JPS62138879A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPS62138879A JPS62138879A JP27872085A JP27872085A JPS62138879A JP S62138879 A JPS62138879 A JP S62138879A JP 27872085 A JP27872085 A JP 27872085A JP 27872085 A JP27872085 A JP 27872085A JP S62138879 A JPS62138879 A JP S62138879A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- magnetic
- magnetic field
- carrying member
- developing sleeve
- 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
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
イ、発明の目的
〔産業上の利用分野〕
本発明は、潜像担持体面上の潜像を乾式現像剤により現
像する現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention [Field of Industrial Application] The present invention relates to a developing device that develops a latent image on the surface of a latent image carrier using a dry developer.
更に詳しくは、現像装置内における現像剤の撹拌・搬送
・規制・循環構成に関するものである。More specifically, the present invention relates to the agitation, conveyance, regulation, and circulation structure of the developer within the developing device.
従来、静電潜像・電位潜像等の電気的潜像の乾式現像手
法・装置としては各種の方式のものが提案され、又実用
化されているが、何れも一長一短を有する。Conventionally, various types of dry developing methods and devices for electrical latent images such as electrostatic latent images and potential latent images have been proposed and put into practical use, but each has advantages and disadvantages.
例えば、２成分系現像剤を用いた現像方法では現像ロー
ラ上に塗布された該現像剤によって潜像の画像部を現像
する場合、現像剤中のトナーは現像ローラ上に塗布され
た現像剤のうちの数パーセント以下しか使用していない
。このことは現像器構成から考慮して非常に効率の悪い
ものである。For example, in a developing method using a two-component developer, when an image area of a latent image is developed with the developer coated on the developing roller, the toner in the developer is mixed with the developer coated on the developing roller. I only use a few percent of it. This is extremely inefficient considering the structure of the developing device.
なぜならば所定の十分な現像濃度を得るために多量の現
像剤を現像ローラの回転毎に現像ローラ上に一定量かつ
トナー濃度を均一にして塗４１する必要があるためであ
る。このため現像器構成は大型化・複雑化していた。This is because, in order to obtain a predetermined and sufficient development density, it is necessary to apply a large amount of developer 41 to the developing roller in a constant amount and at a uniform toner density each time the developing roller rotates. For this reason, the structure of the developing device has become larger and more complicated.
もちろん、この種の現像方式においても現像効率の向上
は試みられた。たとえば本出願人は特開１眉５５−３２
０８０号、開閉５５−１３３０５８号、開閉５１３−７
０５６０吋等で改善方式を提案し、且つ実用しこも供し
ている（キャノン機種ＮＰ８５ＱＯ）。これによれば、
現像濃度をあげることができ、現像効率を上昇すること
ができた。しかし、それでも画像部においてほぼ１０（
１％に近い現像効率を達成するには至っていない。Of course, attempts have been made to improve the development efficiency in this type of development system as well. For example, the present applicant
No. 080, No. 55-133058, No. 513-7
0560 inch, etc., and also provided a practical example (Canon model NP85QO). According to this,
It was possible to increase the development density and increase the development efficiency. However, it is still almost 10 (
Development efficiency close to 1% has not yet been achieved.
現像効率の向上という点では１成分現像一方法の方が２
成分現像方法よりも優れている。その中でも本出願人が
先に出願した、特開昭５４−４３０３７号の現像方式な
いしは現像装置は現像ローラ（スリーブ）上に １００
ｇ以下のトナー薄層を形成し、スリーブ上に塗布したそ
のトナーを画像部においてほぼ１００％に近い現像効率
で現像に供することができる。このため現像器構成を小
型化・簡略化して実用化することができた。In terms of improving development efficiency, one component development method is better than the other.
Superior to component development methods. Among them, the developing method or developing device disclosed in Japanese Patent Application Laid-open No. 54-43037, which was filed earlier by the present applicant, is a developing system or a developing device that uses a 100 mm 100 mm 1.
It is possible to form a thin layer of toner of less than g and apply the toner on the sleeve for development in the image area with a development efficiency close to 100%. For this reason, the structure of the developing device could be downsized and simplified for practical use.
これは現像ローラ上に１００ル以下というトナー薄層を
形成することができたため達成されたものである。ただ
しこの現像方式はトナーとして磁性トナーを用いるもの
であり、磁性トナーは磁性を持たせるためトナー内に磁
性体を内添しなければならず、これは転写紙に転写した
現像像を熱定着する際の定着性の悪さ、現像剤自身に磁
性体を内添するため（磁性体の通常黒色である）そのカ
ラー再現の際の色彩の悪さ等の問題点がある。This was achieved because it was possible to form a thin toner layer of less than 100 l on the developing roller. However, this development method uses magnetic toner as the toner, and in order to make magnetic toner magnetic, a magnetic substance must be added to the toner, which is used to heat-fix the developed image transferred to the transfer paper. There are problems such as poor fixing properties during color reproduction, and poor color reproduction due to the addition of a magnetic material to the developer itself (magnetic material is usually black).
このため非磁性トナーの薄層形成方式としてビーバーの
毛のような柔かい円筒状のブラシにして、これにトナー
を付着塗布する方法や、表面がヘルベット等の繊維で作
られた現像ローラにドクターブレード等により塗布する
方式が提案されている。For this reason, methods for forming a thin layer of non-magnetic toner include using a soft cylindrical brush like beaver's hair to apply the toner, or using a doctor blade on a developing roller whose surface is made of fibers such as hervet. A coating method has been proposed by et al.
