JPS6095574A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPS6095574A JPS6095574A JP58205186A JP20518683A JPS6095574A JP S6095574 A JPS6095574 A JP S6095574A JP 58205186 A JP58205186 A JP 58205186A JP 20518683 A JP20518683 A JP 20518683A JP S6095574 A JPS6095574 A JP S6095574A
- Authority
- JP
- Japan
- Prior art keywords
- latent image
- developer
- holding member
- conductive member
- image holding
- 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.)
- Granted
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing For Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電子写真・静電記録・磁気記録停において潜像
保持部材面に形成した潜像を現像する現像装置を有する
画像形成装置に関する。／１にトナーの薄層を形成保持
した現像剤相持体面を潜像保持部材面に対面（微小な間
隙を存１〜て対向、或いは接触対面）させることによす
、ｉ・ナーを潜像保持部材面側へ潜像バタ・−ンに対応
させて選択的に移行させることにより潜像をトナー現像
する方式の画像形成装置の改善に係る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image forming apparatus having a developing device for developing a latent image formed on the surface of a latent image holding member in electrophotography, electrostatic recording, or magnetic recording. By making the surface of the developer carrier on which a thin layer of toner is formed and held face the surface of the latent image holding member (facing with a minute gap or facing in contact), the i-toner is formed into a latent image. The present invention relates to an improvement in an image forming apparatus in which a latent image is developed with toner by selectively transferring the latent image to the surface of a holding member in correspondence with a latent image pattern.
従来技術
第１図にこの種の画像形成装置ＷＫ於ける現像部分め一
成分磁性トナーを用いた一般的なものの概略構成を示す
（潜像保持部材面とトナー薄層とは非接触の所１１’ｌ
ｌ・ナージャンビング現像タイプの現像器を示す）０
図中１はＩＪＪ、浄剤Ｊｌｌ持体としての非磁性スリー
ブで、矢印ａ方向に回転駆動される。以下核部材１を現
像スリーブ或いは単にスリーブという。２は該スリーブ
１の内空に挿入配設した磁界発生部材たる固定のマグネ
ットロールで、上記現像スリーブ１は該固定のマグネツ
）ｏ−ル２のまわシを回転する。３は現像スリーブ１に
対する現像剤供給手段としてのトナーホッパーで、現像
スリーブ１はこのトナーホッパー３内に略右半周面を入
υ込ませて配設しである。４は現像剤層厚規制部材とし
ての磁性ブレードで、現像スリーブ１の上側路中央部に
於いて下辺を該スリーブ面との間に適当な微小間隙α（
例えば２４０μ）を保たせて接近させて配設しである。Prior Art FIG. 1 shows a general configuration of a typical image forming apparatus WK of this type using a single-component magnetic toner for the developing part (at 11 where the surface of the latent image holding member and the toner thin layer are not in contact with each other). 'l
l・Indicates a developing device of the Nurjanbing developing type) 0
In the figure, reference numeral 1 denotes an IJJ, a non-magnetic sleeve as a cleaning agent Jll holder, which is rotated in the direction of the arrow a. Hereinafter, the core member 1 will be referred to as a developing sleeve or simply a sleeve. Reference numeral 2 denotes a fixed magnet roll which is a magnetic field generating member inserted into the inner space of the sleeve 1, and the developing sleeve 1 rotates the rotation of the fixed magnet roll 2. Reference numeral 3 denotes a toner hopper as a means for supplying developer to the developing sleeve 1, and the developing sleeve 1 is disposed with its approximately right half circumference inserted into the toner hopper 3. Reference numeral 4 denotes a magnetic blade as a developer layer thickness regulating member, which is provided at the center of the upper path of the developing sleeve 1 by creating an appropriate minute gap α (
For example, they are arranged close to each other while maintaining a distance of 240μ).
磁性トナーの層厚は磁性ブレード４と対向する磁極（Ｎ
ｌ）２１によりこの間隙αよりも薄く形成される。５は
ホッパー３内に収容した現像剤たる一成分磁性トナー、
６は現像スリーブ１のホッパー３側と反対側に於いて、
該スリーブ面との間に微小な間隙β（例えば３００μ）
を保って接近通過する潜像保持部材であシ、これは現像
スリーブ１面のａ方向回転移動に対して最近接部におい
て同方向となるｂ方向に回転する。この両部材１・６の
最近接部を便宜上現像部Ａという。The layer thickness of the magnetic toner is determined by the magnetic pole (N
l) 21 is formed to be thinner than this gap α. 5 is a one-component magnetic toner as a developer stored in the hopper 3;
6 is on the side opposite to the hopper 3 side of the developing sleeve 1,
A minute gap β (for example, 300μ) between the sleeve surface and
The latent image holding member approaches and passes by while maintaining the rotational movement of the surface of the developing sleeve 1 in the direction a, and rotates in the direction b which is the same direction at the closest portion to the rotational movement in the direction a. The part closest to these members 1 and 6 is called a developing part A for convenience.
