JPH0690573B2 - Development device - Google Patents
Development deviceInfo
- Publication number
- JPH0690573B2 JPH0690573B2 JP59104471A JP10447184A JPH0690573B2 JP H0690573 B2 JPH0690573 B2 JP H0690573B2 JP 59104471 A JP59104471 A JP 59104471A JP 10447184 A JP10447184 A JP 10447184A JP H0690573 B2 JPH0690573 B2 JP H0690573B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- developer
- magnetic force
- magnetized
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0921—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】 技術分野 本発明は、乾式現像装置に関し、より詳細には、一成分
系磁性現像剤を使用する現像装置に関するものである。Description: TECHNICAL FIELD The present invention relates to a dry developing device, and more particularly to a developing device using a one-component magnetic developer.
従来技術 一般に、現像剤搬送体の内部に磁界発生手段を備えその
磁力により磁性現像剤を表面に担持し搬送する方式の現
像装置においては、現像剤が搬送体の両端部から漏れ出
る傾向がある。この為、搬送体の両端部にシール部材を
設けその漏出を防止する方法等が採られている。然る
に、磁界発生手段と現像剤を担持する表面部が一体的に
形成された現像剤搬送体を用いる場合は、磁極が搬送体
の両端部まで一様に着磁されている為、磁性現像剤がそ
の磁力により両端部まで移動しやすくシール部材でその
移動を阻止することは難しい。現像剤が漏れると、例え
ば電子写真複写機の現像装置である場合は、駆動部分，
軸受，感光体，光学系統又は帯電器系統等の機内部品を
汚染し、複写機の機能に重大な支障を及ぼしかねない。2. Description of the Related Art Generally, in a developing device of a system in which a magnetic field generating means is provided inside a developer carrier and a magnetic developer is carried on the surface by magnetic force and carried, the developer tends to leak from both ends of the carrier. . For this reason, a method has been adopted in which seal members are provided at both ends of the carrier to prevent the leak. However, in the case of using the developer transport body in which the magnetic field generating means and the surface portion for carrying the developer are integrally formed, the magnetic developer is magnetized uniformly because the magnetic poles are evenly magnetized to both ends of the transport body. However, due to the magnetic force, it is easy to move to both ends, and it is difficult to prevent the movement by the seal member. When the developer leaks, for example, in the case of a developing device of an electrophotographic copying machine, a driving part,
It may contaminate internal parts such as bearings, photoconductors, optical system or charger system, and seriously impair the function of the copying machine.
目 的 本発明は、以上の点に鑑みなされたものであって、画像
形成に悪影響を及ぼすこと無く磁性現像剤の漏れが簡単
且つ確実に防止されている現像装置を提供することを目
的とする。The present invention has been made in view of the above points, and an object of the present invention is to provide a developing device in which leakage of a magnetic developer is easily and reliably prevented without adversely affecting image formation. .
構 成 以下、本発明の構成について、具体的な実施例に基づき
説明する。第１図は本発明の１実施例としての一成分系
磁性トナーを用いる電子写真複写機の現像装置を示した
模式図である。第１図において、現像剤搬送体としての
現像スリーブ１が回転自在に支承されており、例えば反
時計方向に所定速度で回転駆動され磁性トナーをその周
表面に担持し搬送する。現像スリーブ１は、円筒状の導
電性基体1aの外周面に磁界発生手段としてのマグネット
層1bと現像剤を担持する電極層1cが順次積層され、構成
されている。この内、マグネット層1bは磁性トナーの漏
れを防止すべく、次の様に形成されている。Structure Hereinafter, the structure of the present invention will be described based on specific examples. FIG. 1 is a schematic diagram showing a developing device of an electrophotographic copying machine using a one-component magnetic toner as one embodiment of the present invention. In FIG. 1, a developing sleeve 1 as a developer transporting body is rotatably supported, and is rotatively driven, for example, in a counterclockwise direction at a predetermined speed to carry and carry magnetic toner on its peripheral surface. The developing sleeve 1 is configured by sequentially laminating a magnet layer 1b as a magnetic field generating means and an electrode layer 1c carrying a developer on the outer peripheral surface of a cylindrical conductive substrate 1a. Among them, the magnet layer 1b is formed as follows in order to prevent leakage of the magnetic toner.
本例のマグネット層1bは、誘電体材料と磁性材料の混合
体から成り、その表面部には、第２図に示す如く、多数
の微細な磁極が同一極性が現像スリーブ１の軸方向に沿
って3mm以下の間隔で並ぶ様にストライプ状に着磁され
ている。従って、周方向には、第１図に示す如く、互い
に極性が異なる磁極が並ぶ態様となる。そして、マグネ
ット層1bの両端部は、第２図に示される如く、着磁され
ていない。この様な着磁構成を容易に得るには、まず一
度マグネット層1b全周面にわたって着磁した後、第３図
に示す如く、製作中の現像スリーブ１′を回転させつつ
その端部に交流磁場発生器AGを近接させ、端部全周を減
磁乃至は脱磁処理すれば良い。この様にして得られたマ
グネット層1b端部の磁力分布は、第４図の如くなる。第
４図においては、縦軸に表面磁束密度（磁力）Brをとり
横軸に軸方向位置をとってある。この場合、所定の磁力
が保持されているＡ領域を画像部に、磁力の低下が開始
するＢ領域及び略脱磁されているＣ領域を非画像部に夫
々設定すれば、B,C領域の存在が画像形成に支障を及ぼ
すことも無い。そして、従来技術の如く磁性現像剤がマ
グネット層1bの端部の磁力により端部側に強制的に移動
せしめられることもなく、現像剤の漏出を容易に防止す
ることができる。The magnet layer 1b of this example is made of a mixture of a dielectric material and a magnetic material, and on its surface portion, as shown in FIG. 2, many fine magnetic poles have the same polarity along the axial direction of the developing sleeve 1. Are magnetized in stripes so that they are arranged at intervals of 3 mm or less. Therefore, as shown in FIG. 1, magnetic poles having different polarities are lined up in the circumferential direction. Both ends of the magnet layer 1b are not magnetized as shown in FIG. In order to easily obtain such a magnetized structure, first, the entire circumference of the magnet layer 1b is magnetized once, and then, as shown in FIG. It suffices to bring the magnetic field generator AG close to each other, and demagnetize or demagnetize the entire circumference of the end portion. The magnetic force distribution at the end of the magnet layer 1b thus obtained is as shown in FIG. In FIG. 4, the vertical axis is the surface magnetic flux density (magnetic force) Br, and the horizontal axis is the axial position. In this case, if the area A in which a predetermined magnetic force is held is set in the image portion, and the area B in which the decrease in magnetic force starts and the substantially demagnetized area C are set in the non-image portion, respectively, Presence does not hinder image formation. Further, unlike the prior art, the magnetic developer is not forcibly moved to the end portion side by the magnetic force of the end portion of the magnet layer 1b, and the developer leakage can be easily prevented.
ここで、着磁構成の他のいくつかの変形例について説明
する。第５図は、同一極性の磁極が螺旋状に着磁された
もので、その両端部に同様に磁力が低下若しくは消失し
たB,C領域が確保されている。この場合の磁力分布は、
上記ストライプ状の場合と略同様である。この様な着磁
構成は、着磁手段の磁力を両端部を着磁する際に適宜コ
ントロールしつつ螺旋状に着磁しても得られるが、それ
は上述したストライプ状に着磁する場合よりも難しい。
従って、同一磁力で一旦全周面に螺旋状に着磁した後、
例えば上記方法等により外部から両端部の磁力を消失す
る方法がより好適である。この着磁構成は、後述するト
ナー薄層化用の磁性ブレードの振動を抑制する効果を有
する。Here, some other modified examples of the magnetized configuration will be described. In FIG. 5, magnetic poles of the same polarity are magnetized in a spiral shape, and B and C regions where the magnetic force is similarly reduced or disappeared are secured at both ends thereof. The magnetic force distribution in this case is
This is substantially the same as the case of the stripe shape. Such a magnetizing structure can be obtained by spirally magnetizing while appropriately controlling the magnetic force of the magnetizing means at the time of magnetizing both ends, but it is more advantageous than the above-mentioned magnetizing in stripes. difficult.
Therefore, after spirally magnetizing the entire circumference with the same magnetic force,
For example, a method of extinguishing the magnetic force at both ends from the outside by the above method is more preferable. This magnetized structure has the effect of suppressing the vibration of the magnetic blade for toner thinning, which will be described later.
第6a図は、マグネット層1bの両端部を除く全周面を同一
極性に着磁（斜交線で示す）したもので、従って、第6b
図に示される如く、導電性基体1a側に逆極性の磁極が形
成されている。この場合も、一旦全周面に同一極性の磁
極を着磁した後、両端部に脱磁処理を施せば良い。具体
的には、マグネット層1bを構成している材料の抗磁力よ
りも充分に大きい磁界を発生する永久磁石を磁力消去手
段として用い、これを現像スリーブ１′の回転速度より
もゆっくりと近づけ遠ざける動作を繰り返すことによ
り、可能である。Fig. 6a shows that all the peripheral surfaces of the magnet layer 1b except the both end portions are magnetized to have the same polarity (shown by diagonal lines).
As shown in the figure, magnetic poles having opposite polarities are formed on the side of the conductive substrate 1a. In this case as well, the magnetic poles of the same polarity are once magnetized on the entire circumferential surface, and then demagnetization processing may be performed on both ends. Specifically, a permanent magnet that generates a magnetic field that is sufficiently larger than the coercive force of the material forming the magnet layer 1b is used as magnetic force erasing means, and this is moved closer to and away from the rotational speed of the developing sleeve 1 '. This is possible by repeating the operation.
第7a図は、一様に同一極性が着磁されたマグネット層1b
周面の端部で、画像形成に関与しない非画像領域内の端
面よりも若干中央側に寄った箇所Ｅを、選択的に全周に
わたり脱磁処理したものである。従って、その軸方向に
対する磁力分布は、第7b図に示す如くなる。即ち、非画
像領域内の箇所Ｅにおいて、局部的に磁力が低下し、こ
の箇所Ｅには反発磁界が形成される。この反発磁界は磁
性現像剤の現像スリーブ１端部への移動を阻止するのに
有効である。FIG. 7a shows a magnet layer 1b uniformly magnetized with the same polarity.
At the end of the peripheral surface, a portion E slightly closer to the center than the end surface in the non-image area that is not involved in image formation is selectively demagnetized over the entire circumference. Therefore, the magnetic force distribution in the axial direction is as shown in FIG. 7b. That is, the magnetic force is locally reduced at the location E in the non-image area, and a repulsive magnetic field is formed at the location E. This repulsive magnetic field is effective in preventing the magnetic developer from moving to the end of the developing sleeve 1.
又、第8a図は、ストライプ状に着磁された現像スリーフ
１′に対し、その端部に永久磁石を近接させて端部全周
面を一方極性の例えばＮ極に着磁したものである。この
場合、磁力線は第8b図に示される如く形成され、端部周
面の一方極性の磁力を相対的に小さく設定してあり、従
って、他の着磁構成のマグネット層1bと同様に磁性現像
剤の漏出を防止する効果を奏する。Further, FIG. 8a shows a developing sleeve 1'which is magnetized in a stripe shape, and a permanent magnet is brought close to the end thereof so that the entire peripheral surface of the end is magnetized to one polarity, for example, N pole. . In this case, the magnetic lines of force are formed as shown in FIG. 8b, and the magnetic force of one polarity of the end peripheral surface is set to be relatively small. Therefore, the magnetic development is performed in the same manner as in the other magnetized magnetic layer 1b. It has the effect of preventing leakage of the agent.
第１図に戻って、マグネット層1bの上には、誘電性材料
からなる保持材によりその表面部に多数の微小電極1c1
が互いに電気的に絶縁状態に保持されて成るフロート電
極層1cが積層されている。本例の電極層1cは、その層厚
が1mm以内となる様に薄く積層されている。従って、マ
グネット層1bのB,C領域と略同一領域を現像スリーブ１
周面のB,C領域として非画像領域に設定すればよい。Returning to FIG. 1, a large number of microelectrodes 1c 1 are formed on the surface of the magnet layer 1b by a holding material made of a dielectric material.
Float electrode layers 1c, which are held in an electrically insulated state from each other, are laminated. The electrode layer 1c of this example is thinly laminated so that the layer thickness is within 1 mm. Therefore, the developing sleeve 1 is formed in the substantially same region as the B and C regions of the magnet layer 1b.
The non-image area may be set as the B and C areas on the peripheral surface.
以上の如く構成された現像スリーブ１の周面近傍の適所
には、トナーＴを貯留し現像スリーブ１の周面に適量づ
つ補給するポッパ２が配設されている。本例のトナーＴ
は、一成分系磁性トナーであり、樹脂中に磁性粉を混合
し平均粒径が約６μm,真比重が1.75となる様に調整され
ている。A popper 2 that stores the toner T and replenishes the peripheral surface of the developing sleeve 1 in an appropriate amount is provided at an appropriate position near the peripheral surface of the developing sleeve 1 configured as described above. Toner T of this example
Is a one-component magnetic toner, which is prepared by mixing magnetic powder in resin so that the average particle diameter is about 6 μm and the true specific gravity is 1.75.
ホッパ２の現像スリーブ１の回転方向における下流側に
は、例えばSK材等の弾性磁性体から成るドクタブレード
３が配設されている。ドクタブレード３は、一端を保持
する保持部3aに設定された押圧力とマグネット層1bの磁
力とが併さった適度な圧接力によりその先端部3bを現像
スリーブ１周面に圧接させ、その圧接部Ｐで搬送されて
くるトナーＴを挟圧し、層厚を規制してトナー薄層を形
成すると共にこの際の摩擦により現像に必要な電荷を摩
擦帯電させる。この場合、現像スリーブ１の両端部周辺
は、磁性トナーＴの漏出を防止すべく次の様に構成され
ている。A doctor blade 3 made of an elastic magnetic material such as SK material is disposed downstream of the developing sleeve 1 in the hopper 2 in the rotation direction. The doctor blade 3 has its tip portion 3b pressed against the peripheral surface of the developing sleeve 1 by an appropriate pressure contact force that is a combination of the pressing force set in the holding portion 3a holding one end and the magnetic force of the magnet layer 1b. The toner T conveyed by P is pinched, the layer thickness is regulated to form a thin toner layer, and the friction at this time triboelectrically charges the charge necessary for development. In this case, the periphery of both ends of the developing sleeve 1 is configured as follows in order to prevent leakage of the magnetic toner T.
