JPH0466512B2 - - Google Patents
Info
- Publication number
- JPH0466512B2 JPH0466512B2 JP25163087A JP25163087A JPH0466512B2 JP H0466512 B2 JPH0466512 B2 JP H0466512B2 JP 25163087 A JP25163087 A JP 25163087A JP 25163087 A JP25163087 A JP 25163087A JP H0466512 B2 JPH0466512 B2 JP H0466512B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- magnetic
- carrier
- magnetic field
- developing device
- 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.)
- Expired
Links
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 108091008695 photoreceptors Proteins 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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
-
- 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
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は電子複写装置に用いられる現像装置の
技術分野において利用され、特に画像記録形成用
の表示装置、プリンタ、フアクシミリ電子写真装
置の種々の装置に適用可能な現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is utilized in the technical field of developing devices used in electronic copying devices, and is particularly applicable to various types of display devices for image recording, printers, and facsimile electrophotographic devices. The present invention relates to a developing device applicable to the device.
（従来の技術及び問題点）
回転可能な非磁性体からなる円筒状の現像剤担
持体の内部に固定された磁界発生手段を配し、該
現像剤担持体上に上記磁界発生手段による磁気力
によつて保持されながら現像部方向に搬送される
現像剤を、ゴム薄板等による接触圧によつて所定
の層厚に規制した後、該現像部で静電潜像担持体
に移行せしめて該像担持体上の静電潜像を現像す
る現像装置が知られている。(Prior Art and Problems) A fixed magnetic field generating means is disposed inside a rotatable cylindrical developer carrier made of a non-magnetic material, and the magnetic force generated by the magnetic field generating means is applied onto the developer carrier. The developer transported toward the developing section while being held by the developer is regulated to a predetermined layer thickness by the contact pressure of a thin rubber plate, etc., and then transferred to the electrostatic latent image carrier in the developing section. 2. Description of the Related Art A developing device that develops an electrostatic latent image on an image carrier is known.
この種の装置では、現像剤担持体はその回転に
より現像部通過後に現像剤容器内の現像剤を再び
磁気力によつて保持して上記現像部に搬送するこ
ととなる。その際、現像部に到るまでの間、現像
剤の保持を確実なものとするには、現像剤担持体
の全周囲、少なくとも現像剤容器から現像部に到
る範囲で磁界域を形成せねばならない。 In this type of device, the developer carrying member rotates to hold the developer in the developer container again by magnetic force after passing through the developing section and conveys it to the developing section. At this time, in order to ensure that the developer is retained until it reaches the developing section, a magnetic field must be formed all around the developer carrier, at least in the range from the developer container to the developing section. Must be.
そこで、従来通常の場合、磁界発生手段を四極
あるいはそれ以上の多極のものとしていた。その
ため高価なものとなつていた。現像剤担持体を小
径にすれば、当然磁界発生手段も小径となり極数
を減らすことができる。しかし単なる小径化によ
る極数の減少を行なつても磁気力が低下してしま
い、そのため現像剤の搬送性が悪くなつたり、ま
たカブリなどの現象が生じてしまう。 Therefore, conventionally, the magnetic field generating means has usually been made of four poles or more than four poles. Therefore, it had become expensive. If the developer carrier is made small in diameter, the magnetic field generating means will also be made small in diameter, and the number of poles can be reduced. However, even if the number of poles is simply reduced by making the diameter smaller, the magnetic force will decrease, resulting in poor developer conveyance and phenomena such as fog.
以上のように、多極性磁石ローラを用いる従来
の現像装置では、良質な画像を得るための十分な
磁気力を発生するため、ある程度以上径の大きい
磁界発生手段を用いるか、少極数の場合には、磁
気力がきわめて強い高価な磁石を用いた磁界発生
手段とするしかなく、小型で安価な現像装置を製
造する上で大きな問題点があつた。 As described above, in conventional developing devices that use multi-polar magnet rollers, in order to generate sufficient magnetic force to obtain high-quality images, magnetic field generating means with a diameter larger than a certain degree or with a small number of poles are used. In this case, there is no choice but to use an expensive magnet with extremely strong magnetic force as a magnetic field generating means, which poses a major problem in manufacturing a small and inexpensive developing device.