現像スリーブ１の内空に挿入配置１７たマグネットロー
ル２には、磁性ブレード４に対応する上面位置、現像部
Ａに対応する左側面位置、ホッパー３の内底面に対応す
る下面位置、トナー供給部に対応する右側面位１＃ｔに
夫々磁極２１（カット磁極Ｎｌ）、２２（現像磁極８１
）、２３（搬送磁極Ｎ２）、２４（同８２）が配置され
ている。The magnet roll 2 inserted and arranged 17 inside the developing sleeve 1 has an upper surface position corresponding to the magnetic blade 4, a left side position corresponding to the developing section A, a lower surface position corresponding to the inner bottom surface of the hopper 3, and a toner supply section. Magnetic poles 21 (cut magnetic pole Nl) and 22 (developing magnetic pole 81
), 23 (carrier magnetic pole N2), and 24 (carrier magnetic pole N2) are arranged.
潜像保持部材６は、例えばカールソンプロセスによシ靜
電潜像を形成したゼログラフ感光体、特公昭４２−２３
９１（Ｕ公報管にｔｈシ賊のＮＰプロセスにより静電潜
像を形成１．九表面に絶縁層を有する感光体、静電配録
法により潜像を形成した絶縁体、転写法によシ靜電ｍ像
を転写した絶縁体、その他適宜の手法により靜電潜＠（
或いは電位潜像又は磁気潜像）を形成保持させた部材で
ある。The latent image holding member 6 is, for example, a xerographic photoreceptor on which a static latent image is formed by the Carlson process,
91 (Publication U) Forming an electrostatic latent image on a tube using the NP process of th The Seiden m image is transferred onto an insulator, and other appropriate methods are used to create the Seiden image.
Alternatively, it is a member on which a potential latent image or a magnetic latent image is formed and retained.
該部材６の現像部Ａに於ける周速度と現像スリーブ１上
のトナ一層の周速度は岬しくする必要がある。これは特
開和５５−１２００４２号公報に記載の如く、上記両者
の周速度が異なると、現像画像に方向性が現われるので
、現像部Ａに於いては現像スリーブ１の周速度よりその
上に担持されたトナ一層の周速度の方が若子速くなるこ
とを利用して、潜像保持部材６の周速度に比して現像ス
リーブ１０周速度を若干遅くすることによシ方向性によ
る現像画像のムラをなくすためである。The circumferential speed of the member 6 in the developing section A and the circumferential speed of the toner on the developing sleeve 1 need to be steep. This is because, as described in Japanese Unexamined Patent Publication No. 55-120042, if the circumferential speeds of the two are different, directionality appears in the developed image. Taking advantage of the fact that the peripheral speed of one layer of supported toner is faster than the other layer, the peripheral speed of the developing sleeve 10 is made slightly slower than the peripheral speed of the latent image holding member 6, thereby producing a developed image with directionality. This is to eliminate unevenness.
なお、第１図で潜像保持部材６及び現像スリーブ１はそ
れぞれ不図示のギヤにより駆動されている。また、第１
図において、７は現像スリ：−プ１と潜像保持部材６と
の間に交番電界を形成するためのバイアス電源で、交流
、直流を重畳した交流、歪波交流、矩形波、パルス波な
どの交番電圧が供給されその値はピークツウピーク値で
１０００〜２０００Ｖが適当である。このような現像バ
イアスを用いて一例として特公昭５８−１２３７５号又
は同５８−３２３７７号公報に記載の現像方法により現
像を行なうものである。Incidentally, in FIG. 1, the latent image holding member 6 and the developing sleeve 1 are each driven by a gear (not shown). Also, the first
In the figure, 7 is a bias power source for forming an alternating electric field between the developing slip 1 and the latent image holding member 6, and it can be used to generate alternating current, alternating current with superimposed direct current, distorted alternating current, rectangular wave, pulse wave, etc. An alternating voltage of 1,000 to 2,000 V is supplied peak-to-peak. Using such a developing bias, development is carried out by the developing method described in, for example, Japanese Patent Publication No. 58-12375 or No. 58-32377.
従来は現像部Ａでの微小間隙βにバイアス電圧が印加さ
れると、現像スリーブ】十に薄層にコートされたトナー
Ｔがスリーブと潜像保持部材との間を飛翔し、潜像保持
部材６の表面電位に応じて現像される。この飛翔の際に
、極く一部のトナーが重力、潜像保持部材６の回転に伴
う層流等によって現像部Ａ部分でスリーブよシ離れ、潜
像保持体６にも現像スリーブ１にも付着せず、飛散トナ
ーとなって画像形成装置内の帯電器等の器具を汚すこと
があった。この飛散トナーが光学機器又は帯電器に付着
するど、潜像保持部材６上の表面電位が乱れ、コピー画
像上に白筋や黒筋、黒点等を生じる問題が生じた。Conventionally, when a bias voltage is applied to the minute gap β in the developing section A, the toner T coated in a thin layer on the developing sleeve flies between the sleeve and the latent image holding member, and the latent image holding member It is developed according to the surface potential of No. 6. During this flight, a small portion of the toner is separated from the sleeve at the developing section A due to gravity, laminar flow due to the rotation of the latent image holding member 6, etc. The toner does not stick and becomes scattered toner, which sometimes contaminates equipment such as a charger in the image forming apparatus. When this scattered toner adheres to an optical device or a charger, the surface potential on the latent image holding member 6 is disturbed, causing problems such as white streaks, black streaks, and black spots on the copied image.