第9a図及び第9b図に示される如く、ドクタブレード３
は、その側端部3cが、現像スリーブ１周面上の前述した
マグネット層1bのB,C領域に対応する非画像領域に設定
した磁力が低下し若しくは作用しない領域B,Cにおい
て、現像スリーブ１と当接若しくは近接する様に、配設
されている。そして、このドクタブレード３の上から、
トナーＴの漏出を防止する為のシール部材４が、同様に
非画像領域B,C内において現像スリーブ１に当接せしめ
られている。即ち、ドクタブレード側端部3cとシール部
材４は、現像スリーブ１周面の非画像領域B,Cにおいて
オーバラップする態様となる。本例のドクタブレード３
は、側端部3cが現像スリーブ１の周方向に対して傾斜す
る様に設けられ、B,C領域の内の主に磁力が低下しつつ
あるＢ領域において現像スリーブ１周面に摺接せしめら
れている。この様に、現像スリーブ１の両端部の磁力が
低下し或いは作用しない領域において、ドクタブレード
３とシール部材４を重畳させることにより、磁性トナー
Ｔの漏出を確実に防止することができる。As shown in FIGS. 9a and 9b, the doctor blade 3
Is the developing sleeve in the side edges 3c in the areas B and C where the magnetic force set in the non-image areas corresponding to the areas B and C of the magnet layer 1b on the peripheral surface of the developing sleeve 1 is reduced or does not act. It is arranged so as to be in contact with or close to 1. And from the top of this doctor blade 3,
A seal member 4 for preventing the toner T from leaking is similarly brought into contact with the developing sleeve 1 in the non-image areas B and C. That is, the doctor blade side end portion 3c and the seal member 4 overlap in the non-image areas B and C on the peripheral surface of the developing sleeve 1. Doctor blade 3 of this example
Is provided so that the side end portion 3c is inclined with respect to the circumferential direction of the developing sleeve 1, and is slidably contacted with the circumferential surface of the developing sleeve 1 in the B region where the magnetic force is mainly decreasing in the B and C regions. Has been. In this way, the magnetic toner T can be reliably prevented from leaking out by overlapping the doctor blade 3 and the seal member 4 in the regions where the magnetic forces at both ends of the developing sleeve 1 are reduced or do not act.
第１図において、現像スリーブ１の周面近傍における上
述のドクタブレード３の下流側の適所で、例えば、本例
の如くドクタブレード３の配設位置の反対側では、回動
自在に配設されている無端状の感光体ベルト５と現像ス
リーブ１とが転動接触し、現像スリーブ１表面にに担持
されたトナー薄層T1が感光体ベルト５の表面に供給され
る。感光体ベルト５は、ベルト状の導電性基体に光導電
性物質から成る感光層が積層されており、適所で一様帯
電，像露光の夫々の工程を経て静電潜像が形成された
後、本発明の現像装置の配設位置Ｄに到達し、ここで上
記トナー薄層T1の供給を受け、静電潜像が可視像化され
る。In FIG. 1, the developing sleeve 1 is rotatably arranged at an appropriate position on the downstream side of the doctor blade 3 in the vicinity of the peripheral surface thereof, for example, on the side opposite to the arrangement position of the doctor blade 3 as in this example. The endless photosensitive belt 5 and the developing sleeve 1 make rolling contact with each other, and the thin toner layer T 1 carried on the surface of the developing sleeve 1 is supplied to the surface of the photosensitive belt 5. The photoconductor belt 5 has a photosensitive layer made of a photoconductive material laminated on a belt-shaped conductive substrate, and after an electrostatic latent image is formed through the steps of uniform charging and image exposure at appropriate places. The toner reaches the position D where the developing device of the present invention is disposed, and the toner thin layer T 1 is supplied thereto, and the electrostatic latent image is visualized.
効 果 以上、詳述した如く、本発明によれば、磁界発生手段を
備えた現像剤搬送体の現像剤搬送方向に対する側端部表
面に磁力が低下し若しくは作用しない領域を設けること
により、磁性現像剤の側端部方向への移動が抑制され側
端部からの磁性現像剤の漏出を容易に防止することがで
きる。従って、その側端部領域を非画像領域に設定する
と共にこの領域で層厚規制部材とシール部材を重畳させ
れば、画像形成に悪影響を及ぼすことなく磁性現像剤の
漏出を確実に防止することができる。尚、本発明は上記
の特定の実施例に限定されるものではなく、本発明の技
術的範囲内において種々の変形が可能であることは勿論
である。例えば、現像剤搬送体としては、フロート電極
層を有しない現像スリーブ或いは微細着磁型ではなく通
常に着磁されたマグネット層を有する現像スリーブでも
良い。Effect As described above in detail, according to the present invention, by providing a region where the magnetic force is reduced or does not act on the surface of the side end portion of the developer transport body provided with the magnetic field generating means in the developer transport direction, It is possible to prevent the developer from moving toward the side end portion and easily prevent the magnetic developer from leaking from the side end portion. Therefore, if the side end region is set as a non-image region and the layer thickness regulating member and the sealing member are overlapped in this region, leakage of the magnetic developer can be surely prevented without adversely affecting image formation. You can The present invention is not limited to the above-mentioned specific embodiments, and it goes without saying that various modifications can be made within the technical scope of the present invention. For example, the developer carrying body may be a developing sleeve having no float electrode layer or a developing sleeve having a magnetized layer which is normally magnetized instead of the fine magnetized type.
第１図は本発明の１実施例を示した模式図、第２図は本
発明の１実施例におけるマグネット層の着磁構成を示し
た説明図、第３図は本発明の１実施例におけるマグネッ
ト層の製造方法を示した斜視図、第４図は本発明の１実
施例におけるマグネット層の磁力分布を示したグラフ
図、第５図は着磁構成の１変形例を示した説明図、第6a
図及び第6b図は夫々着磁構成の他の変形例を示した各説
明図、第7a図及び第7b図は夫々着磁構成の更に他の変形
例を示した説明図とその磁力分布を示したグラフ図、第
8a図及び第8b図は夫々着磁構成の更に他の変形例を示し
た説明図と斜視図、第9a図及び第9b図は夫々本発明の１
実施例の現像スリーブ側端部周辺の構成を示した各説明
図である。 （符号の説明） 1:現像スリーブ 1b:マグネット層 3:ドクタブレード 4:シール部材FIG. 1 is a schematic view showing one embodiment of the present invention, FIG. 2 is an explanatory view showing a magnetizing structure of a magnet layer in one embodiment of the present invention, and FIG. 3 is a view showing one embodiment of the present invention. FIG. 4 is a perspective view showing a method of manufacturing the magnet layer, FIG. 4 is a graph showing the magnetic force distribution of the magnet layer in one embodiment of the present invention, and FIG. 5 is an explanatory view showing a modification of the magnetizing configuration. No. 6a
FIGS. 6 and 6b are explanatory views showing other modified examples of the magnetized structure, and FIGS. 7a and 7b are explanatory views showing further modified examples of the magnetized structure and their magnetic force distributions. Graph diagram shown, No.
FIGS. 8a and 8b are explanatory views and perspective views showing still another modification of the magnetizing structure, and FIGS. 9a and 9b are respectively views of the present invention.
FIG. 6 is an explanatory diagram illustrating a configuration around an end portion on the developing sleeve side of the embodiment. (Explanation of symbols) 1: Development sleeve 1b: Magnet layer 3: Doctor blade 4: Seal member
───────────────────────────────────────────────────── フロントページの続き (72)発明者 荻山 宏美 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 (56)参考文献 特開 昭53−43530（ＪＰ，Ａ) 特開 昭57−32463（ＪＰ，Ａ) 特開 昭54−59943（ＪＰ，Ａ) 実開 昭54−177932（ＪＰ，Ｕ) 実開 昭58−155811（ＪＰ，Ｕ) 実開 昭55−167239（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromi Ogiyama 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (56) Reference JP-A-53-43530 (JP, A) JP-A-57 -32463 (JP, A) JP-A-54-59943 (JP, A) Actually opened 54-177932 (JP, U) Actually opened 58-155811 (JP, U) Actually opened 55-167239 (JP, U) )
Claims (5)
て供給する現像装置において、磁界発生手段と現像剤を
担持する表面部とが一体的に形成されており表面の現像
剤搬送方向に対する側端部に画像形成に関与する画像領
域の磁力よりも低磁力の低磁力領域が設定してあり磁性
現像剤を前記表面に磁力によって引かれて担持し所定経
路に沿って搬送する現像剤担持体と、前記現像剤担持体
の表面に当接又は近接して搬送されてくる磁性現像剤の
層厚を規制する層厚規制部材と、前記低磁力領域に配設
した磁性現像剤の漏出を防止するシール部材と、を有し
ており、前記磁界発生手段の磁極は現像剤担持体の表面
から1mm以内の位置に着磁されていることを特徴とする
現像装置。1. A developing device for supplying a thin layer of a magnetic developer to the surface of a latent image carrier, wherein a magnetic field generating means and a surface portion carrying the developer are integrally formed. A low magnetic force region having a lower magnetic force than the magnetic force of the image region involved in image formation is set at a side end portion with respect to the conveyance direction, and the magnetic developer is attracted to the surface by magnetic force and carried and conveyed along a predetermined path. A developer carrier, a layer thickness regulating member that regulates the layer thickness of the magnetic developer that is conveyed in contact with or close to the surface of the developer carrier, and a magnetic developer disposed in the low magnetic force region. And a seal member for preventing the leakage of the magnetic field, and the magnetic pole of the magnetic field generating means is magnetized at a position within 1 mm from the surface of the developer carrier.
力領域を画像形成に関与しない非画像領域とすることを
特徴とする現像装置。2. A developing device according to claim 1, wherein the low magnetic force region is a non-image region not involved in image formation.
規制部材の側端部と前記シール部材を重畳させることを
特徴とする現像装置。3. The developing device according to claim 1, wherein a side end portion of the layer thickness regulating member and the seal member are overlapped with each other.
発生手段は多数の微細磁極が表面部に着磁されたマグネ
ット層であることを特徴とする現像装置。4. The developing device according to claim 1, wherein the magnetic field generating means is a magnet layer having a large number of fine magnetic poles magnetized on its surface.
は前記現像搬送体の表面に3mm以内の間隔で着磁されて
いることを特徴とする現像装置。5. The developing device according to claim 4, wherein the magnetic poles are magnetized on the surface of the developing and conveying body at intervals of 3 mm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59104471A JPH0690573B2 (en) | 1984-05-25 | 1984-05-25 | Development device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59104471A JPH0690573B2 (en) | 1984-05-25 | 1984-05-25 | Development device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8292568A Division JP2771967B2 (en) | 1996-11-05 | 1996-11-05 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60249174A JPS60249174A (en) | 1985-12-09 |
| JPH0690573B2 true JPH0690573B2 (en) | 1994-11-14 |
Family
ID=14381496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59104471A Expired - Lifetime JPH0690573B2 (en) | 1984-05-25 | 1984-05-25 | Development device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0690573B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6338969A (en) * | 1986-08-04 | 1988-02-19 | Fuji Xerox Co Ltd | Developing device |
| EP0446034B1 (en) * | 1990-03-09 | 2000-09-06 | Seiko Epson Corporation | Development apparatus |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52140334A (en) * | 1976-05-19 | 1977-11-22 | Hitachi Metals Ltd | Electrostatic image developing apparatus |
| JPS5937828B2 (en) * | 1976-10-01 | 1984-09-12 | キヤノン株式会社 | Development method |
| JPS5459943A (en) * | 1977-10-21 | 1979-05-15 | Canon Inc | Developing device |
| JPS54177932U (en) * | 1978-06-03 | 1979-12-15 | ||
| JPS5565977A (en) * | 1978-11-10 | 1980-05-17 | Canon Inc | Magnetic powder conveyor |
| JPS6230033Y2 (en) * | 1979-05-17 | 1987-08-01 | ||
| JPS5732463A (en) * | 1980-08-06 | 1982-02-22 | Fuji Xerox Co Ltd | Developing device |
| JPS58155811U (en) * | 1982-04-12 | 1983-10-18 | 株式会社リコー | magnet troller |
-
1984
- 1984-05-25 JP JP59104471A patent/JPH0690573B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60249174A (en) | 1985-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |