and FIG. 3 is an electrophotographic copying machine to which the developing device according to the present invention can be applied. FIG. 4 is a main part configuration diagram showing another example of the actual flow of this invention.
Fig. 5 is an explanatory diagram showing the operation of the same embodiment, Fig. 6 is a block diagram showing still another embodiment of the present invention, Fig. 7 is a block diagram of the main part of the same embodiment, and Fig. 8 is the same. An explanatory diagram showing the effect of the embodiment,
FIG. 9 is a sectional view showing an airflow generating member, and FIG. 10 is an explanatory view showing a conventional developing device. [Explanation of number 5] 11... Photosensitive drum 25... Developing device 31... Developer 32... Developing sleeve 37... Wire electrode 38... Bias power source 40... Air flow generation Parts patent applicant: Fuji Pi1 Cox Co., Ltd.
Attorney Patent Attorney Tomohiro Nakaso (1 other person) 1 2 Figure 4 Figure Figure Figure 8 Figure Figure 0a

Claims (3)

【特許請求の範囲】[Claims] (1)潜像担持体上に形成された静電潜像を、現像剤担
持体の周囲に保持された現像剤を飛翔させて可視像化す
る現像装置において、上記潜像担持体と現像剤担持体の
間の現像剤飛翔領域下流側近傍に、小さい現像剤飛散防
止用電極を架設し、この現像剤飛散防止用電極に所定の
バイアス電圧を印加することを特徴とする現像装置。
(1) In a developing device that visualizes an electrostatic latent image formed on a latent image carrier by flying developer held around the developer carrier, the latent image carrier and the developer A developing device characterized in that a small developer scattering prevention electrode is installed near the downstream side of a developer flying region between agent carriers, and a predetermined bias voltage is applied to this developer scattering prevention electrode.
(2)潜像担持体上に形成された静電潜像を、現像剤担
持体の周囲に保持された現像剤を飛翔させて可視像化す
る現像装置において、上記潜像担持体と現像剤担持体の
間の現像剤飛翔領域下流側近傍に、飛翔する現像剤を装
置内へ導く気流を発生させる気流発生部材を架設するこ
とを特徴とする現像装置。
(2) In a developing device that visualizes an electrostatic latent image formed on a latent image carrier by flying developer held around the developer carrier, the latent image carrier and the developer A developing device characterized in that an airflow generating member for generating an airflow that guides flying developer into the device is installed near the downstream side of a developer flying region between developer carriers.
(3)潜像担持体上に形成された静電潜像を、現像剤担
持体の周囲に保持された現像剤を飛翔させて可視像化す
る現像装置において、上記潜像担持体と現像剤担持体の
間の現像剤飛翔領域下流側近傍に、少なくとも表面が導
電性を有し、しかも飛翔する現像剤を装置内へ導く気流
を発生させる気流発生部材を架設するとともに、この気
流発生部材に所定のバイアス電圧を印加することを特徴
とする現像装置。
(3) In a developing device that visualizes an electrostatic latent image formed on a latent image carrier by flying developer held around the developer carrier, the latent image carrier and the developer An airflow generating member having at least a conductive surface and generating an airflow that guides the flying developer into the device is installed near the downstream side of the developer flying region between the agent carriers, and this airflow generating member A developing device that applies a predetermined bias voltage to.
JP1206843A 1989-08-11 1989-08-11 Developing device Pending JPH0371162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1206843A JPH0371162A (en) 1989-08-11 1989-08-11 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1206843A JPH0371162A (en) 1989-08-11 1989-08-11 Developing device

Publications (1)

Publication Number Publication Date
JPH0371162A true JPH0371162A (en) 1991-03-26

Family

ID=16529979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1206843A Pending JPH0371162A (en) 1989-08-11 1989-08-11 Developing device

Country Status (1)

Country Link
JP (1) JPH0371162A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6381424B1 (en) 1999-10-28 2002-04-30 Fujitsu Limited Toner charge control for image defect reduction
JP2009282241A (en) * 2008-05-21 2009-12-03 Ricoh Co Ltd Developing device, process unit and image forming apparatus

Citations (4)

* Cited by examiner, † Cited by third party
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JPS6095574A (en) * 1983-10-31 1985-05-28 Canon Inc Image forming device
JPS61217081A (en) * 1985-03-22 1986-09-26 Minolta Camera Co Ltd Developing device for electrostatic latent image
JPS61217082A (en) * 1985-03-23 1986-09-26 Minolta Camera Co Ltd Developing device for electrostatic latent image
JPS62244072A (en) * 1986-04-16 1987-10-24 Ricoh Co Ltd Developing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6095574A (en) * 1983-10-31 1985-05-28 Canon Inc Image forming device
JPS61217081A (en) * 1985-03-22 1986-09-26 Minolta Camera Co Ltd Developing device for electrostatic latent image
JPS61217082A (en) * 1985-03-23 1986-09-26 Minolta Camera Co Ltd Developing device for electrostatic latent image
JPS62244072A (en) * 1986-04-16 1987-10-24 Ricoh Co Ltd Developing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6381424B1 (en) 1999-10-28 2002-04-30 Fujitsu Limited Toner charge control for image defect reduction
JP2009282241A (en) * 2008-05-21 2009-12-03 Ricoh Co Ltd Developing device, process unit and image forming apparatus

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