JPH0387872A - Developing device - Google Patents

Abstract

PURPOSE:To perform uniform development having no irregularity in density by putting the distance between a vertical line which passes the shaft center of a carrier and a vertical line which passes the shaft center of a carrying agitator member below a developer carrier in specific relation with the diameter of the developer carrier. CONSTITUTION:The vertical line passing the shaft center of a developing sleeve 5 is denoted as O and the vertical line passing the shaft center of the 1st carrying agitator member 8 is denoted as H. This H shows the horizontal distance between the shaft center of the developing sleeve 5 and the shaft center of the member 8 and is in a range of -L/2<=H<=L, where L is the diameter of the developing sleeve 5. Here, a developer D1 whose toner is consumed at a development position 3a after passing a control blade 6 reaches a repulsive pole N2. Then magnetic attractive forces from repulsive poles N2 and N3 to the shaft center of the sleeve 5 are ceased, so the developer D1 is peeled off the sleeve 5 to fall. The fallen developer D1 is agitated with a developer in a member. Then part of the developer D1 is lifted to the sleeve 5 with the magnetic attractive force of the magnetic pole N3 and reaches the blade 6. The remaining unlifted developer is agitated by the member 8.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は複写機等の電子写真法による画像形成装置に用
いられる現像装置に関し、特に二成分磁気ブラシ現像を
行う現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing device used in an electrophotographic image forming apparatus such as a copying machine, and more particularly to a developing device that performs two-component magnetic brush development.

［従来の技術］ 従来、鉄粉、フェライト等の磁性粉（以下キャリアとい
う）とからなる二成分現像剤を使用する現像装置にあっ
ては、二成分現像剤を磁石に吸着させてブラシ状とし、
この磁気ブラシを感光体上の静電潜像に対し摩擦するこ
とにより顕画像を形成することとしている。[Prior Art] Conventionally, in a developing device that uses a two-component developer made of magnetic powder (hereinafter referred to as carrier) such as iron powder or ferrite, the two-component developer is attracted to a magnet and made into a brush shape. ,
A visible image is formed by rubbing this magnetic brush against the electrostatic latent image on the photoreceptor.

このような現像装置としては、例えば第６図に示すよう
なものが知られている。この装置は、平均粒径が数十ミ
クロンの磁性キャリアと同数くクロンのトナーとを一定
割合で混合した二成分の現像剤り。を用いるものである
。図中、現像容器１０５に収容された現像剤り。は、層
圧規制部材１００により、内部に固定された磁界発生手
段１０１を有する非磁性スリーブ１０２上に薄層コーテ
ィングされる。この薄層化された現像剤り。は、スリー
ブ１０２の表面を矢印方向へ搬送され、静電潜像の形成
された感光ドラム１０３の対向位置即ち現像部へ達する
。現像部においては、電源１０４からＤＣを重畳した、
例えば電圧はピーク・トウ・ピークで２ＫＶ、周波数は
２ＫＨ！の交流バイアスが印加され、ドラム１０３上の
潜像がトナーにより現像化される。そして、現像に使用
された現像剤り。を攪拌するための攪拌手段である。As such a developing device, for example, the one shown in FIG. 6 is known. This device uses a two-component developer that mixes a magnetic carrier with an average particle diameter of several tens of microns and a toner of the same number of microns at a fixed ratio. is used. In the figure, a developer is stored in a developer container 105. is coated in a thin layer by the layer pressure regulating member 100 on the non-magnetic sleeve 102 having the magnetic field generating means 101 fixed therein. This thinned layer of developer. is conveyed along the surface of the sleeve 102 in the direction of the arrow, and reaches a position opposite the photosensitive drum 103 on which the electrostatic latent image is formed, that is, a developing section. In the developing section, DC is superimposed from the power source 104.
For example, the voltage is 2KV peak to peak, and the frequency is 2KH! An alternating current bias is applied, and the latent image on the drum 103 is developed with toner. And the developer used for development. It is a stirring means for stirring.

［発明が解決しようとする課題］ しかしながら、しかる従来例にあっては、次のような問
題を生じていた。[Problems to be Solved by the Invention] However, in the conventional example, the following problems have occurred.