さらに、飛散トナーがコピー用紙搬送路上に落下した場
合にはコピー用紙を汚す等の欠点があった。Furthermore, if the scattered toner falls onto the copy paper conveyance path, the copy paper may be stained.
発明の目的
本発明は、上述の従来例での現像部よりの現像剤の飛散
を抑制することによって、光学系。OBJECTS OF THE INVENTION The present invention provides an optical system by suppressing the scattering of developer from the developing section in the conventional example described above.
帯電系、搬送系の汚れを防ぎ、長期にわたって安定した
画像を形成することを可能とする画像形成装置の提供を
目的とするものである。The object of the present invention is to provide an image forming apparatus that prevents staining of a charging system and a transport system and that makes it possible to form stable images over a long period of time.
発明の構成
本発明は、潜像保持部材に対向して現像剤担持体を配置
し、この現像剤担持体に交互バイアス電圧を印加して現
像を行なう現像装置を有する画像形成装置において、現
像部よりも潜像保持部材の移動方向下流側に導電部材を
設け、上記交互バイアス電圧を整流して現像剤の保持電
荷と同極性の電圧を上記導電部材に印加し、飛散しよう
とする現像剤を潜像保持部材に付着させ、画像形成装置
内の器具の汚染を防止するものである。従って本発明に
よれば、現像剤の飛散を防止できると共に、飛散防止用
の導電部材に電圧を印加するための特別の電源を必要と
せず、長期間にわたって安定した画像形成を行なうこと
ができる。SUMMARY OF THE INVENTION The present invention provides an image forming apparatus including a developing device in which a developer carrier is disposed opposite to a latent image holding member and a bias voltage is alternately applied to the developer carrier to perform development. A conductive member is provided downstream in the direction of movement of the latent image holding member, and the alternating bias voltage is rectified to apply a voltage having the same polarity as the charge held by the developer to the conductive member, thereby eliminating the developer that is about to scatter. It is attached to the latent image holding member to prevent contamination of instruments within the image forming apparatus. Therefore, according to the present invention, it is possible to prevent the developer from scattering, and to perform stable image formation over a long period of time without requiring a special power source for applying voltage to the conductive member for preventing scattering.
実施例
第２図は本発明による画像形成装置の現像装置部の概略
断面図である。図中８は導電部材で、現像部Ａの下流側
のホッパ−３端部に潜像保持部材６に対向して設けられ
ている。９は導電部材８に潜像保持部材の表面電位とθ
、逆極性即ちトナーの電荷と同極性の電圧を印加する電
源であシ、交互現像バイアス電源７からの電圧を整流す
る回路を有している。第１図と同じ作用を為す部材には
同一の参照符号を付しである。Embodiment FIG. 2 is a schematic sectional view of a developing device section of an image forming apparatus according to the present invention. Reference numeral 8 in the figure denotes a conductive member, which is provided at the end of the hopper 3 on the downstream side of the developing section A, facing the latent image holding member 6. 9 is the surface potential of the latent image holding member and θ on the conductive member 8.
, a power supply that applies a voltage of opposite polarity, that is, the same polarity as the charge of the toner, and has a circuit that rectifies the voltage from the alternate development bias power supply 7. Components that perform the same functions as in FIG. 1 are given the same reference numerals.
現像部Ａにおいて生じた飛散トナーは、重力及び潜像保
持部材６である感光ドラノ、の回転に伴なう風等の影響
を受けて、導電部材と潜像保持部材との間隙に飛来した
ときに、両者間の電界によって潜像保持部材に付着１〜
、現像装置外へ飛散していくトナーは著しく減少する。When the scattered toner generated in the developing section A flies into the gap between the conductive member and the latent image holding member under the influence of gravity and the wind accompanying the rotation of the photosensitive drum, which is the latent image holding member 6. Then, the electric field between the two causes the particles to adhere to the latent image holding member.
, the amount of toner flying out of the developing device is significantly reduced.
第２図の実施例では一成分磁性トナーを用いたが、一般
に現像時のトナーの飛散は現像磁極を用いることが可能
な磁性）・ツー−よりも、磁気拘束力を利用できない非
磁性）・ナーを用いた場合の方が飛散量が増える。従っ
て非磁性）・ナーを用いる現像装置の場合に本発明の効
果は大となる。第３図は現像剤として非磁性ｉ・ナーを
用いる場合の本発明の実施例である０
第３図は、本発明を適用した現像装置の断面図である□
第３図において、潜像保持部材である感光体６は、矢印
方向ａに移動する。この感光体６に対して間隙を介して
現像剤を保持する非磁性の現像剤担持体１が設けられ、
本実施例においてはこの担持体１は円筒状であるが、無
端移動するウェブ状としても良い。感光体６についても
同様である。この感光体６の移動とともに現像剤担持体
１を矢印す方向に回転移動させる○この現像剤担持体１
に非磁性トナーを供給するために磁性粒子１４と非磁性
トナー１５を保有する現像容器１０が設けられている０
現像容器１０はその下部近傍に開口を有し、該開口部に
現像剤担持体１が設けられている。現像剤担持体１は開
口から一部が外部に露出しているので、その表面は現像
容器１０の内部から同外部へ移動し、つづいて同内部へ
戻る。現像容器１０の下部は現像剤担持体１の下方を包
うように包囲体が形成されておシ、現像剤が外部に漏れ
ないようになっている。現像剤相持体１の内部には固定
磁界を発生する固定磁界発生手段、すなわち、磁石１１
が固定的に設けられている。In the embodiment shown in Fig. 2, a one-component magnetic toner was used, but in general, toner scattering during development is more likely to be caused by non-magnetic toner, which cannot utilize magnetic binding force, than by magnetic toner, which can use a developing magnetic pole. The amount of scattering increases when a spray gun is used. Therefore, in the case of a developing device using a non-magnetic (non-magnetic) toner, the effects of the present invention will be greater. Figure 3 shows an embodiment of the present invention in which a non-magnetic i-toner is used as the developer.0 Figure 3 is a cross-sectional view of a developing device to which the present invention is applied.
In FIG. 3, the photoreceptor 6, which is a latent image holding member, moves in the direction of the arrow a. A non-magnetic developer carrier 1 that holds developer is provided with a gap between the photoconductor 6 and
In this embodiment, the carrier 1 has a cylindrical shape, but it may also have a web shape that moves endlessly. The same applies to the photoreceptor 6. Along with the movement of this photoreceptor 6, the developer carrier 1 is rotated in the direction indicated by the arrow ○This developer carrier 1
A developer container 10 holding magnetic particles 14 and non-magnetic toner 15 is provided to supply non-magnetic toner to the developer.
The developer container 10 has an opening near its lower part, and the developer carrier 1 is provided in the opening. Since a portion of the developer carrier 1 is exposed to the outside through the opening, its surface moves from the inside of the developer container 10 to the outside, and then returns to the inside. An enclosure is formed at the lower part of the developer container 10 so as to wrap around the lower part of the developer carrier 1 to prevent the developer from leaking to the outside. A fixed magnetic field generating means for generating a fixed magnetic field, that is, a magnet 11 is provided inside the developer carrier 1.
is fixedly provided.
したがって、現像剤担持体１のみが回転する。Therefore, only the developer carrier 1 rotates.
この磁石１１はＮ極、Ｓ極の磁極を有する。This magnet 11 has magnetic poles of an N pole and an S pole.
現像剤担持体１の表面には磁性粒子１４あるいは磁性粒
子と非磁性現像剤（トナー）１５を含む混合体からなる
磁性粒子層が形成されておシ、更にその上部には非磁性
現像剤１５０層が形成され、両者で上下２層構成となっ
ている。A magnetic particle layer consisting of magnetic particles 14 or a mixture containing magnetic particles and non-magnetic developer (toner) 15 is formed on the surface of the developer carrier 1, and furthermore, a non-magnetic developer 150 is formed on the surface of the developer carrier 1. A layer is formed, and both have a two-layer structure, upper and lower.
１２は磁性粒子拘束部材である磁性体からなる磁性ブレ
ードであシ、現像剤相持体１を１）方向に回転させると
、磁性粒子１４は磁性ブレード１２により現像容器１０
内に拘束され、非磁性現像剤１５のみが現像剤相持体１
上に薄く均一に塗布される。磁性ブレード１２は鉄板を
曲げ加工によ多形成し、現像容器１０に固着したもので
ある。この磁性ブレード１２の先端と現像剤相持体１と
の間隔は１００〜１０００μ、好ましくは２００〜５０
０μで、この実施例では２５０μである。この間隔が１
００μよレボさいと、磁性粒子が詰ま）、ブレード外部
へ押し出される欠点がある。また１０００μより大きい
と、振動で非磁性トナーが多量に漏れ出して、薄層が形
成できなくなる。A magnetic blade 12 is made of a magnetic material and serves as a magnetic particle restraining member. When the developer carrier 1 is rotated in the direction 1), the magnetic particles 14 are moved to the developer container 10 by the magnetic blade 12.
Only the non-magnetic developer 15 is confined within the developer carrier 1.
It is applied thinly and evenly on top. The magnetic blade 12 is formed by bending an iron plate and fixed to the developer container 10. The distance between the tip of the magnetic blade 12 and the developer carrier 1 is 100 to 1000 μm, preferably 200 to 50 μm.
0μ, and in this example it is 250μ. This interval is 1
If the blade is larger than 00μ, it has the disadvantage that the magnetic particles become clogged and are pushed out to the outside of the blade. If it is larger than 1000μ, a large amount of non-magnetic toner will leak out due to vibration, making it impossible to form a thin layer.
尚、□この非磁性現像のみを現像剤担持体１上に薄く塗
布する方法に関しては、本出願人による特願昭５８−１
５１０２８号に詳しく述べられているので、詳細な説明
は省略する。□The method of thinly applying only this non-magnetic developer onto the developer carrier 1 is described in Japanese Patent Application No. 58-1 filed by the present applicant.
Since it is described in detail in No. 51028, detailed explanation will be omitted.