しかじながら、上記１８ ｍブラシにドクターブレード
としてりｉ外体ブレードを使用した場合、トナー量の規
制は回部であるが、均一な塗布は行われず、又現像ロー
ラ上の繊維ブラシを摺擦するだけではブラシの繊維間に
存在するトナーへの摩擦帯電電荷賦与は行われないため
、カブリ等の発生しやすい問題点があった。However, when an external blade is used as a doctor blade on the 18 m brush, the amount of toner is regulated by the rotation part, but uniform application is not achieved and the fiber brush on the developing roller is rubbed. However, since the triboelectric charge is not imparted to the toner existing between the fibers of the brush, there is a problem that fogging and the like are likely to occur.
面して、本出願人は上述従来の各種方式と全く異なる現
像装置として、非磁性トナーと磁性粒子を用い、トナー
担持体に対向して磁性粒子拘束部材を設け、トナー担持
体表面の移動方向に関し、磁性粒子拘束部材の上流に磁
界発生手段の磁気力によって磁性粒子の磁気ブラシを形
成し、磁性粒子拘束部材によって磁気ブラシを拘束し、
トナー担持体面に対して非磁性トナーを含む少量の磁性
粒子の薄いブラシ状磁気吸着層を形成する方法を既に提
案した（特開昭５８−１４３３６０号）。そして該トナ
ー担持体と潜像担持体とを対向させ、現像部（潜像担持
体とトナー担持体との対向部）においてＷＪ像担持体と
トナー担持体との間隙をトナ一層厚（トナー担持体面に
形成された非磁性トナーを含む少量の磁性粒子の薄いブ
ラシ状磁気吸着層）よりも広く設定し、交番電界を印加
することによって、潜像１す特休表面に潜像パターンに
対応したポジ又はネガの非磁性トナー現像画像を得る方
法を実用化した。On the other hand, the present applicant has developed a developing device that is completely different from the various conventional systems described above, using non-magnetic toner and magnetic particles, and providing a magnetic particle restraining member opposite to the toner carrier to prevent the surface of the toner carrier from moving in the direction of movement. Regarding, forming a magnetic brush of magnetic particles by the magnetic force of the magnetic field generating means upstream of the magnetic particle restraining member, and restraining the magnetic brush by the magnetic particle restraining member,
A method of forming a thin brush-like magnetic adsorption layer of a small amount of magnetic particles containing non-magnetic toner on the surface of a toner carrier has already been proposed (Japanese Patent Laid-Open No. 143360/1982). Then, the toner carrier and the latent image carrier are made to face each other, and the gap between the WJ image carrier and the toner carrier is increased so that the toner layer is thicker (the toner carrier is By applying an alternating electric field and applying an alternating electric field, a latent image pattern corresponding to the latent image pattern is formed on the surface of the special magnetic field. A method for obtaining positive or negative non-magnetic toner developed images has been put into practical use.
これは現像領域において、トナー担持体側の非磁性トナ
ーを含む磁性粒子の薄いブラシ状磁気吸着層が潜像担持
体とトナー担持体との間隙長さよりも長く形成されるか
、もしくは現像部に作用させた電界により伸長して潜像
担持体面を摺擦し、該磁性粒子のブラシ状磁気吸着層に
含まれる非磁性トナーがトナー担持体と潜像担持体との
間で往復運動を発生することによって潜像保持体側の潜
像が非磁性トナーで潜像パターンに対応してポジ現像或
はネガ現像されるものである。This is because in the developing area, a thin brush-like magnetic adsorption layer of magnetic particles containing non-magnetic toner on the toner carrier side is formed longer than the gap between the latent image carrier and the toner carrier, or it acts on the developing area. The non-magnetic toner contained in the brush-like magnetic adsorption layer of the magnetic particles is elongated by the applied electric field and rubbed on the surface of the latent image carrier, and the non-magnetic toner contained in the brush-like magnetic adsorption layer generates reciprocating motion between the toner carrier and the latent image carrier. By this, the latent image on the latent image holding body side is developed positively or negatively with non-magnetic toner in correspondence with the latent image pattern.
これにより、現像効率が極めてたかく、小型・簡素な現
像器を構成することができ、又非磁性トナーにより色彩
性のよいカラー現像像を得ることができるようになった
。特に２成分磁気ブラシ摺擦現像時にベタ画像が得られ
る。As a result, it has become possible to construct a compact and simple developing device with extremely high developing efficiency, and it has become possible to obtain color developed images with good color properties using non-magnetic toner. In particular, a solid image is obtained during two-component magnetic brush rubbing development.
上述した各種の現像方式装置のうち特に最後の現像方式
装置は現像特性に優れたもので推奨されるが、更に常に
安定した高品質・高濃度・段階調性等の現像画像性を持
続するもの、高速画像形成装置にも十分に適用できる高
い耐久性・信頼性を有するもの等の開発が望まれている
。Among the above-mentioned types of development devices, the last one is particularly recommended as it has excellent development characteristics, but it is also recommended that it always maintains stable developed image properties such as high quality, high density, and gradation. There is a desire to develop something that has high durability and reliability and can be sufficiently applied to high-speed image forming apparatuses.
本発明はこれに応えるものである。即ちトナーと磁性粒
子とからなる現像剤を現像剤担持部材に担持させ潜像担
持体面を現像する方式のものについて、常に安定して、
画像ムラやカブリのない高品質（高画質）の現像画像が
得られるようにしたものを提供することを目的とする。The present invention addresses this need. In other words, for a system in which a developer consisting of toner and magnetic particles is carried on a developer carrying member and the surface of the latent image carrier is developed, it is always stable.
It is an object of the present invention to provide a developed image of high quality (high image quality) without image unevenness or fogging.
口、発明の構成
〔問題点を解決するための手段〕
本発明は、潜像担持体上の潜像をトナー現像する現像装
置であって、トナー粒子と磁性粒子により構成される現
像剤を収容する現像剤容器部と、潜像担持体と対向して
現像剤を該潜像担持体に供給する現像部を形成するとと
もに、現像剤容器部から現像剤を該現像部に担持搬送す
る回転現像剤担持部材と、現像剤担持部材の、潜像担持
体と反対側に設けられ、該現像剤担持部材に担持されて
いる現像剤を現像部で該潜像担持体に作用させる第１の
磁界発生手段と、現像部よりも現像剤担持部材回転方向
上流側に位置し、現像剤担持部材表面から所定の間隙を
存して離間している規制部先端を有する第１の現像剤規
制部材と、現像剤規制部材と、現像剤規制部材と反対側
に設けられ、該現像剤規制部材よりも現像剤担持部材回
転方向上流側に位置する第２の磁界発生手段と、現像剤
担持部材の、上記第２の磁界発生手段と同じ側に設けら
れ、該磁界発生手段よりも現像剤担持部材回転方向上流
側に位置し、現像剤を撹拌・搬送する第３の磁界発生手
段と、現像剤担持部材の、前記第２及び第３の磁界発生
手段と反対側において、現像剤担持部材表面から離間し
、前記第１の現像剤規制部材の位置から現像剤担持部材
面に沿って該現像剤担持部材回転方向上流側に現像剤担
持部材面に対向して設けられ、且つ第１の現像剤規制部
材側とは反対側の先端部が、前記第２と第３の磁界発生
手段の間における、現像剤担持部材上法線方向の磁界強
度が実質界の位置から、第３の磁界発生手段の磁界強度
が最大となる位置までの角度範囲位置に存在する第２の
現像剤規制部材と、を有することを特徴とする現像装置
を要旨とする。SUMMARY OF THE INVENTION [Means for Solving Problems] The present invention relates to a developing device for developing a latent image on a latent image carrier with toner, which contains a developer composed of toner particles and magnetic particles. A rotary developing device that forms a developer container section that faces the latent image carrier and supplies developer to the latent image carrier, and carries and conveys the developer from the developer container section to the development section. a first magnetic field that is provided on the side of the developer carrying member opposite to the latent image carrier and causes the developer carried by the developer carrying member to act on the latent image carrier in a developing section; a first developer regulating member that is located upstream of the developing section in the rotational direction of the developer carrying member and has a regulating section distal end that is spaced apart from the surface of the developer carrying member with a predetermined gap; , a developer regulating member, a second magnetic field generating means provided on the opposite side of the developer regulating member and located upstream of the developer regulating member in the direction of rotation of the developer carrying member; A third magnetic field generating means is provided on the same side as the second magnetic field generating means, is located upstream of the magnetic field generating means in the direction of rotation of the developer carrying member, and stirs and conveys the developer; On the side of the member opposite to the second and third magnetic field generating means, the developer is spaced apart from the surface of the developer carrying member, and the developer is carried along the surface of the developer carrying member from the position of the first developer regulating member. provided on the upstream side in the rotational direction of the member so as to face the surface of the developer carrying member, and having a distal end portion on the side opposite to the first developer regulating member between the second and third magnetic field generating means; a second developer regulating member existing in an angular range position from a position where the magnetic field strength in the normal direction on the developer carrying member is a substantial field to a position where the magnetic field strength of the third magnetic field generating means is maximum; The gist is a developing device characterized by having the following features:
上記の構成により、現像容器部内の現像剤の撹拌・循環
状態、その後の規制効果が良好となり。With the above configuration, the agitation and circulation state of the developer in the developer container section and the subsequent regulation effect are good.
それにより画像ムラやカブリのない高品質の現像 ′画
像を安定に得ることが可能になった。This has made it possible to stably obtain high-quality developed images without image unevenness or fog.
図面は本発明現像装置の一実施例を示すものである。 The drawings show one embodiment of the developing device of the present invention.
第１図において、Ａは潜像担持体としてのドラム状或は
ベルト状の電子写真感光体・静電記録誘電体等であり、
矢印方向に所定速度で面移動駆動され、不図示の作像プ
ロセス機器により潜像が形成され、それが現像装置Ｂに
より顕画像として現像される。In FIG. 1, A is a drum-shaped or belt-shaped electrophotographic photoreceptor, electrostatic recording dielectric material, etc. as a latent image carrier;
It is driven to move in plane at a predetermined speed in the direction of the arrow, a latent image is formed by an image forming process device (not shown), and the latent image is developed as a visible image by the developing device B.
現像装置Ｂにおいて、１は現像容器であって、内部を隔
壁２によってトナー収納部３と、トナーと磁性粒子から
なる現像剤を収納する現像剤収納部（現像剤容器部）４
とに区画されている。トナー収納部３内の収納トナー、
及び現像剤収納部４内の現像剤は図には省略した。トナ
ー収納部３内の収納トナーはトナー搬送部材６１・６２
が回動駆動されることにより逐次隔壁２方向に搬送され
、トナー補給口１６から現像剤収納部４内へ補給される
。In the developing device B, reference numeral 1 denotes a developer container, which is internally separated by a partition wall 2 into a toner storage section 3 and a developer storage section (developer container section) 4 that stores a developer made of toner and magnetic particles.
It is divided into. Toner stored in the toner storage section 3,
The developer in the developer storage section 4 is not shown in the figure. The stored toner in the toner storage section 3 is transported by toner conveying members 61 and 62.
is sequentially conveyed toward the partition wall 2 by being rotationally driven, and is replenished into the developer storage section 4 from the toner replenishment port 16 .
７は現像剤収納部４内に配設した現像剤担持部材であり
、マグネットロール７２を内蔵した非磁性物質でできた
現像スリーブ７、で構成されている。該現像スリーブ７
、は右斜め下面部が現像剤収納部４に設けた開口部から
外部に露呈しており、現像部ｍＢは現像スリーブ７１の
上記外部露呈面部が潜像担持体Ａ面に対して所定の径小
な隙間を存して対向位置するように支持部材に位置決め
保持されている。上記潜像担持体Ａと現像スリーブ７１
との対向部ａが現像部である。Reference numeral 7 denotes a developer carrying member disposed within the developer accommodating portion 4, and is composed of a developing sleeve 7 made of a non-magnetic material and having a built-in magnet roll 72. The developing sleeve 7
, the diagonally lower right surface portion is exposed to the outside from an opening provided in the developer storage section 4, and in the developing section mB, the externally exposed surface portion of the developing sleeve 71 has a predetermined diameter with respect to the surface of the latent image carrier A. They are positioned and held on the support member so that they are opposite to each other with a small gap between them. The latent image carrier A and the developing sleeve 71
The part a facing the developing part is the developing part.
Ｓ１〜Ｓ ３、Ｎ ｌ−Ｎ ３はマグネットロール７２
の着磁位置を示している。マグネットロール７２は両端
部を固定支持されていて回転せず、その外側の現像スリ
ーブ７１がマグネ−２トロール７２の囲りを所定の周速
で矢印方向に回転駆動される。S1 to S3, Nl-N3 are magnet rolls 72
shows the magnetized position. The magnet roll 72 is fixedly supported at both ends and does not rotate, and the outer developing sleeve 71 is driven to rotate around the magnet-2 troll 72 in the direction of the arrow at a predetermined circumferential speed.
８争９は現像剤収納部４内において、現像スリーブ７Ｉ
とほぼ並行に上下に配設した現像剤撹拌・搬送手段とし
てのスクリュ軸であり、それぞれ矢印方向に回転駆動さ
れている。１７は該上下のスクリュ軸８・９の間に設け
た現像剤循環規制部材である。8 and 9 are the developing sleeves 7I in the developer storage section 4.
Screw shafts are disposed vertically in parallel with the developer agitation and conveyance means, and are driven to rotate in the directions of the arrows. Reference numeral 17 denotes a developer circulation regulating member provided between the upper and lower screw shafts 8 and 9.
１０・１４は現像剤収納部４内の上下部に配設した現像
スリーブ７□周面上の現像剤の循環規制部材、１１・１
３は現像剤収納部４の底面と現像スリーブ７１下面との
隙間部から収納現像剤が潜像担持体Ａ方向へ流動漏洩す
ることを防止するべく現像剤収納部４の底面側に配設し
た磁性部材とマグネット、１２は現像スリーブ７１の周
面に形成する現像剤の層厚を規制するために、現像スリ
ーブ７□の上面側に下辺を現像スリーブ上面に対して所
定の径小の隙間を存して対向させて配設した非磁性ブレ
ードである。Reference numerals 10 and 14 denote developer circulation regulating members on the circumferential surface of the developing sleeve 7 disposed at the upper and lower parts of the developer storage section 4; 11 and 14;
3 is disposed on the bottom side of the developer storage section 4 in order to prevent the stored developer from flowing and leaking toward the latent image carrier A from the gap between the bottom surface of the developer storage section 4 and the lower surface of the developing sleeve 71. In order to regulate the layer thickness of the developer formed on the circumferential surface of the developing sleeve 71, the magnetic member and the magnet 12 form a gap of a predetermined small diameter on the upper surface side of the developing sleeve 7□ with its lower side against the upper surface of the developing sleeve. The blades are non-magnetic blades arranged opposite to each other.
１５は現像剤収納部４内の現像剤の濃度（トナーと磁性
粒子との混合比）を検知するセンナであり、このセンサ
の出力が制御回路（不図示）へ入力され、それに応じて
前記トナー収納部３内のトナー搬送部材６１ ・６２の
回動駆動が制御される。Reference numeral 15 denotes a sensor that detects the concentration of the developer (mixing ratio of toner and magnetic particles) in the developer storage section 4. The output of this sensor is input to a control circuit (not shown), and the toner is adjusted accordingly. The rotational drive of the toner conveying members 61 and 62 in the storage section 3 is controlled.
前記マグネットロール７２の各磁極ｓ１〜Ｓ３ 、
Ｎ１〜Ｎ３ （７）つｔ）、磁極Ｎ２ ”Ｎｌ ・５
３が夫々本発明装置での第１−第２・第３の各磁界発生
手段に該当する（以下夫々第１磁極Ｎ２Φ第２磁極Ｎ、
・第３／ａ極ｓ３と記す）、他の磁極Ｓ、−Ｓ２・Ｎ３
は現像剤搬送等のための磁界発生手段である。又非磁性
ブレード１２、及び現像剤収納部４内の上部側に設けた
現像剤循環規制部材１０が夫々本発明装置での第１及び
第２の各現像剤規制部材に該当する。Each magnetic pole s1 to S3 of the magnet roll 72,
N1~N3 (7) t), magnetic pole N2 "Nl ・5
3 respectively correspond to the first, second and third magnetic field generating means in the device of the present invention (hereinafter referred to as first magnetic pole N2Φsecond magnetic pole N, respectively)
・3rd/a pole s3), other magnetic poles S, -S2・N3
is a magnetic field generating means for conveying developer and the like. The non-magnetic blade 12 and the developer circulation regulating member 10 provided on the upper side of the developer storage section 4 correspond to the first and second developer regulating members in the apparatus of the present invention, respectively.