すなわち、まず、上記装置において非磁性スリーブ１０
２上に形成される現像剤り。はＡＣバイアスにより強制
的に現像されるため、現像部を通った現像剤り。は、は
とんどトナーの存在しないものとなっている。そして、
この現像剤Ｄｏか再び現像容器１０５に収容され、再度
規制部材１００により薄層化される場合には、非磁性ス
リーブ１０２に現像済の現像剤り。か多く残っているた
め部分的にトナー濃度が下がり、この結果、トナー消費
を受けた部分と受ない部分の画ｆＩｌ濃度が異っていわ
ゆるゴーストと呼ばれる現像が発生する。That is, first, in the above device, the non-magnetic sleeve 10
The developer layer formed on 2. Because it is forcibly developed by AC bias, the developer that passes through the developing section is absorbed. , there is almost no toner present. and,
When this developer Do is stored in the developer container 105 again and thinned again by the regulating member 100, the developed developer Do is stored in the non-magnetic sleeve 102. Since a large amount of toner remains, the toner density partially decreases, and as a result, the image fIl density differs between the area where the toner has been consumed and the area where the toner has not been consumed, resulting in development called a so-called ghost.

この問題を解決するため、前記攪拌手段１０６の現像剤
攪拌能力を高めること１層圧規制部材１００近傍の現像
剤り。のバッキング密度を高めること等の方法が案出さ
れているが、その場合でも画像濃度の均一化を充分に達
成することはできない。In order to solve this problem, the developer agitation ability of the agitating means 106 is increased to reduce the amount of developer near the first layer pressure regulating member 100. Some methods have been devised, such as increasing the backing density, but even in this case, it is not possible to achieve sufficient uniformity of image density.

他方、現像容器１０５内において、非磁性スリーブ１０
２に付着した現像済の現像剤り。をスフレイブ部材を用
いて剥離することも案出されているが、その場合、ゴー
スト現象は解決されるものの、該スリーブ１０２を回転
させるためのトルクが上昇するとともに、スフレイブ部
材によりスリーブ表面が摩耗して現像剤り。の搬送能力
が悪化するという新たな問題が生ずる。On the other hand, inside the developer container 105, the non-magnetic sleeve 10
The developed developer adhered to 2. It has also been devised to peel off the sleeve 102 using a soflave member, but in that case, although the ghost phenomenon is resolved, the torque for rotating the sleeve 102 increases and the sleeve surface is worn away by the soflave member. Add developer. A new problem arises in that the conveyance capacity of the container deteriorates.

［課題を解決するための手段］ 上記目的を達成するため、本発明にあっては、低位置に
固設された複数の磁極を有する磁界発生手段と、この磁
界発生手段を囲売して回動するように設けられた非磁性
の現像剤担持体とを有し、規制手段により規制された現
像剤を磁界発生手段で現像担持体の表面に保持して磁気
刷子を形成し、さらに、該現像担持体を回動させ潜像が
形成された被現像面に磁気刷子を接触させることで現像
を行う現像装置において、前記磁界発生手段の複数の磁
極のうち、現像領域より下流に互いに隣接する磁極を同
磁性として反発磁界を形成するとともに、現像剤担持体
の下方に第１ＩＩ送攪拌部材を有し、現像剤担持体の軸
中心を通る垂直線と第１搬送、攪拌部材の軸中心を通る
垂直線の距離をＨとして、現像剤担持体の直径なＬとす
ると−Ｌ／２≦Ｈ≦Ｌの範囲にあることを特徴とする。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a magnetic field generating means having a plurality of magnetic poles fixedly installed at a low position, and this magnetic field generating means is sold and distributed. a non-magnetic developer carrier disposed to move, the developer regulated by the regulating means is held on the surface of the developer carrier by a magnetic field generating means to form a magnetic brush; In a developing device that performs development by rotating a developer carrier and bringing a magnetic brush into contact with a surface to be developed on which a latent image is formed, among the plurality of magnetic poles of the magnetic field generating means, magnetic poles adjacent to each other downstream from the developing region The magnetic poles are made homomagnetic to form a repulsive magnetic field, and a first II feeding and stirring member is provided below the developer carrier, and a vertical line passing through the axial center of the developer carrier and the axial center of the first conveying and stirring member are connected to each other. If H is the distance between the passing vertical lines and L is the diameter of the developer carrier, it is characterized by being in the range -L/2≦H≦L.