（問題点を解決するための手段）
本発明の目的は、上述のごとくの多極性磁界発
生手段をもつ現像装置の問題点を解決し、二極性
の磁界発生手段によつて小型でしかも安価、かつ
良好な画像を得られる現像装置を提供することに
ある。(Means for Solving the Problems) An object of the present invention is to solve the problems of the developing device having a multi-polar magnetic field generating means as described above, and to provide a compact and inexpensive developing device using a bipolar magnetic field generating means. The object of the present invention is to provide a developing device that can also produce good images.
本発明は、上記目的の達成のために、
内部空間に固定配置された磁界発生手段の磁気
力により現像剤を表面にて搬送する回転可能な現
像剤担持体を、現像剤が収容せられている現像剤
容器の前部開口より一部突出するように該容器内
に配し、上記現像剤担持体の上記突出部分を像担
持体に近接もしくは接触させて該現像剤担持体と
像担持体とを設置した現像装置において、
現像剤担持体は、５ミリメートル以上25ミリメ
ートル以下の円筒外径をなし、
上記磁界発生手段は周囲の二位置に磁極を有
し、一極は上記像担持体に対向する位置へ磁界を
形成するように配し、他極は現像剤容器の内部空
間の位置に配され、
上記現像剤容器の開口における、現像剤担持体
の出口側部分に、該現像剤担持体の表面と接触し
て該表面の現像剤層の厚さを規制する規制部材を
備えている、
ことにより構成される。 In order to achieve the above object, the present invention includes a rotatable developer carrier that contains a developer and transports the developer on its surface by the magnetic force of a magnetic field generating means fixedly arranged in an internal space. The developer container is disposed in the container so as to partially protrude from the front opening of the developer container, and the protruding portion of the developer carrier is brought close to or in contact with the image carrier, so that the developer carrier and the image carrier are In the developing device, the developer carrier has a cylindrical outer diameter of 5 mm or more and 25 mm or less, the magnetic field generating means has magnetic poles at two positions around the circumference, and one pole is attached to the image carrier. The other pole is arranged in a position in the internal space of the developer container, and the developer carrier is placed on the exit side portion of the developer carrier at the opening of the developer container. The device includes a regulating member that comes into contact with the surface of the body and regulates the thickness of the developer layer on the surface.
（実施例）
以下、添付図面により本発明の一実施例につい
て説明する。(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.
第１図は、本発明の最も好ましい一実施例によ
る現像装置を示したものである。本実施例による
現像装置は、カールソン電子写真法を用いた現像
装置を例にとつて説明することとし、その全体構
成は既に周知であるので、本発明に係る像担持体
たる感光体ドラムと、該感光体ドラムの外周部近
傍に設けられている現像器等について詳細に図示
し、カールソンプロセスにおける一次帯電手段、
露光手段、クリーニング手段等の図示は省略し
た。 FIG. 1 shows a developing device according to a most preferred embodiment of the present invention. The developing device according to this embodiment will be explained by taking as an example a developing device using Carlson electrophotography, and since its overall configuration is already well known, it includes a photosensitive drum as an image carrier according to the present invention, The developing device and the like provided near the outer periphery of the photoreceptor drum are illustrated in detail, and the primary charging means in the Carlson process,
Illustrations of exposure means, cleaning means, etc. are omitted.
第１図において、像担持体すなわち感光体ドラ
ム１は、矢印Ａ方向に回転自在に軸支されてお
り、該感光体ドラム１の外縁部近傍には現像器が
配設されている。上記感光体ドラム１の表層の感
光体には、例えばOPC等の公知のものが使用さ
れており、上記感光体上には、既に公知となつて
いる帯電手段及び画像露光手段等によつて静電潜
像が形成されるようになつている。 In FIG. 1, an image carrier, that is, a photosensitive drum 1 is rotatably supported in the direction of arrow A, and a developing device is disposed near the outer edge of the photosensitive drum 1. As shown in FIG. A known photoconductor such as OPC is used as the photoconductor on the surface layer of the photoconductor drum 1, and the photoconductor is statically charged by a known charging means, image exposure means, etc. An electric latent image is now formed.