第２の現像剤規制部材たる現像剤循環規制部材１０は、
現像剤担持部材たる現像スリーブ７、の、第１及び第２
の磁界発生手段たる第２及び第３磁極Ｎ１ ・Ｎ３と反
対側において、現像スリーブ７１表面から所定の間隙を
存して離間し、第１の現像剤規制部材たる非磁性ブレー
ド１２の位置から現像スリーブ面に沿って該現像スリー
ブ回転方向上流側に現像スリーブ７１に対向して設けら
れ、且つ非磁性ブレード１２側とは反対側の先端部１０
ａが、第２磁極Ｎ！と第３磁極Ｓ３の間における、現像
スリーブ７１」二法線方向の、第２磁極Ｎ１の磁界強度
■（第２図）と第３磁極ｓ３の磁界強度ＩＩが実質零の
位置（ワ（第２図）から、第３磁極Ｓ３の現像スリーブ
７１上法線方向の磁界強度が最大となる位置（αまでの
角度０範囲位置に存在する。The developer circulation regulating member 10, which is the second developer regulating member, is
The first and second developing sleeves 7, which are developer carrying members,
The second and third magnetic poles N1 and N3, which are magnetic field generating means, are spaced apart from the surface of the developing sleeve 71 with a predetermined gap, and from the position of the non-magnetic blade 12, which is the first developer regulating member, A tip portion 10 is provided facing the developing sleeve 71 on the upstream side in the rotational direction of the developing sleeve along the sleeve surface, and is opposite to the non-magnetic blade 12 side.
a is the second magnetic pole N! The position (W) where the magnetic field strength II of the second magnetic pole N1 (Fig. 2) and the magnetic field strength II of the third magnetic pole S3 in the two normal directions of the developing sleeve 71 between the magnetic pole S3 and the developing sleeve 71 are substantially zero. 2), the magnetic field strength of the third magnetic pole S3 in the normal direction on the developing sleeve 71 is at a maximum position (a position in the zero angle range up to α).
現像装置稼動時は現像スリーブ７１．スクリュ軸８・９
はそれぞれ所定の速度で回転駆動され、現像スリーブ７
、と潜像担持体Ａの間にはバイアス電源Ｓにより交番電
圧が印加される。When the developing device is in operation, the developing sleeve 71. Screw shaft 8/9
are each rotated at a predetermined speed, and the developing sleeve 7
, and the latent image carrier A, an alternating voltage is applied by a bias power supply S.
スクリュ軸８争９の回転により現像剤収納部４内の現像
剤は現像スリーブ７１の長手方向に十分撹拌され、現像
スリーブ７１付近ではほぼ均一なトナーと磁性粒子の混
合比が得られ、実質的に現像スリーブ７１の長手方向各
部についてのムラが除去される。Due to the rotation of the screw shafts 8 and 9, the developer in the developer storage section 4 is sufficiently stirred in the longitudinal direction of the developing sleeve 71, and a substantially uniform mixing ratio of toner and magnetic particles is obtained near the developing sleeve 71. Then, unevenness in each part of the developing sleeve 71 in the longitudinal direction is removed.
スクリュ軸８争９は夫々矢印の方向に回転するが、それ
により現像剤収納部４内の現像剤が上側のスクリュ袖８
近傍の現像剤と下側のスクリュ軸９近傍の現像剤とが夫
々のスクリュ軸の長手方向に対して反対方向に搬送され
るように上下のスクリュ軸８・９のスクリュ羽根の向き
を夫々逆向きに設定しである。The screw shafts 8 and 9 each rotate in the direction of the arrow, and as a result, the developer in the developer storage section 4 is transferred to the upper screw sleeve 8.
The directions of the screw blades of the upper and lower screw shafts 8 and 9 are reversed so that the nearby developer and the developer near the lower screw shaft 9 are transported in the opposite direction to the longitudinal direction of each screw shaft. It is set in the direction.
現像剤収納部４内における現像剤の現像剤収納部横断面
上での動きは、現像スリーブ７１の回転、スクリュ軸８
・９の回転、マグネットロール７ｚの磁界、現像剤循環
規制部材１０−１４・１７の存在、現像スリーブ７１と
現像剤との摩擦力、現像剤の重力等により第１図の白抜
き矢示の如き循頌的流動運動となる。The movement of the developer in the developer storage section 4 on the cross section of the developer storage section is caused by the rotation of the developing sleeve 71 and the screw shaft 8.
9, the magnetic field of the magnet roll 7z, the presence of the developer circulation regulating members 10-14 and 17, the frictional force between the developing sleeve 71 and the developer, the gravity of the developer, etc. It becomes a circular fluid movement like that.