上記構成を有する本発明にあっては、現像時に現像領域
より現像方向下流に移動した現像済の現像剤は、反発磁
界により現像剤担持体からすみやかに離脱し、この現像
剤を装置内の現像前の現像剤と混合することか可能とな
る。In the present invention having the above configuration, the developed developer that has moved downstream in the development direction from the development area during development is quickly separated from the developer carrier by the repulsive magnetic field, and the developer is transferred to the developer in the apparatus. It is possible to mix it with the previous developer.

［実施例］ 以下、本発明を図示の実施例に基づいて説明する。[Example] Hereinafter, the present invention will be explained based on illustrated embodiments.

第１図は本発明の一実施例に係る現像装置を備えた電子
写真法による画像形成装置の要部を示すものである。FIG. 1 shows the main parts of an electrophotographic image forming apparatus equipped with a developing device according to an embodiment of the present invention.

同図において、被現像面すなわち感光体ドラムｌは、矢
印ａ方向に回転自在に軸支されており、該感光体トラム
１の下方であって外縁部近傍には本実施例の現像器２が
配設されている。In the figure, the surface to be developed, that is, the photosensitive drum 1 is rotatably supported in the direction of arrow a, and the developing device 2 of this embodiment is located below the photosensitive tram 1 and near the outer edge. It is arranged.

前記感光体ドラムｌ上の感光体には、例えばＯＰＣ等の
公知のものが使用されており、前記感光体上には、公知
となっている夫々不図示の帯電手段及び画像形成手段に
よって静電潜像が形成されるようになっている現像器２
は、感光体ドラムｌの外周面に近接して配設されている
現像部３と、該現像部３と隣接して配設された該現像部
３と連通ずるホッパ部４とを具備している。A known photoconductor such as OPC is used as the photoconductor on the photoconductor drum l, and electrostatic charges are applied to the photoconductor by known charging means and image forming means (not shown), respectively. A developing device 2 in which a latent image is formed
comprises a developing section 3 disposed close to the outer circumferential surface of the photoreceptor drum l, and a hopper section 4 disposed adjacent to the developing section 3 and communicating with the developing section 3. There is.

現像部３には、該現像部３の前記感光体ドラムｌの外周
面と対向する部位に形成されている開口部に臨ませてド
ラム回転と順方向又は逆方向に回転自在に配設された現
像剤担持体としての現像スリーブ５と、前記開口部上側
に先端部が現像スリーブ５の外周面に向けて取り付けら
れている規制部材としての規制ブレード６と、前記現像
部３の底部の前記ホッパ部４と連通している側に回転自
在に取り付けられている第２搬送攪拌部材９と、前記現
像部３の底部の前記現像スリーブ５の略直下に相当する
部位に前記第２搬送攪拌部材９と平行に配設された回転
自在な第１搬送攪拌部材８とを夫々設けである。In the developing section 3, a drum is provided so as to face an opening formed in a portion of the developing section 3 facing the outer circumferential surface of the photoreceptor drum 1, and to be rotatable in the forward or reverse direction of drum rotation. A developing sleeve 5 as a developer carrier, a regulating blade 6 as a regulating member whose tip end is attached above the opening so as to face the outer circumferential surface of the developing sleeve 5, and the hopper at the bottom of the developing section 3. A second conveyance agitation member 9 is rotatably attached to the side communicating with the developing section 4, and a second conveyance agitation member 9 is provided at a portion of the bottom of the developing section 3 corresponding to substantially directly below the developing sleeve 5. and a rotatable first conveyance stirring member 8 disposed in parallel with each other.

現像スリーブ５の内部には、直径が該現像スリーブ５の
内径よりも小径で、Ｎ極とＳ極とか配設されている磁界
発生手段としてのマグネットローラ１０が前記現像スリ
ーブ５と同心に配設固定されており、この現像スリーブ
５には、現像バイアス電圧印加電源１１から現像バイア
ス電圧が印加されるようになっている。現像スリーブ５
においては、現像バイアス電圧印加電源１１から印加さ
れた現像バイアス電圧によって前記現像部内に収納され
ている二成分径現像剤りを該現像スリーブ５の外周面に
吸着せしめ、回転によって該現像剤りを感光体ドラム１
の外周面側へと運搬する。この場合、前記規制ブレード
６は、現像スリーブ５の回転によって感光体ドラムｌの
外周面へと運搬される二成分径現像剤りの搬出量を一定
量以下に規制して、該搬出か規制された二成分径現像剤
りの層を現像部３内に保持し続けさせる。Inside the developing sleeve 5, a magnet roller 10, which serves as a magnetic field generating means and has a diameter smaller than the inner diameter of the developing sleeve 5 and has an N pole and an S pole, is disposed concentrically with the developing sleeve 5. A developing bias voltage is applied to the developing sleeve 5 from a developing bias voltage applying power source 11. Developing sleeve 5
, the two-component diameter developer contained in the developing section is attracted to the outer circumferential surface of the developing sleeve 5 by a developing bias voltage applied from a developing bias voltage applying power supply 11, and the developer is rotated. Photosensitive drum 1
Transport it to the outer circumferential side. In this case, the regulating blade 6 regulates the discharge amount of the two-component diameter developer transported to the outer circumferential surface of the photoreceptor drum l by the rotation of the developing sleeve 5 to a certain amount or less. The layer of two-component diameter developer is maintained in the developing section 3.