磁性ブレード１２の上部には非磁性材料よシ成る磁性粒
子循環域限定部材１３が設置され、磁性粒子の磁性ブレ
ード上への盛り上がシをなくシ、不要な循環により磁性
粒子が磁性ブレード部よシ漏れて現像容器内の磁性粒子
量が減少するのを防止している。また、現像容器１０の
下部には、磁石１１のＮ極に対向して、Ｌ字形の磁性板
１６が設置されている。この磁性板１６は現像剤担持体
１との間に磁性粒子による磁気ブラシを形成し、現像容
器からの磁性粒子ないしは非磁性現像剤の漏出を防止す
る磁性シールの役目を果している。さらに、現像界器１
ｏ］；部には、現像剤担持体１の移動方向に対１〜で、
上記磁性シール用の磁性板１６よりも１瀝側に、現像剤
捕集部１７が設けられている。この現像剤捕集部１７は
磁性板１６と現像剤相持体上との間から飛散した現像剤
、ないしれ１．現像後に現像剤相持体上から離脱１〜た
現像剤表とを捕集する０
また、現像容器１０の下部先端には本発明による現像剤
飛散防止用の導電部材８が感光体６に近接して設けられ
ている。この導電部材８には使用する非磁性現像剤の帯
？！極性と同極性の電圧が印加され、主として現像工程
で発生した浮遊現像剤を感光体側に付着させることによ
って現像容器外への現像剤飛散を防止（２ている。A magnetic particle circulation area limiting member 13 made of a non-magnetic material is installed on the upper part of the magnetic blade 12 to prevent the magnetic particles from rising on the magnetic blade and to prevent the magnetic particles from flowing into the magnetic blade section due to unnecessary circulation. This prevents the amount of magnetic particles in the developer container from decreasing due to leakage. Furthermore, an L-shaped magnetic plate 16 is installed at the bottom of the developer container 10, facing the north pole of the magnet 11. This magnetic plate 16 forms a magnetic brush of magnetic particles between it and the developer carrier 1, and serves as a magnetic seal to prevent leakage of magnetic particles or non-magnetic developer from the developer container. Furthermore, the developing device 1
o]; part is 1 to 1 in the moving direction of the developer carrier 1,
A developer collecting section 17 is provided one side further than the magnetic plate 16 for the magnetic seal. This developer collecting section 17 collects developer scattered from between the magnetic plate 16 and the developer carrier. In addition, a conductive member 8 for preventing developer scattering according to the present invention is provided near the photoreceptor 6 at the lower end of the developer container 10 to collect the developer separated from the developer carrier after development. It is provided. Is this conductive member 8 a band of non-magnetic developer to be used? ! A voltage of the same polarity is applied, and the floating developer mainly generated during the development process is caused to adhere to the photoreceptor side, thereby preventing the developer from scattering outside the developer container (2).
図中７は現像バイアス電源で、現像Ａｌｌ相持体に印加
される交互バイアス電圧を供給する。又、９は現像バイ
アス電源７からの交互電圧を整流して、上記現像剤飛散
防止用の導電部祠に電圧を印加するだめの電源で、との
実施例では非磁性現像剤の帯電極性と同極性となる向き
に整流回路素子（ダイオード）示挿入されている。In the figure, reference numeral 7 denotes a developing bias power supply, which supplies an alternating bias voltage to be applied to the developing All-supporting member. Further, 9 is a power source for rectifying the alternating voltage from the developing bias power source 7 and applying a voltage to the conductive part shrine for preventing scattering of the developer, and in this embodiment, the voltage is applied to the conductive part for preventing scattering of the developer. Rectifier circuit elements (diodes) are inserted with the same polarity.
導電部材８は磁性体でも良いが現像装置の磁界を乱さぬ
様に非磁性体の方が好ましく、本実施例では厚さｔ＝０
．６ｍｍ、幅６ ’１１１１１ ％長さ２１０ｍの銅板
を潜像保持部材６に対して間隔０．８＋ｍで対向して配
置した。交互挑像バイアス電源７として周波数１．６
ＫＨ２ｒ ピーク対ピーク値１．３ｋＶｐｐの正弦波交
流に一３００ｖめＤＣ成分を重畳したものを用い、導電
部□材８用の電源９として日立■製ＹＩＯＥＡ高耐圧・
ダイオードを用いて整流したところ、Ｖｉｉ＝ ＋２’
５０Ｖ％ Ｖｔ＝ ＋１３０Ｖ １７）半波電流を得、
これを導電部材８に印加したところ、現像剤の飛散量は
電圧を印加しないものに較べて１／２〜１４に軽減す名
ことができた。尚、図中８ａは絶縁体からなるシートで
、現像容器から磁性粒子が微量漏出した場合に、磁性粒
子が導電部材８と現像剤担持体１との間で絶縁不良を起
こすことを防止してふる。The conductive member 8 may be made of a magnetic material, but is preferably made of a non-magnetic material so as not to disturb the magnetic field of the developing device, and in this embodiment, the thickness t=0.
．． A copper plate having a width of 6 mm, a width of 6'11111% and a length of 210 m was placed facing the latent image holding member 6 at a distance of 0.8+ m. Frequency 1.6 as alternating challenge bias power supply 7
KH2r Using a sine wave alternating current with a peak-to-peak value of 1.3 kVpp and a DC component of 1300 V superimposed, the power source 9 for the conductive part □ material 8 was a YIOEA high voltage withstand voltage manufactured by Hitachi ■.
When rectified using a diode, Vii= +2'
50V% Vt= +130V 17) Obtain half wave current,
When this voltage was applied to the conductive member 8, the amount of developer scattering was reduced to 1/2 to 14 times compared to when no voltage was applied. In addition, 8a in the figure is a sheet made of an insulator, which prevents the magnetic particles from causing insulation failure between the conductive member 8 and the developer carrier 1 when a small amount of magnetic particles leaks from the developer container. Furu.
上述の実施例においては導電板部材８には現像バイアス
電源７よ＃）１個のダイオードによって整流された電流
を印加したが、現像バイアスとしてＡＣを用い、さらに
トナーと逆極性のＩ）Ｃ分を重畳したものを用いた場合
にり１、充分な電圧が得られない場合がある。これ目、
現像濃度調整を現像バイアスのＤＣ成分を変化させて行
なうタイプの現偉器においては、ＤＣ成分の値によって
は飛散するトナー址が多くなる恐れがあるからである。In the above embodiment, a current rectified by one diode such as the developing bias power source 7 was applied to the conductive plate member 8, but AC was used as the developing bias, and an I) C component of opposite polarity to the toner was applied. If a superimposed voltage is used, sufficient voltage may not be obtained. This is the second one
This is because in a type of developing device in which the development density is adjusted by changing the DC component of the development bias, there is a risk that a large amount of toner will be scattered depending on the value of the DC component.
そこでＤＣ成分の値によらず一定の電圧を印加する回路
を第４図に示す。ｐＡ４図は現像装置を模式的に描いた
もので、第３図と同一の部材には同一の参照符号を示す
。図中１８はダイオードで、現像バイアス電源７とダイ
オード１８の間に１００ｐＦ程度のコンデンサー１９を
挿入するととによって、ＤＣ成分をカットすることがで
き、一定の電圧が導電部材８に加わり、安定した飛散防
止効果を得ることができた。Therefore, a circuit for applying a constant voltage regardless of the value of the DC component is shown in FIG. Figure pA4 schematically depicts the developing device, and the same members as in Figure 3 are designated by the same reference numerals. In the figure, 18 is a diode, and by inserting a capacitor 19 of about 100 pF between the developing bias power supply 7 and the diode 18, the DC component can be cut, and a constant voltage is applied to the conductive member 8, resulting in stable scattering. We were able to obtain a preventive effect.
□第４図の実施例において安定して得られた効果を更に
高めるために、第５図に示す様に、ダイオード２０を更
ｌｌ？：１個加えて、倍電圧整流回路を形成すると、■
□＝１２００Ｖ、Ｖ、＝９００Ｖの半波電流を得ること
ができ、これを導電部材８に印加すると、現像剤飛散量
は倍電圧整流回路を形成しないものに対して１７２〜”
／２０位に安定して軽減することができた。本実施例及
び第３図、第４図の実施例では整流した電圧をそのまま
導電部材に印加したが、平滑回路を通して完全な直流電
源にして印加することも好ましい。□In order to further enhance the effect stably obtained in the embodiment of FIG. 4, the diode 20 is added as shown in FIG. : Add one piece to form a voltage doubler rectifier circuit, ■
A half-wave current of □ = 1200V, V, = 900V can be obtained, and when this is applied to the conductive member 8, the amount of developer scattering is 172~ compared to the one that does not form a voltage doubler rectifier circuit.
We were able to stably reduce it to 20th place. In this embodiment and the embodiments shown in FIGS. 3 and 4, the rectified voltage is directly applied to the conductive member, but it is also preferable to apply it as a complete DC power source through a smoothing circuit.
更に感光ドラムを傷つけない範囲で３倍電圧整流等の多
倍電圧整流回路を形成してもよい。Furthermore, a multiple voltage rectification circuit such as a triple voltage rectification circuit may be formed within a range that does not damage the photosensitive drum.
導電部材８として厚さｔ＝１．０■、幅６ｍ。The conductive member 8 has a thickness t of 1.0 mm and a width of 6 m.
長さ２１０−の真鍮板を潜像保持部材６に対して間隔１
．２ｍで対向して配置し、第５図に示しだ倍電圧整流回
路による電源９で得た半波電流を平滑回路を通して完全
な直流として導電部材８に印加した。この直流を一４０
０Ｖ〜＋４００Ｖの範囲で変化させ、現像器下方に図示
していない紙を置き、画像率６％の原稿を５００枚通紙
した時の上記紙上に飛散したトナー量をマクベス反射濃
度計上測定したところ第６図の様な結果を得た。その結
果、導電部拐に＋１（ＩＯＶ以上の電圧を印加すると飛
散は少なくなり、−１−２００Ｖ以上の電圧を加えた場
合には飛散−′が１」立って減少していることが明らか
になった。従って本発明では＋１００以上好ましくは＋
２ （ｌ ＯＶ以上のトナーと同極性の電圧を導電部拐
に印加するのが好ましい。また、＋１００ＶμｍＬ印加
した場合には導電部材へのトナーの付着は殆んどなく、
−１００Ｖ以上印加した場合、即ちトナーと逆極の場合
には導電部材はほぼトナーにおおゎれていることが認め
られた。A brass plate having a length of 210 mm is placed at a distance of 1 from the latent image holding member 6.
．． They were placed facing each other at a distance of 2 m, and a half-wave current obtained from a power source 9 using a voltage doubler rectifier circuit as shown in FIG. 5 was applied to the conductive member 8 as a complete direct current through a smoothing circuit. This DC is -40
The amount of toner scattered on the paper was measured using a Macbeth reflection densitometer when 500 sheets of original with an image rate of 6% were passed through a sheet of paper (not shown) placed below the developing device while changing the voltage in the range of 0V to +400V. The results shown in Figure 6 were obtained. As a result, it is clear that when a voltage of +1 (IOV or higher) is applied to the conductive part, the scattering decreases, and when a voltage of -1-200V or higher is applied, the scattering -' decreases by 1''. Therefore, in the present invention, +100 or more preferably +
It is preferable to apply a voltage of the same polarity as the toner of 2 (l OV or higher) to the conductive member.Also, when +100VμmL is applied, there is almost no toner adhesion to the conductive member.
When -100V or more was applied, that is, when the polarity was opposite to that of the toner, it was observed that the conductive member was almost covered with toner.
尚、本発明において反転現像を行なう際にも導電部材に
トナーと同極性の電圧を印加することにより、トナーの
飛散を防雨することができる。また、本発明の詳細な説
明に当っては現像装置のホッパー又は現偉容器の下方端
部に導電部材を設ける例を示したが、この導電部材は現
像装置とは別体に、例えば画像装置Ｎ−に取シ付けるよ
うに構成してもよい。In the present invention, even when performing reverse development, by applying a voltage of the same polarity as the toner to the conductive member, it is possible to prevent toner from scattering. Further, in the detailed explanation of the present invention, an example in which a conductive member is provided at the lower end of the hopper or developer container of the developing device is shown, but this conductive member is provided separately from the developing device, for example, in the image device. It may be configured to be attached to N-.
尚、実開昭５８−１００３４５号には電極板にトナーと
同極性の電圧を印加する例が示されているが、本発明で
は交互現像バイアス電源から整流回路を通して導電部材
に電圧を印加するので、導電部材用の独立した電源を必
要とせず、画像形成装置を小型化し、安価に形成できる
利点がある。Incidentally, Utility Model Application No. 58-100345 shows an example in which a voltage of the same polarity as that of the toner is applied to an electrode plate, but in the present invention, voltage is applied to a conductive member from an alternate development bias power source through a rectifier circuit. , there is an advantage that an independent power source for the conductive member is not required, and the image forming apparatus can be made smaller and manufactured at a lower cost.
本発明の詳細な説明に当っては、現像剤を潜像保持部材
に非接触に保ち、ジャンピング現像を行なわせる現像装
置を例にとって説明したが、現像剤担持体上の現像剤を
潜像保持体に接触させて現像を行なう装置にも本発明は
適用できるものである。In the detailed explanation of the present invention, a developing device that maintains the developer in a non-contact manner with the latent image holding member and performs jumping development was explained as an example. The present invention can also be applied to an apparatus that performs development by contacting the body.
発明の詳細
な説明したように、本発明では現像部よシも下流側に潜
像保持部材に対向させて導電部材を設け、交互現像バイ
アス電圧を整流して該導電部材に現像剤の電荷と同極性
の電圧を加えるようにしたから、飛散する現像剤量を大
幅に軽減することが可能になシ、画像形成装置内の汚れ
が少なくなって長期にわたって光学系や帯電系が汚れず
、従って安定した良好な画像を得る効果がある。また導
電部材に電圧を印加するための電源を別個に設ける必要
がないので、装置を小型に安価に形成できる利点がある
。As described in detail, in the present invention, a conductive member is provided on the downstream side of the developing section facing the latent image holding member, and the alternating developing bias voltage is rectified to cause the electric charge of the developer and the conductive member to be connected to the conductive member. By applying voltages of the same polarity, it is possible to significantly reduce the amount of developer that scatters, and the amount of dirt inside the image forming apparatus is reduced, preventing the optical system and charging system from becoming dirty over a long period of time. This has the effect of obtaining stable and good images. Further, since there is no need to separately provide a power source for applying a voltage to the conductive member, there is an advantage that the device can be made small and inexpensive.
第１図は従来の現像装置の断面図、第２図は本発明の実
施例を示す現像装置の断面図、第３図は不発明の他の実
施例を示す断面図、第４図及び第５図は本発明の他の実
施例を示す模式図、第６図は現像剤の飛散量を示すグラ
フである。
１・−・・−・現像剤担持体、２・１１・−・−・磁石
、４・１２−・・−磁性ブレード、５・−・−磁性トナ
ー、６−潜像保持部材、７−・−・交互現像バイアス電
源、８・・・・−・導電部材、９・−・−・整流回路、
を表わす。FIG. 1 is a sectional view of a conventional developing device, FIG. 2 is a sectional view of a developing device showing an embodiment of the present invention, FIG. 3 is a sectional view showing another embodiment of the invention, and FIGS. FIG. 5 is a schematic diagram showing another embodiment of the present invention, and FIG. 6 is a graph showing the amount of developer scattered. 1.--Developer carrier, 2.11-.-Magnet, 4.12-.-Magnetic blade, 5.--Magnetic toner, 6-Latent image holding member, 7-. −・Alternate development bias power supply, 8・・・・−・Conductive member, 9・−・−・Rectifier circuit,
represents.
Claims (3)
この現像剤担持体に交互バイアス電圧を印加して現像を
行なう現像装置を有する画像形成装置において、現像部
よりも潜像保持部材の移動方向下流側に導電部材を設け
、上記交互バイアス電圧を整流して現像剤の保持電荷と
同極性の電圧を上記導電部材に印加することを特徴とす
る画像形成装置。(1) Arranging a developer carrier facing the latent image holding member,
In an image forming apparatus having a developing device that performs development by applying alternating bias voltages to the developer carrier, a conductive member is provided downstream of the developing section in the moving direction of the latent image holding member to rectify the alternating bias voltages. and applying a voltage having the same polarity as the charge held by the developer to the conductive member.
ていることを特徴とする特許請求の範囲第１項記載の画
像形成装置。(2) The image forming apparatus according to claim 1, wherein the conductive member is attached to an outlet portion of a developing device.
で被覆されていることを特徴とする特許請求の範囲第１
項又は第２項に記載の画像形成装置。(3) Claim 1, characterized in that the side of the conductive member facing the developer carrier is coated with an insulator.
The image forming apparatus according to item 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58205186A JPS6095574A (en) | 1983-10-31 | 1983-10-31 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58205186A JPS6095574A (en) | 1983-10-31 | 1983-10-31 | Image forming device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4293012A Division JPH05249823A (en) | 1992-10-30 | 1992-10-30 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6095574A true JPS6095574A (en) | 1985-05-28 |
| JPH0527864B2 JPH0527864B2 (en) | 1993-04-22 |
Family
ID=16502831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58205186A Granted JPS6095574A (en) | 1983-10-31 | 1983-10-31 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6095574A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6275683A (en) * | 1985-09-30 | 1987-04-07 | Canon Inc | Developing device |
| JPS6281674A (en) * | 1985-10-04 | 1987-04-15 | Konishiroku Photo Ind Co Ltd | Image forming device |
| JPS6396678A (en) * | 1986-10-13 | 1988-04-27 | Matsushita Electric Ind Co Ltd | Image forming device |
| JPH0258252U (en) * | 1988-10-18 | 1990-04-26 | ||
| JPH0371162A (en) * | 1989-08-11 | 1991-03-26 | Fuji Xerox Co Ltd | Developing device |
| JPH07160087A (en) * | 1994-07-11 | 1995-06-23 | Konica Corp | Multicolored image forming device |
| US5581336A (en) * | 1993-12-17 | 1996-12-03 | Canon Kabushiki Kaisha | Developing device preventing scattering of developing agent by conductive member |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55118048A (en) * | 1979-03-05 | 1980-09-10 | Canon Inc | Method and apparatus for developing |
| JPS5816269A (en) * | 1981-07-22 | 1983-01-29 | Fuji Xerox Co Ltd | Developing device of electronic copying machine |
| JPS5821771A (en) * | 1981-08-01 | 1983-02-08 | Konishiroku Photo Ind Co Ltd | Developing device for electrostatic latent image |
| JPS58160964A (en) * | 1982-03-19 | 1983-09-24 | Fuji Xerox Co Ltd | Developing device of electrophotographic copying machine |
-
1983
- 1983-10-31 JP JP58205186A patent/JPS6095574A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55118048A (en) * | 1979-03-05 | 1980-09-10 | Canon Inc | Method and apparatus for developing |
| JPS5816269A (en) * | 1981-07-22 | 1983-01-29 | Fuji Xerox Co Ltd | Developing device of electronic copying machine |
| JPS5821771A (en) * | 1981-08-01 | 1983-02-08 | Konishiroku Photo Ind Co Ltd | Developing device for electrostatic latent image |
| JPS58160964A (en) * | 1982-03-19 | 1983-09-24 | Fuji Xerox Co Ltd | Developing device of electrophotographic copying machine |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6275683A (en) * | 1985-09-30 | 1987-04-07 | Canon Inc | Developing device |
| JPS6281674A (en) * | 1985-10-04 | 1987-04-15 | Konishiroku Photo Ind Co Ltd | Image forming device |
| JPS6396678A (en) * | 1986-10-13 | 1988-04-27 | Matsushita Electric Ind Co Ltd | Image forming device |
| JPH0258252U (en) * | 1988-10-18 | 1990-04-26 | ||
| JPH0371162A (en) * | 1989-08-11 | 1991-03-26 | Fuji Xerox Co Ltd | Developing device |
| US5581336A (en) * | 1993-12-17 | 1996-12-03 | Canon Kabushiki Kaisha | Developing device preventing scattering of developing agent by conductive member |
| JPH07160087A (en) * | 1994-07-11 | 1995-06-23 | Konica Corp | Multicolored image forming device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0527864B2 (en) | 1993-04-22 |
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