而して現像剤収納部４の現像剤溜り内に臨んでいる現像
スリーブ７１の面領域にその近傍の現像剤即ちトナーを
含む磁性粒子がスリーブ７！内のマグネットロール７２
の磁力により磁気ブラシ吸着層として付着保持されて現
像スリーブ７１の回転に伴ない非磁性ブレード１２位置
へ搬送され、非磁性ブレード１２位置を通過する過程で
層厚が規制され、トナーを含む少延の磁性粒子の薄層と
なって現像部ａ（潜ｇｊ担持体Ａと現像スリーブ７１の
対面部、磁極Ｎ２付近）を通過する。Therefore, the magnetic particles containing the developer, that is, toner, in the vicinity of the surface area of the developing sleeve 71 facing into the developer reservoir of the developer storage section 4 are exposed to the sleeve 7! Inner magnet roll 72
It is adhered and held as a magnetic brush adsorption layer by the magnetic force of the developing sleeve 71, and is conveyed to the non-magnetic blade 12 position as the developing sleeve 71 rotates, and the layer thickness is regulated in the process of passing through the non-magnetic blade 12 position, and a small amount of the toner containing toner is adhered and held. The magnetic particles become a thin layer of magnetic particles and pass through the developing section a (the facing part of the latent gj carrier A and the developing sleeve 71, near the magnetic pole N2).
その現像部ａの通過過程において現像部ａに作用してい
る電界、第１ｉａ極Ｎ２の磁界作用により、現像スリー
ブ７１側の現像剤層のトナーが潜像担持体Ａ面側に潜像
パターンに対応して移行付着して潜像担持体Ａ面の潜像
のトナー現像が順次に行われる。During the process of passing through the developing section a, the toner in the developer layer on the developing sleeve 71 side forms a latent image pattern on the side of the latent image carrier A due to the action of the electric field acting on the developing section a and the magnetic field of the first ia pole N2. The latent image on the surface A of the latent image carrier A is sequentially developed with toner that is transferred and adhered accordingly.
現像に供され、現像部ａを通過した現像スリーブ７□側
の現像剤層は引続く現像スリーブ７１の回動により現像
剤収納部４内に、磁極Ｓ２・Ｎ３の磁界によりそのまま
スリーブ７１面に保持されて戻し搬送されて現像剤収納
部４内の現像剤と混り合う。The developer layer on the side of the developing sleeve 7□ that has been subjected to development and has passed through the developing section a is transferred into the developer storage section 4 by the subsequent rotation of the developing sleeve 71, and onto the surface of the sleeve 71 by the magnetic fields of the magnetic poles S2 and N3. The developer is held and transported back to mix with the developer in the developer storage section 4 .
現像剤収納部４の現像剤内のトナー分は潜像の現像に消
費されることにより経時的に磁性粒子との混合比が低下
していく、その低下度合がセンサ１５により検知されそ
の検知情報が制御回路（不図示）に入力され、低下度が
所定の許容下限になるとその信号によりトナー収納部３
内のトナー供給部材６．−６２の回転がなされ、これに
よりトナー収納部３内のトナーがトナー補給口１６から
現像剤収納部４内へ逐次導入補給される。As the toner in the developer in the developer storage section 4 is consumed to develop the latent image, the mixing ratio with magnetic particles decreases over time.The degree of this decrease is detected by the sensor 15 and the detection information is obtained. is input to a control circuit (not shown), and when the degree of decrease reaches a predetermined permissible lower limit, the signal causes the toner storage unit 3 to
toner supply member 6. -62 rotations are made, whereby the toner in the toner storage section 3 is sequentially introduced and replenished into the developer storage section 4 from the toner replenishment port 16.
補給されたトナーは現像剤収納部４内の現像剤内に取り
込まれて現像剤の全体に均一・迅速に混入していく。こ
のトナー補給により現像剤収納部４内の現像剤のトナー
分混合比が上昇し所定の許容上昇になったことがセンサ
１５により検知されると、トナー補給部材６エ・６２の
回転駆動が停止される。これにより現像剤収納部４内の
現像剤の磁性粒子に対するトナー分の混合比が常に略一
定に保たれ、常に安定した高画質画像を得ることができ
る。The replenished toner is taken into the developer in the developer storage section 4 and is mixed uniformly and quickly throughout the developer. When the sensor 15 detects that the toner mixture ratio of the developer in the developer storage section 4 has increased to a predetermined allowable increase due to this toner replenishment, the rotational drive of the toner replenishment members 6e and 62 is stopped. be done. As a result, the mixing ratio of the toner to the magnetic particles of the developer in the developer storage section 4 is always kept substantially constant, and a stable high-quality image can always be obtained.
現像剤循環規制部材１７は、スリーブ７□側では磁極Ｓ
３付近の現像剤の循環・搬送を規制すると共に、スクリ
ュ軸８或は同９に対してはガイド板の役割を果し、現像
剤の撹拌・搬送の安定化にも寄与している。又スリーブ
７１と反対側においては現像容器１との間に空隙を有し
、スクリュ軸８により循環φ搬送された現像剤の一部を
スクリュ軸９の方向へ導く作用もしている。The developer circulation regulating member 17 has a magnetic pole S on the sleeve 7□ side.
In addition to regulating the circulation and transport of the developer near the screw shaft 3, it also serves as a guide plate for the screw shaft 8 or 9, and also contributes to stabilizing the stirring and transport of the developer. Further, there is a gap between the sleeve 71 and the developer container 1 on the opposite side, which also serves to guide a portion of the developer that has been circulated φ conveyed by the screw shaft 8 toward the screw shaft 9.
センサ１５として例えば現像剤の体積検知方式、圧電素
子、インダクタンス変化検知素子、交番バイアスを利用
したアンテナ方式等を利用することができる。As the sensor 15, for example, a developer volume sensing method, a piezoelectric element, an inductance change sensing element, an antenna method using an alternating bias, etc. can be used.