また、前記第２４１１送攪拌手段９は、駆動されること
によって前記連通部位を介して前記ホッパ部４より補給
されるトナー１２と現像部３内に停滞しているキャリア
成分とを攪拌して良好な混合状態な雑持しながら前記現
像スリーブ５ｇｓに搬送するようになっている。一方、
前記第１搬送攪拌部材８は、前記第２搬送攪拌手段９と
同様に駆動されることによって前記現像部３内に停滞し
ている二威分径現像剤りのキャリア成分とトナー１２と
を攪拌して良好な混合状態を雑持しながら前記現像スリ
ーブに供給するようになっている。尚、現像スリーブ５
と第２搬送攪拌部材９との間には、鉛直方向に対し所定
の角度を有する壁面１３を設けである。Further, the 2411th feeding and agitating means 9 is driven to agitate the toner 12 supplied from the hopper section 4 via the communication portion and the carrier component stagnant in the developing section 3. The developing sleeve 5gs is conveyed to the developing sleeve 5gs in a mixed state. on the other hand,
The first conveyance agitation member 8 is driven in the same manner as the second conveyance agitation means 9 to agitate the toner 12 and the carrier component of the dual diameter developer stagnant in the development section 3. The developer is supplied to the developing sleeve while maintaining a good mixed state. In addition, the developing sleeve 5
A wall surface 13 having a predetermined angle with respect to the vertical direction is provided between and the second conveying and stirring member 9.

次に、現像スリーブ５の内部に固設されたマグネットロ
ール１０の磁極配置について説明する。すなわち、第１
図に示すように、現像部位３ａに　入する現像磁極Ｓ１
は、感光体ドラムｌに対向しており、該現像磁極ＳＩの
現像方向下流側には、反発しあう磁極Ｎ　、、　Ｎ、を
磁極する。ここで、反発磁極Ｎ３．Ｎ２の角度、即ち１
、＜　Ｎ　２０　Ｎ　：ｌにツイテは、望ましくは、９
０＠以上であることが良好で、６０″〜１８ｏ０て効果
が得られた。また磁極Ｎ　、、　Ｎ　、の中心点におけ
る磁束については、はば０（Ｇ）になるよう構成する。Next, the magnetic pole arrangement of the magnet roll 10 fixed inside the developing sleeve 5 will be explained. That is, the first
As shown in the figure, the developing magnetic pole S1 enters the developing area 3a.
is opposed to the photoreceptor drum 1, and magnetic poles N, , N, which repel each other are provided on the downstream side of the developing magnetic pole SI in the developing direction. Here, repulsive magnetic pole N3. The angle of N2, i.e. 1
, < N 20 N :l Tweet is preferably 9
The magnetic flux at the center point of the magnetic poles N, N, is preferably 0 (G).

第２図は、現像スリーブ５表面上における角度と磁束密
度との関係、即ち磁束パターンを示すものである同図か
ら理解されるように、マグネットロール１０の磁極を第
１図に示す如く配置することで、現像時に規制ブレード
６により規制された現像剤Ｄ１は、現像部位３ａて現像
を終えた後、現像スリーブ５の時計方向への回転に伴っ
て矢印方向へ移動するが、反発する磁極Ｎ　２．　Ｎ　
３間においてスリーブ表面への磁気的吸引力かゼロとな
るためスリーブ表面から剥離して落下する。この落下し
た現像剤Ｄ１は、第１搬送攪拌部材８へ導かれる一方第
１搬送攪拌部材８からは、新たに、磁極Ｎ２５２の磁気
吸引力により現像スリーブ５に供給される。このように
、反発極によって剥離された現像剤り、は、第１搬送攪
拌部材８により、容器内の現像剤りと混合され、現像ス
リーブ５に供給される。本実施例において、現像スリー
ブ５と第１搬送攪拌部材、部材８との位置関係を説明す
ると、第３図に示すように現像スリーブ５の軸中心を通
る垂直線０とし、第１搬送攪拌部材８の軸中心を通る垂
直線Ｈとする。FIG. 2 shows the relationship between the angle and the magnetic flux density on the surface of the developing sleeve 5, that is, the magnetic flux pattern.As can be understood from the figure, the magnetic poles of the magnet roll 10 are arranged as shown in FIG. As a result, the developer D1 regulated by the regulation blade 6 during development moves in the direction of the arrow as the development sleeve 5 rotates clockwise after completing development at the development site 3a, but the repelling magnetic pole N 2. N
3, the magnetic attraction force to the sleeve surface becomes zero, so it peels off from the sleeve surface and falls. This fallen developer D1 is guided to the first conveyance agitation member 8, and from the first conveyance agitation member 8, it is newly supplied to the developing sleeve 5 by the magnetic attraction force of the magnetic pole N252. In this way, the developer separated by the repulsion electrode is mixed with the developer in the container by the first conveying and agitating member 8, and is supplied to the developing sleeve 5. In this embodiment, to explain the positional relationship between the developing sleeve 5, the first conveying agitating member, and the member 8, as shown in FIG. A vertical line H passing through the center of the axis of 8.

Ｈは現像スリーブの軸中心と、第１搬送攪拌部材８の軸
中心の水平距離を表わしており、本発明では、現像スリ
ーブの直径を１とすると−Ｌ／２≦Ｈ≦Ｌの範囲にある
ことを特徴とする現像装置である第３図の実施例で説明
すると、現像スリーブの直径りは２０■Ｌ水平距離Ｈは
、７ｍ■で行った。図中の矢印は、現像剤の流れを表わ
している矢印■は、規制ブレード６を通過して現像部位
３ａでトナー消費された現像剤Ｄ□は反発極Ｎ２に達す
る。矢印■は反発極Ｎ２Ｎｉより現像スリーブ８軸中心
方向の磁気吸引力がなくなるので、現像剤Ｄ□は現像ス
リーブ８より剥離し落下する。矢印■、■は落下した現
像剤Ｄ１は第１攪拌部材８の回転方向に搬送され、第１
攪拌部材内にあった現像剤と一緒に攪拌される。矢印■
は攪拌搬送された現像剤Ｄ１の一部は磁極Ｎ３の磁気吸
引力によって現像スリーブ５に持ち上げられる。矢印■
は、持ち上げられた現像剤りは規制プレート６に達する
。矢印■は磁極Ｎ３で持ち上げられなかった現像剤Ｄ１
は何回も第１攪拌部材８で攪拌搬送される。H represents the horizontal distance between the axial center of the developing sleeve and the axial center of the first transport stirring member 8, and in the present invention, assuming the diameter of the developing sleeve to be 1, it is in the range of -L/2≦H≦L. In the example shown in FIG. 3, which is a developing device characterized by the following, the diameter of the developing sleeve was 20 L, and the horizontal distance H was 7 m. The arrows in the figure represent the flow of the developer. The arrow (■) indicates the developer D□, which has passed through the regulating blade 6 and has been consumed in the development area 3a, reaches the repulsion pole N2. As indicated by the arrow ■, the magnetic attraction force in the axial center direction of the developing sleeve 8 is lost from the repulsive pole N2Ni, so the developer D□ is separated from the developing sleeve 8 and falls. Arrows ■ and ■ indicate that the fallen developer D1 is conveyed in the rotational direction of the first stirring member 8, and
It is stirred together with the developer that was in the stirring member. Arrow■
A part of the agitated and conveyed developer D1 is lifted onto the developing sleeve 5 by the magnetic attraction force of the magnetic pole N3. Arrow■
The lifted developer reaches the regulation plate 6. Arrow ■ indicates developer D1 that was not lifted by magnetic pole N3.
is stirred and conveyed many times by the first stirring member 8.

以上説明したように第３図における実施例においては現
像部位３ａでトナー消費か多くても、現像剤Ｄ□の撹拌
が充分に行われ、濃度ムラのない現像を得ることができ
た。As explained above, in the embodiment shown in FIG. 3, even if a large amount of toner was consumed in the development area 3a, the developer D□ was sufficiently stirred, and development without density unevenness could be obtained.

また第４図、第５図のように現像スリーブ５の軸中心と
第１搬送攪拌部材８の軸中心との水平圧ｆａＨか−Ｌ／
２≦Ｈ≦Ｌ以外の範囲にある場合は、第４図、第５図に
示すように、現像スリーブ８より、剥離した現像剤り、
か第１搬送攪拌部材８の回転方向に搬送てきず、点線矢
印■に示すように磁極Ｎｚａｉ気吸引大吸引力て、現像
スリーブ５に吸引され、トナー消費された現像剤り、か
攪拌されないで現像部位３ａに搬送され、現像すると、
濃度ムラが生じ好ましくなかった。In addition, as shown in FIGS. 4 and 5, the horizontal pressure faH between the axial center of the developing sleeve 5 and the axial center of the first transport stirring member 8 is -L/
If the range is other than 2≦H≦L, as shown in FIGS. 4 and 5, the developer peeled off from the developing sleeve 8,
Or the developer is not conveyed in the rotational direction of the first conveyance stirring member 8, and as shown by the dotted arrow (■), the magnetic pole Nzai has a large suction force, and the developer is sucked into the developing sleeve 5 and the toner is consumed, or the developer is not stirred. When it is transported to the development area 3a and developed,
Undesirable density unevenness occurred.

以上本実施例では現像スリーブの直径２０ｍｍで行った
が、現像スリーブの直径が大きくなっても小さくなって
も、現像スリーブから落下する位置が直径してきまるの
で第１搬送攪拌部材の軸中心との水平距離Ｈと現像スリ
ーブ直径しで表わすと−Ｌ／２≦Ｈ≦Ｌの範囲であれば
現像剤の攪拌は充分に行われた。As mentioned above, in this example, the diameter of the developing sleeve was 20 mm, but regardless of whether the diameter of the developing sleeve becomes larger or smaller, the position where it falls from the developing sleeve will have a diameter, so When expressed as the horizontal distance H and the developing sleeve diameter, the developer was sufficiently agitated as long as -L/2≦H≦L.

［発明の効果］ 以上の構成及び作用を有する本発明にあってはスフレイ
ブ部材等の機械的手段を用いることなく現像剤担持体か
ら現像部の現像剤を剥離又は除去することかでき、第１
搬送攪拌部材て充分に攪拌することかでき、濃度ムラの
ない均一な現像をすることができる。[Effects of the Invention] In the present invention having the above-described configuration and operation, the developer in the developing section can be peeled off or removed from the developer carrier without using mechanical means such as a spray member.
The conveyance stirring member can sufficiently stir the image, and uniform development without density unevenness can be achieved.

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

８１図は本発明の現像装置の一実施例を示す概略構成図
、 第２図は磁極の角度とスリーブ表面の磁束密度との関係
を示すグラフ、 第３図は第１図の現像スリーブと第１搬送部材の位置が
−Ｌ／２≦Ｈ≦Ｌの範囲にある概略構成図、 第４図は第１図の現像スリーブと第１搬送部材の位置か
−Ｌ／２＞Ｈにある概略構成図、第５図は第１図の現像
スリーブと第１ｇ！送部材の位置がＨ＞Ｌにある概略構
成図、 第６図は従来の現像装置を適用した画像形戊装置の要部
を示す概略構成図である。 ｌ　・・・感光体ドラム ２　・・・現像器 ３　・・・現像部 ３ａ　・・・現像部位 ４　・・・ホッパ部 ５　・・・現像スリーブ ６　・・・規制ブレード １０　・・・マグネットローラ １２　・・・トナー １３　・・・壁面 り、Ｄ、−・・現像剤 Ｎｌ、Ｎ２．Ｎ３．　Ｓｔ、　Ｓｔ”磁極第 図 図面の浄書（内容に変更なし） Ｅ 目＜−ｉ 図面の浄書（内容に変更なし） Ｈ＞ｉ 図面の浄書（内容に変更なし） ＝ 手 続 補 正 書（方式） １、事件の表示 平成 １年 ２５３７３ 発明の名称 現像装置 ３、補正をする者 事件との関係Figure 81 is a schematic configuration diagram showing one embodiment of the developing device of the present invention, Figure 2 is a graph showing the relationship between the angle of the magnetic pole and the magnetic flux density on the sleeve surface, and Figure 3 is a graph showing the relationship between the developing sleeve of Figure 1 and the magnetic flux density of the sleeve surface. A schematic configuration diagram in which the position of the first conveying member is in the range -L/2≦H≦L, and FIG. 4 is a schematic configuration diagram in which the position of the developing sleeve and the first conveying member in FIG. 1 is in the range -L/2>H. Figure 5 shows the developing sleeve shown in Figure 1 and 1g! FIG. 6 is a schematic diagram showing the main parts of an image forming apparatus to which a conventional developing device is applied. l...Photosensitive drum 2...Developer 3...Developing section 3a...Developing section 4...Hopper section 5...Developing sleeve 6...Regulating blade 10...Magnet roller 12 ...Toner 13...Wall surface, D, -...Developer Nl, N2. N3. St, St" Magnetic pole diagram drawing (no change in content) E<-i Drawing drawing (no change in content) H>i Drawing (no change in content) = Procedural amendment (method) 1 , Display of the case 1999 25373 Name of the invention Developing device 3, Person making the amendment Relationship to the case

Claims (2)

【特許請求の範囲】[Claims] （１）トナー粒子と磁性粒子とを有する現像剤を収容す
る現像剤容器と、潜像を維持する潜像担持体と対向して
トナー粒子を該潜像担持体に供給する現像部を形成する
とともに、前記前期容器から現像剤を該現像部に維持搬
送する現像剤担持体と、前記現像剤担持体の前記現像剤
維持表面と反対側に設けられた固定磁界発生手段と、前
記現像剤担持体表面上に塗布される磁性粒子とトナー粒
子との量を規制する手段とを有し、 キャリア粒子とトナー粒子とを有する現像剤を現像部で
用いて潜像を現像する現像装置において、該現像剤担持
体の下方に第１搬送攪拌部材を有し、該現像担持体の軸
中心を通る垂直線と、該第１搬送攪拌部材の軸中心を通
る垂直線、この距離をＨとして、該現像剤担持体の直径
をＬとすると−１／Ｌ≦Ｈ≦Ｌの範囲にあることを特徴
とする現像装置(1) Forming a developer container containing a developer having toner particles and magnetic particles, and a developing section that faces a latent image carrier that maintains a latent image and supplies toner particles to the latent image carrier. Also, a developer carrier that maintains and transports the developer from the container to the developing section, a fixed magnetic field generating means provided on a side opposite to the developer retaining surface of the developer carrier, and the developer carrier. A developing device which develops a latent image using a developer having carrier particles and toner particles in a developing section, the developing device having a means for regulating the amount of magnetic particles and toner particles applied to a body surface. A first transport stirring member is provided below the developer carrier, and the distance between a vertical line passing through the axial center of the developer carrier and a vertical line passing through the axial center of the first transport stirring member is defined as H. A developing device characterized in that the diameter of the developer carrier is in the range of -1/L≦H≦L. （２）特許請求の範囲第１項に記載の現像装置において
、前期現像剤維持部材の前記潜像担持体と反対側に設け
られ該現像剤を該現像部で該潜像体に接触させる第１磁
界発生手段（Ｓ１）前記第１磁界発生手段よりも下流に
設けられた、第２磁界発生手段（Ｎ３）前記第２磁界発
生手段よりも下流に設けられた第３磁界発生手段（Ｎ２
）前記第２磁界発生手段と前記第３磁界発生手段の極を
同極性として、該第２磁界発生手段と該３磁界発生手段
の角度をＯとすると、Ｏ≧９０゜の範囲にあることを特
徴とする現像装置(2) In the developing device according to claim 1, the developer retaining member is provided at a side opposite to the latent image carrier and brings the developer into contact with the latent image body in the developing section. 1 magnetic field generating means (S1), a second magnetic field generating means (N3) provided downstream of the first magnetic field generating means; and a third magnetic field generating means (N2) provided downstream of the second magnetic field generating means.
) If the second magnetic field generating means and the third magnetic field generating means have the same polarity and the angle between the second magnetic field generating means and the third magnetic field generating means is O, then O≧90°. Characteristic developing device