現像器は、前面に開口４ａが設けられ内部に一
成分もしくは二成分の現像剤を収容せる現像剤容
器４を有し、感光体ドラム１に間隙をもつて上記
現像剤容器４から一部突出配置されて上記開口に
臨んだ回転自在な現像剤担持体たる現像スリーブ
２と、非磁性薄板からなり弾力をもつて該現像ス
リーブ２と接触している規制部材５を有し、さら
に上記現像スリーブ２内には、二つの磁性３ａ，
３ｂをもつ磁界発生手段としてのマグネツトロー
ル３が固定配置されている。なお、本実施例で
は、規制部材５として厚さ１mm、硬度65°のウレ
タンゴムを用いた。かかる二極のマグネツトロー
ルは、複数の磁石を張り合せて造るような多極性
マグネツトロールとは違い、単一の磁石から造る
ことができるので、製造方法も容易であり、磁極
で発揮される磁気力が、同径の多極性マグネツト
ロールの磁極で発揮される磁気力に比べて非常に
強い。 The developing device has a developer container 4 having an opening 4a on the front surface and containing a one-component or two-component developer therein, and partially protrudes from the developer container 4 with a gap in between the photoreceptor drum 1. It has a developing sleeve 2 which is a rotatable developer carrier arranged and facing the opening, and a regulating member 5 made of a non-magnetic thin plate and elastically in contact with the developing sleeve 2. 2 contains two magnetic 3a,
A magnet roll 3 having a magnetic field generating means 3b is fixedly arranged. In this example, urethane rubber with a thickness of 1 mm and a hardness of 65° was used as the regulating member 5. Unlike multipolar magnet rolls, which are made by pasting multiple magnets together, such bipolar magnet rolls can be made from a single magnet, so they are easy to manufacture, and the magnetic poles exhibit The magnetic force exerted by the magnetic roll is extremely strong compared to the magnetic force exerted by the magnetic poles of a multipolar magnet roll of the same diameter.
上記のごとくの現像スリーブ２は、矢印Ｂ方向
（反時計方向）に回転し、上記マグネツトロール
３の磁力によつて上記現像スリーブ２の表面に一
成分系もしくは二成分系の現像剤が付着し、現像
器の外部に向け、すなわち現像領域へ搬出するよ
うになつている。なお、本実施例では、現像スリ
ーブと感光体ドラムとの間に所定間隙が設定され
ている例で説明しているが、両者が接触している
場合、いわゆる弾性現像スリーブを用いたときに
も適用可能である。 The developing sleeve 2 as described above rotates in the direction of arrow B (counterclockwise), and one-component or two-component developer is attached to the surface of the developing sleeve 2 by the magnetic force of the magnet roll 3. Then, it is carried out to the outside of the developing device, that is, to the developing area. In this embodiment, a predetermined gap is set between the developing sleeve and the photoreceptor drum. However, if the two are in contact with each other, even if a so-called elastic developing sleeve is used. Applicable.
上記現像スリーブ２には、現像バイアス電源が
接続されている。すなわち、直流成分が重畳され
ている交互電界を上記現像スリーブ２と像担持体
の少なくとも画像部との間に形成することによつ
て、該現像スリーブ２の上記感光体ドラム１の外
周面と近接対向している現像部位（領域）に拘束
されている上記現像剤を上記感光体ドラム１上に
移行せしめ、該感光体ドラム１上に形成されてい
る静電潜像を現像するように構成されている。 A developing bias power source is connected to the developing sleeve 2. That is, by forming an alternating electric field in which a DC component is superimposed between the developing sleeve 2 and at least the image portion of the image carrier, the developing sleeve 2 is brought close to the outer circumferential surface of the photoreceptor drum 1. The developer is configured to transfer the developer bound to the opposing development portions (areas) onto the photoreceptor drum 1 and develop the electrostatic latent image formed on the photoreceptor drum 1. ing.
次に、現像スリーブ２内に固定配置されている
磁界発生手段たるマグネツトロール、特にその磁
極位置について説明する。 Next, a description will be given of the magnet roll, which is a magnetic field generating means fixedly disposed within the developing sleeve 2, and in particular, the position of its magnetic pole.
マグネツトロール３の二つの極３ａ，３ｂのう
ち３ｂは、感光体ドラム１との最近接部たる現像
部に位置しているが、３ａは現像剤容器４の開口
４ａに位置している。すなわち、両極３ａ，３ｂ
は、マグネツトロール３の中心を挟んで反対側に
位置しているが、好ましくはマグネツトロール３
のほぼ一直径線上に位置していることである。こ
うすることにより、両磁極による磁界範囲は最大
限有効に活かされ、現像スリーブ２には十分なる
現像剤が付着されることとなる。仮に、上記磁極
３ａが容器４の開口４ａ内にない場合には、現像
スリーブに付着する現像剤の量が不足してしま
い、現像時に画像ムラ等を起こす原因となつてし
まう。 Of the two poles 3a and 3b of the magnet roll 3, 3b is located at the developing section closest to the photosensitive drum 1, while 3a is located at the opening 4a of the developer container 4. That is, both poles 3a and 3b
are located on opposite sides of the center of the magnet roll 3, but are preferably located on opposite sides of the magnet roll 3.
It is located approximately on one diameter line. By doing so, the range of the magnetic field produced by both magnetic poles is utilized to the maximum extent possible, and a sufficient amount of developer is deposited on the developing sleeve 2. If the magnetic pole 3a is not within the opening 4a of the container 4, the amount of developer adhering to the developing sleeve will be insufficient, causing image unevenness during development.
しかし、上記のような二極性のマグネツトロー
ル３を従来のごとくの比較的大径のものに採用し
ても、その現像装置には、現像剤の搬送性が悪化
する傾向を示す。なぜなら、従来は、多極性のマ
グネツトロールを採用することにより、現像部に
対する磁極以外に、現像剤の搬送性に寄与する磁
極が複数存在するのに対し、上記二極性マグネツ
トロールでは、それに相当する磁極が一つしかな
いからである。 However, even if the bipolar magnet roll 3 described above is adopted as a conventional one with a relatively large diameter, the developing device tends to have poor developer conveyance. This is because conventionally, by employing a multipolar magnet roll, there are multiple magnetic poles that contribute to developer conveyance in addition to the magnetic poles for the developing section, whereas the above-mentioned bipolar magnet roll has This is because there is only one corresponding magnetic pole.
しかし、この問題点も上記現像スリーブ２の径
を小さくすれば、二極のマグネツトロール３であ
つても十分現像剤が搬送されて良質な画像が得ら
れることが判明した。この点が本発明の特徴の一
つである。特に、現像スリーブの外径が５〜25mm
において優れていることが確認された。 However, it has been found that even with this problem, if the diameter of the developing sleeve 2 is made smaller, the developer can be sufficiently transported even with the bipolar magnet roll 3, and a high-quality image can be obtained. This point is one of the features of the present invention. In particular, the outer diameter of the developing sleeve is 5 to 25 mm.
It was confirmed that it is excellent in
以下、本実施例装置を他の従来のものと比較し
つつ、その画像階調性について実験を行なつたの
で、その結果を第２図を参照して示すこととす
る。 Hereinafter, while comparing the apparatus of this embodiment with other conventional apparatuses, an experiment was conducted regarding its image gradation, and the results will be shown with reference to FIG.
第２図は、現像スリーブに印加した直流成分電
圧値を差し引いたドラムの表面電圧値（以下SD
バイアスと略記）を横軸に、コピー後の画像濃度
値をマクベスRD514（登録商標）を用いて反射濃
度を測定した結果を縦軸に、現像スリーブの外径
をパラメータとして示したものである。なお、こ
の実験においては、現像はジヤンピング現像法を
用いて行なつた。 Figure 2 shows the drum surface voltage value (SD
The horizontal axis shows the image density value after copying (abbreviated as bias), the vertical axis shows the result of measuring the reflection density using Macbeth RD514 (registered trademark), and the outer diameter of the developing sleeve is shown as a parameter. In this experiment, development was performed using a jumping development method.
ジヤンピング現像法とは、現像スリーブと感光
体ドラムとの間隔を、例えば本例では約300μmに
保ち、現像スリーブと感光体ドラムとの間に、−
250Vの直流に1.3KVで1.5KHzの交流バイアスを
重畳することにより、現像剤である例えば一成分
磁性トナーを現像スリーブから感光体ドラム上の
静電潜像へと飛ばして現像する方式である。 In the jumping development method, the distance between the developing sleeve and the photoreceptor drum is maintained at, for example, approximately 300 μm in this example, and a -
By superimposing an alternating current bias of 1.3 KV and 1.5 KHz on a 250 V direct current, the developer, for example, one-component magnetic toner, is caused to fly from the developing sleeve to the electrostatic latent image on the photoreceptor drum for development.
第２図に示された各曲線についての実験条件は
以下の通りである。 The experimental conditions for each curve shown in FIG. 2 are as follows.
曲線：現像スリーブの外径が32mmであり，その
内空間には、該現像スリーブ表面上で
1000G（ガウス）の外部磁場を発する四
極のマグネツトロールが固定されてい
る。Curve: The outer diameter of the developing sleeve is 32 mm, and the inner space has a curve on the surface of the developing sleeve.
A four-pole magnet roll that emits an external magnetic field of 1000G (Gauss) is fixed.
曲線：現像スリーブの外径が20mmであり，その
内空間には、該現像スリーブ表面上で
800G（ガウス）の外部磁場を発する四極
のマグネツトロールが固定されている。Curve: The outer diameter of the developing sleeve is 20 mm, and the inner space has a curve on the surface of the developing sleeve.
A four-pole magnet roll that emits an 800G (Gauss) external magnetic field is fixed.
曲線：現像スリーブの外径が10mmであり，その
内空間には、該現像スリーブ表面上で
500G（ガウス）の外部磁場を発する四極
のマグネツトロールが固定されている。Curve: The outer diameter of the developing sleeve is 10 mm, and the inner space has a curve on the surface of the developing sleeve.
A four-pole magnet roll that emits an external magnetic field of 500G (Gauss) is fixed.
破曲線：現像スリーブの外径が10mmであり，そ
の内空間には、該現像スリーブ表面上で
750G（ガウス）の外部磁場を発する二極
のマグネツトロールが固定されている。Broken curve: The outer diameter of the developing sleeve is 10 mm, and the inner space has a
A two-pole magnet roll that emits an external magnetic field of 750G (Gauss) is fixed.
すなわち、曲線〜が従来の多極（四極）の
マグネツトロールを用いたもので、破曲線が本
実施例の二極のマグネツトロールを用いた現像装
置についての実験結果である。 That is, the curves ~ are the experimental results for the developing device using the conventional multi-pole (quadrupole) magnet roll, and the broken curve is the experimental result for the developing device using the bipolar magnet roll of this embodiment.
第４図の結果から、
SDバイアスが0Vにおいて、曲線は他の曲
線と比べ濃度が高い。 From the results in Figure 4, when the SD bias is 0V, the concentration of the curve is higher than the other curves.
曲線と破曲線は他の曲線に比べて緩やか
である。 Curves and dashed curves are gentler than other curves.
という点が明らかに言える。This is clearly the case.
上記の現象は、いわゆるカブリであり、曲線
での画質においては、コピー画像の白地部分に
現像剤の付着が目立つてきて、使用上問題があ
る。 The above-mentioned phenomenon is so-called fog, and when it comes to curved image quality, the adhesion of developer to the white background portion of the copied image becomes noticeable, which poses a problem in use.
また上記の現象は、階調性の良さを表わすも
のである。曲線の立ち上がりが急であればある
程、画像の階調性が出しにくいわけで、これに対
して該図における破曲線は、傾きが緩やかであ
り、画像の階調を出すのに優れているといえる。 Furthermore, the above phenomenon indicates good gradation. The steeper the rise of the curve, the harder it is to bring out the gradation of the image.On the other hand, the dashed curve in the figure has a gentler slope and is better for bringing out the gradation of the image. It can be said.
以上の実験結果から総合して、曲線の場合に
は、飛散やカブリがなく、Dmaxが十分に出る上
にムラもなく階調性にも非常に富んだ画像が得ら
れると結言できる。なお、この傾向は現像スリー
ブの外径が５〜25mmの範囲でも同様であることも
確認された。 Overall, from the above experimental results, it can be concluded that in the case of a curved image, there is no scattering or fogging, a sufficient Dmax is obtained, and an image with no unevenness and extremely rich gradation can be obtained. It was also confirmed that this tendency was the same even when the outer diameter of the developing sleeve was in the range of 5 to 25 mm.
さらに、本発明実施例では、弾力性を有する非
磁性薄板５をその一面が現像スリーブに接触する
ように設けており、間隔をもつて配された規制部
材の場合に比して現像剤容器開口部を広くする構
成をとることができ、現像器構成の設計仕様範囲
を広げることができる。その結果、規制部材まで
の現像スリーブ上の現像剤の搬送距離も十分とる
ことができるため、現像剤の摩擦帯電付与も十分
かつ安定したものとなる。 Furthermore, in the embodiment of the present invention, the non-magnetic thin plate 5 having elasticity is provided so that one side thereof is in contact with the developing sleeve. It is possible to adopt a configuration with a wider section, and it is possible to widen the design specification range of the developer configuration. As a result, a sufficient distance for transporting the developer on the developing sleeve to the regulating member can be ensured, so that triboelectric charging of the developer can be sufficiently and stably achieved.
また、非磁性薄板５と現像スリーブ２との当接
部は、磁極３ａに近づけた方が薄いトナー薄層を
得ることができる。すなわち、機械的な規制力に
磁気的な規制力が加わるためである。 Furthermore, a thinner toner layer can be obtained by placing the contact portion between the nonmagnetic thin plate 5 and the developing sleeve 2 closer to the magnetic pole 3a. That is, this is because magnetic regulating force is added to mechanical regulating force.
本発明は、上述した実施例にもとづいたよう
な、非磁性薄板の当接の形態が現像スリーブの回
転方向に対して従方向である場合の他に、現像ス
リーブの回転方向に対して逆方向に当接している
場合でも適用できる。第３図は、このような現像
スリーブの回転方向に対して逆方向に非磁性薄板
を当接させた一実施例である。この実施例におい
ても、非磁性薄板の当接の形態をスリーブの回転
方向に対して従方向である場合と同様な効果を示
し、飛散やカブリがなく、Dmaxも十分に出るう
えにムラもなく階調性にも非常に富んだ画像が得
られる。 In addition to the case where the non-magnetic thin plate contacts in the subordinate direction with respect to the rotational direction of the developing sleeve as in the above-described embodiment, the present invention also provides an arrangement in which the non-magnetic thin plate contacts in the reverse direction with respect to the rotational direction of the developing sleeve. It can be applied even when it is in contact with the FIG. 3 shows an embodiment in which a non-magnetic thin plate is brought into contact with the developing sleeve in a direction opposite to the rotating direction. This example also exhibits the same effect as when the non-magnetic thin plate is brought into contact with the direction of rotation of the sleeve in the direction of rotation, and there is no scattering or fogging, and the Dmax is sufficient and there is no unevenness. Images with extremely rich gradation can be obtained.
また、上記非磁性薄板は、りん青銅やステンレ
ス鋼の薄板を用いたり、またこれらに現像スリー
ブとの当接部にゴムを固着したものとしてもよ
い。 Further, the non-magnetic thin plate may be a thin plate of phosphor bronze or stainless steel, or may have rubber fixed to the contact portion with the developing sleeve.
なお、現像スリーブ表面はトナーへの摩擦帯
電、現像剤の搬送などの向上のため公知の方法に
より0.5〜5μmの凹凸を設けることが好ましい。
本実施例では＃400のサンドブラスト処理したア
ルミニウムスリーブを用いた。 Incidentally, it is preferable that the surface of the developing sleeve is provided with irregularities of 0.5 to 5 μm by a known method in order to improve the frictional charging of the toner and the conveyance of the developer.
In this example, a #400 sandblasted aluminum sleeve was used.
（発明の効果）
以上のごとく、本発明によれば、磁界発生手段
として、径が大きなもしくは高価なマグネツトロ
ールを用いることなく、小径の二極マグネツトロ
ールを使うことにより、飛散やカブリのない階調
性の優れた画像を得られるだけでなく、現像部と
逆側の位置に現像剤取込みの磁極を配置すること
となり、二極マグネツトロールの磁気力を最大限
有効に生かした現像剤供給が行なわれて、さらに
ムラの全くない良好な画像を得ることができる現
像装置を提供できる。しかも装置全体の小型化に
貢献する。また、現像剤収納容器の開口部に、現
像スリーブ内のマグネツトロールの一つの磁極を
配置しているため、該磁極に対して規制部を配置
する方法よりも該開口部を十分広くとることがで
き、現像器設計上の自由度がとれる。その結果、
現像剤へのトリボ賦与も安定する。(Effects of the Invention) As described above, according to the present invention, scattering and fogging can be avoided by using a small-diameter bipolar magnet roll as a magnetic field generating means without using a large-diameter or expensive magnet roll. Not only is it possible to obtain images with excellent gradation, but the magnetic pole for taking in the developer is placed on the opposite side of the developing section, making development possible by making the most of the magnetic force of the two-pole magnet roll. It is possible to provide a developing device in which agent is supplied and a good image with no unevenness can be obtained. Moreover, it contributes to miniaturization of the entire device. In addition, since one magnetic pole of the magnet roll in the developing sleeve is arranged at the opening of the developer storage container, the opening can be made sufficiently wider than the method in which a regulating section is arranged with respect to the magnetic pole. This allows for greater flexibility in developing device design. the result,
Tribo-imposition to the developer is also stabilized.
また、小径の現像スリーブを用いて、接触弾性
ブレードによる現像剤規制を行なう場合、現像ス
リーブの曲率が大きいため両者の形成する接触部
での楔状空間は狭くはならず現像剤はつまり易く
なることはなくなる。 In addition, when using a small-diameter developing sleeve to regulate developer using a contact elastic blade, the wedge-shaped space at the contact area formed by the two does not become narrow because the curvature of the developing sleeve is large, making it easy for the developer to become clogged. will disappear.
第１図は本発明の一実施例の概要構成を示す縦
断面図、第２図は第１図装置による実験結果を従
来のものと比較して示す図、第３図は本発明の他
の実施例の概要構成を示す縦断面図である。
１……像担持体（感光ドラム）、２……現像剤
担持体（現像スリーブ）、３……磁界発生手段
（マグネツトロール）、３ａ，３ｂ……磁極、４…
…現像剤容器、４ａ……開口、５……規制部材。
FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an embodiment of the present invention, FIG. 2 is a diagram showing experimental results using the device shown in FIG. 1 in comparison with a conventional device, and FIG. FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an embodiment. 1... Image carrier (photosensitive drum), 2... Developer carrier (developing sleeve), 3... Magnetic field generating means (magnet roll), 3a, 3b... Magnetic pole, 4...
...developer container, 4a...opening, 5...regulating member.
Claims (1)
気力により現像剤を表面にて搬送する回転可能な
現像剤担持体を、現像剤が収容せられている現像
剤容器の前部開口より一部突出するように該容器
内に配し、上記現像剤担持体の上記突出部分を像
担持体に近接もしくは接触させて該現像剤担持体
と像担持体とを設置した現像装置において、 現像剤担持体は、５ミリメートル以上25ミリメ
ートル以下の円筒外径をなし、 上記磁界発生手段は周囲の二位置に磁極を有
し、一極は上記像担持体に対向する位置へ磁界を
形成するように配し、他極は現像剤容器の内部空
間の位置に配され、 上記現像剤容器の開口における、現像剤担持体
の出口側部分に、該現像剤担持体の表面と接触し
て該表面の現像剤層の厚さを規制する規制部材を
備えている、 ことを特徴とする現像装置。 ２ 磁界発生装置の二極は、現像剤担持体のほぼ
一直径線の上に位置していることを特徴とする特
許請求の範囲第１項記載の現像装置。 ３ 規制部材は、弾力を有する非磁性薄板で形成
されていることを特徴とする特許請求の範囲第１
項記載の現像装置。[Scope of Claims] 1. A rotatable developer carrier that conveys developer on its surface by the magnetic force of a magnetic field generating means fixedly arranged in an internal space is attached to a developer container in which developer is stored. A developing device in which the developer carrier and the image carrier are disposed in the container so as to partially protrude from the front opening, and the protruding portion of the developer carrier is placed close to or in contact with the image carrier. In the apparatus, the developer carrier has a cylindrical outer diameter of 5 mm or more and 25 mm or less, and the magnetic field generating means has magnetic poles at two positions around the periphery, and one pole generates a magnetic field at a position facing the image carrier. The other electrode is arranged at a position in the internal space of the developer container, and is in contact with the surface of the developer carrier at the outlet side portion of the developer carrier at the opening of the developer container. A developing device comprising: a regulating member that regulates the thickness of the developer layer on the surface. 2. The developing device according to claim 1, wherein the two poles of the magnetic field generating device are located on approximately one diameter line of the developer carrier. 3. Claim 1, characterized in that the regulating member is formed of a non-magnetic thin plate having elasticity.
Developing device as described in section.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25163087A JPH0194364A (en) | 1987-10-07 | 1987-10-07 | Developing device |
| US07/254,151 US4936249A (en) | 1987-10-07 | 1988-10-06 | Developing apparatus having a two pole stationary magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25163087A JPH0194364A (en) | 1987-10-07 | 1987-10-07 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0194364A JPH0194364A (en) | 1989-04-13 |
| JPH0466512B2 true JPH0466512B2 (en) | 1992-10-23 |
Family
ID=17225681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25163087A Granted JPH0194364A (en) | 1987-10-07 | 1987-10-07 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0194364A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4842134B2 (en) * | 2005-12-05 | 2011-12-21 | 三菱電機株式会社 | Elevator monitoring system |
-
1987
- 1987-10-07 JP JP25163087A patent/JPH0194364A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0194364A (en) | 1989-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2948238B2 (en) | Developing device | |
| JPH0462077B2 (en) | ||
| JPS5911105B2 (en) | Seiden Zou Nojiki Brush Gen Zouhou | |
| US4994859A (en) | Power cloud developing apparatus with a first and second electric field curtain generating means | |
| JP4067583B2 (en) | Electrophotographic developing device | |
| JPH0455872A (en) | Developing device | |
| JP2768071B2 (en) | Developing device | |
| JPH0466512B2 (en) | ||
| JPH08202153A (en) | Developing device | |
| JPH0466513B2 (en) | ||
| JPH0466511B2 (en) | ||
| JPH0466514B2 (en) | ||
| JPH05297721A (en) | Developing device | |
| JP3397416B2 (en) | Developing device | |
| JP2673597B2 (en) | Developing device | |
| JPS6337363A (en) | Image forming device | |
| JPH0466515B2 (en) | ||
| JPS6341069B2 (en) | ||
| JPH0194367A (en) | Developing device | |
| JPH05232820A (en) | Image forming device | |
| JPH01120589A (en) | Developing device | |
| JPH10307468A (en) | Developing device and electrophotographic device provided with the same | |
| JPS59192268A (en) | Development device | |
| JPS5942565A (en) | Developing device of electrophotographic device | |
| JPH0194370A (en) | Developing device |