而して、第２の現像剤規制部材１０についてその先端部
１０ａを、
■第１・２図例装置のように、本発明に従って前述■位
置と■位置を含み角度θ範囲位置に存在させた形態に構
成した場合、
（（２）第３図例のように、■位置よりも現像スリーブ
回転方向下流側に位置させて存在させた形態に構成した
場合、
■第４図例のように、■位置よりも現像スリーブ回転方
向」１流側に位置させて存在させた形態に構成した場合
、
の−１−記■・〈す・■の各場合における、コピー画像
の濃度、カブリ、軸方向ムラの発生具合を調べた。その
結果を下表に示す。Therefore, the tip end 10a of the second developer regulating member 10 is located in the angle θ range position including the above-mentioned positions ■ and ■, according to the present invention, as in the device shown in Figures 1 and 2. (2) As shown in the example in Fig. 3, if it is arranged in a form in which it is located downstream of the position (■) in the rotating direction of the developing sleeve; (2) As shown in the example in Fig. 4, ■When configured in a configuration in which the developing sleeve is located on the first stream side in the rotational direction of the developing sleeve, the density, fog, and axial direction of the copied image in each of the cases of -1-■, <su, and ■> The degree of occurrence of unevenness was investigated.The results are shown in the table below.
○：良好、もしくはカブリ働ムラの 発生なし。○: Good or uneven fogging No occurrence.
■二〇よりも良好。■Better than twenty.
Δ：濃度不足、もしくはカブリ・ム ラをみる、又は発生し易い。Δ: Insufficient density or fog If you see or are likely to experience la.
即ち、（■の場合は、現像剤収納部４内の現像剤は第３
磁極Ｓ３近傍で十分撹拌され、さらに部材１０の先端部
１０ａの位置でスクリュ軸８側に現像剤が循環するため
コピー画像濃度は高いものの、現像剤循環の規制が弱く
、現像剤のトナー粒子分の現像スリーブ７Ｉ及び磁性粒
子分との摺擦か弱いためコピー画像にカブリやムラが発
生し易い。又現像スリーブ７＋Ｊ二の現像剤が部材１０
によりはぎ取られる効果が弱く、現像スリーブ＠近傍で
は現像後の現像剤が完全には入れかえられず、前回の現
像画像のゴースト像がコピー画像に現われ易い。In other words, (in the case of (■), the developer in the developer storage section 4 is
Although the copy image density is high because the developer is sufficiently stirred near the magnetic pole S3 and further circulates toward the screw shaft 8 at the tip 10a of the member 10, the regulation of developer circulation is weak and the toner particles of the developer are Because of the weak friction between the developing sleeve 7I and the magnetic particles, fog and unevenness are likely to occur in the copied image. Also, the developer of developing sleeve 7 + J2 is member 10.
The peeling effect is weak, and the developer is not completely replaced after development in the vicinity of the developing sleeve, and a ghost image of the previously developed image tends to appear in the copied image.
■の場合は、現像剤循環の規制は十分にかかるものの実
際上コピー画像の濃度がでにくく、又現像剤の循環が不
十分となり、ムラを生じ易い結果となった。In the case of (2), although the developer circulation was sufficiently regulated, it was actually difficult to obtain the density of the copied image, and the developer circulation was insufficient, resulting in a tendency to cause unevenness.
■の場合はコピーの濃度は良好で、又カブリやムラの発
生をみず、良好な高品質画像を安定に得ることができた
。In the case of (2), the density of the copy was good, and good high-quality images could be stably obtained without fogging or unevenness.
この場合、部材１０の先端部１０ａは前記角度θ範囲内
の、好ましくは第３ｍ極Ｓ３の現像スリーブ７、上注線
方向の磁界強度が最大強度の１１５〜４１５になる位は
範囲θ１ （第２図）に存在させるのがよく、これによ
り現像剤の循環・撹拌・規制が特に良好で高品位の画像
を安定して得ることができる。In this case, the tip end 10a of the member 10 is within the angle θ range, preferably the developing sleeve 7 of the third m-pole S3, and the range θ1 (the third (Fig. 2), and thereby the circulation, agitation, and regulation of the developer are particularly good, and high-quality images can be stably obtained.
尚上記実施例において現像剤撹拌・搬送手段としてのス
クリュ軸８拳９、現像スリーブ７１の回転方向は実施例
のものに限定されるものではない。In the above embodiment, the rotational directions of the screw shaft 8 and the developing sleeve 71 serving as the developer stirring/conveying means are not limited to those in the embodiment.
また、撹拌・搬送手段８・９はスクリュ軸に限らず回転
羽根でも良い、マグネットロール７２の磁極数、磁極種
も実施例に限られるものではない。Further, the stirring/conveying means 8 and 9 are not limited to screw shafts, and may be rotary blades, and the number and type of magnetic poles of the magnet roll 72 are not limited to those in the embodiments.
ハ、発明の効果
以−Ｌ本発明によれば、高画質の現像画像（もしくはコ
ピー画像）を安定して出力させることができ、所期の目
的がよく達成される。C. Effects of the Invention - L According to the present invention, a developed image (or a copy image) of high quality can be stably output, and the intended purpose can be well achieved.
第１図は本発明現像装置の一実施例の横断側面図、第２
図乃至第４図は夫々第２及び第３の磁極の磁界強度と、
第２の現像剤規制部材の先端部の位置との関係説明図で
ある。
Ａは潜像担持体、Ｂは現像装置、７Ｉは現像剤担持部材
としての現像スリーブ、８・９は現像剤撹拌・搬送手段
としてのスクリュ軸、Ｎ２・Ｎ。
・５３は第１−第２０第３の磁極、第２・ｌＯは第１及
び第２の現像剤規制部材。FIG. 1 is a cross-sectional side view of one embodiment of the developing device of the present invention, and FIG.
Figures 4 to 4 show the magnetic field intensities of the second and third magnetic poles, respectively;
FIG. 7 is an explanatory diagram of the relationship between the position of the tip end of the second developer regulating member; A is a latent image carrier, B is a developing device, 7I is a developing sleeve as a developer carrying member, 8 and 9 are screw shafts as developer stirring and conveying means, N2 and N.・53 is the 1st to 20th third magnetic poles, and 2nd and 1O are the first and second developer regulating members.
Claims (1)
あつて、 トナー粒子と磁性粒子により構成される現像剤を収容す
る現像剤容器部と、 潜像担持体と対向して現像剤を該潜像担持体に供給する
現像部を形成するとともに、現像剤容器部から現像剤を
該現像部に担持搬送する回転現像剤担持部材と、 現像剤担持部材の、潜像担持体と反対側に設けられ、該
現像剤担持部材に担持されている現像剤を現像部で該潜
像担持体に作用させる第１の磁界発生手段と、 現像部よりも現像剤担持部材回転方向上流側に位置し、
現像剤担持部材表面から所定の間隙を存して離間してい
る規制部先端を有する第１の現像剤規制部材と、 現像剤担持部材の、上記第１の現像剤規制部材と反対側
に設けられ、該現像剤規制部材よりも現像剤担持部材回
転方向上流側に位置する第２の磁界発生手段と、 現像剤担持部材の、上記第２の磁界発生手段と同じ側に
設けられ、該磁界発生手段よりも現像剤担持部材回転方
向上流側に位置し、現像剤を撹拌・搬送する第３の磁界
発生手段と、 現像剤担持部材の、前記第２及び第３の磁界発生手段と
反対側において、現像剤担持部材表面から離間し、前記
第１の現像剤規制部材の位置から現像剤担持部材面に沿
って該現像剤担持部材回転方向上流側に現像剤担持部材
面に対向して設けられ、且つ第１の現像剤規制部材側と
は反対側の先端部が、前記第２と第３の磁界発生手段の
間における、現像剤担持部材上法線方向の磁界強度が実
質零の位置から、第３の磁界発生手段の磁界強度が最大
となる位置までの角度範囲位置に存在する第２の現像剤
規制部材と、 を有することを特徴とする現像装置。(1) A developing device that develops a latent image on a latent image carrier with toner, comprising: a developer container containing a developer composed of toner particles and magnetic particles; and a developing device facing the latent image carrier. a rotating developer carrying member that forms a developing section that supplies developer to the latent image carrier, and carries and conveys the developer from the developer container section to the developing section; a first magnetic field generating means provided on the opposite side and causing the developer carried by the developer carrying member to act on the latent image carrier in a developing section; Located in
a first developer regulating member having a regulating portion distal end spaced apart from the surface of the developer carrying member with a predetermined gap; and a first developer regulating member provided on the side of the developer carrying member opposite to the first developer regulating member. a second magnetic field generating means provided on the same side of the developer carrying member as the second magnetic field generating means and located upstream of the developer regulating member in the direction of rotation of the developer carrying member; a third magnetic field generating means that is located upstream of the developer carrying member in the rotational direction of the developer carrying member and stirs and transports the developer; and a side of the developer carrying member opposite to the second and third magnetic field generating means. , spaced apart from the surface of the developer carrying member and provided facing the developer carrying member surface from the position of the first developer regulating member on the upstream side in the rotational direction of the developer carrying member. and the tip on the side opposite to the first developer regulating member is located at a position between the second and third magnetic field generating means where the magnetic field strength in the normal direction on the developer carrying member is substantially zero. and a second developer regulating member that is present in an angular range position from 1 to 2, to a position where the magnetic field strength of the third magnetic field generating means is maximum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60278720A JPH071409B2 (en) | 1985-12-11 | 1985-12-11 | Development device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60278720A JPH071409B2 (en) | 1985-12-11 | 1985-12-11 | Development device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62138879A true JPS62138879A (en) | 1987-06-22 |
| JPH071409B2 JPH071409B2 (en) | 1995-01-11 |
Family
ID=17601253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60278720A Expired - Lifetime JPH071409B2 (en) | 1985-12-11 | 1985-12-11 | Development device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH071409B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6461776A (en) * | 1987-08-31 | 1989-03-08 | Canon Kk | Developing device |
| JP2006208552A (en) * | 2005-01-26 | 2006-08-10 | Canon Inc | Development unit and process cartridge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5115443A (en) * | 1974-07-27 | 1976-02-06 | Canon Kk | DENSHISHA SHINYOGENZOSOCHI |
| JPS56150773A (en) * | 1980-04-23 | 1981-11-21 | Canon Inc | Developing device |
| JPS6075854A (en) * | 1983-09-30 | 1985-04-30 | Minolta Camera Co Ltd | Dry developing device |
-
1985
- 1985-12-11 JP JP60278720A patent/JPH071409B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5115443A (en) * | 1974-07-27 | 1976-02-06 | Canon Kk | DENSHISHA SHINYOGENZOSOCHI |
| JPS56150773A (en) * | 1980-04-23 | 1981-11-21 | Canon Inc | Developing device |
| JPS6075854A (en) * | 1983-09-30 | 1985-04-30 | Minolta Camera Co Ltd | Dry developing device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6461776A (en) * | 1987-08-31 | 1989-03-08 | Canon Kk | Developing device |
| JP2006208552A (en) * | 2005-01-26 | 2006-08-10 | Canon Inc | Development unit and process cartridge |
| JP4659468B2 (en) * | 2005-01-26 | 2011-03-30 | キヤノン株式会社 | Development unit and process cartridge |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH071409B2 (en) | 1995-01-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |