JPH0421881A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH0421881A JPH0421881A JP2127404A JP12740490A JPH0421881A JP H0421881 A JPH0421881 A JP H0421881A JP 2127404 A JP2127404 A JP 2127404A JP 12740490 A JP12740490 A JP 12740490A JP H0421881 A JPH0421881 A JP H0421881A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- layer
- developing roller
- blade
- magnetic
- 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
- 230000005415 magnetization Effects 0.000 claims abstract description 34
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 239000000696 magnetic material Substances 0.000 claims description 4
- 230000004907 flux Effects 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract 1
- 239000010409 thin film Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 70
- 229920001971 elastomer Polymers 0.000 description 9
- 239000005060 rubber Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、一成分磁性トナーを使用する現像装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing device that uses a one-component magnetic toner.
［従来の技術］
従来の現像装置は、ＵＳＰ−４８５１８７４に開示され
るように、シャフト等の基体の外周に導電層を設け、さ
らにその外周にゴム磁石を設けた現像ローラーと、その
外周に圧接されたブレードとを備え、ブレードによって
トナーの層厚を規制しつつ、現像ローラーの回転により
一成分磁性トナーを搬送し、潜像担持体に現像するもの
であった。[Prior Art] As disclosed in USP-4851874, a conventional developing device includes a developing roller having a conductive layer provided on the outer periphery of a base body such as a shaft, and further provided with a rubber magnet on the outer periphery, and a developing roller in pressure contact with the outer periphery. The one-component magnetic toner is conveyed by rotation of a developing roller and developed onto a latent image carrier while regulating the layer thickness of the toner by the blade.
［発明が解決しようとする課題］
しかし、前述の従来技術において、射出成形もしくは押
し出し成形では、表面のゴム磁石を薄くすることができ
ないが、ブレードでトナーを均一薄層にするためにはゴ
ム磁石の磁化反転ピッチを小さくしなければならず、十
分大きな磁束密度を発生させながら、微小磁化反転ピッ
チに着磁するためにはゴム磁石が薄くなければならない
という矛盾を有していた。すなわち、比較的厚いゴム磁
石に微小間隔の着磁を施すと、ゴム磁石内部の、ゴム磁
石表面から浅い部分で磁力線が閉じてしまい、着磁後の
ゴム磁石表面には十分な磁束密度が得られにくい。従っ
て、従来の技術では、磁化反転ピッチの間隔を十分に微
小化できず、ブレードで規制される前のトナー層には、
磁化反転ビッヂに相当する層厚のムラが存在し、ブレー
ドではトナー層を均一化しきれずに、層厚にムラを残し
たままトナーは現像領域に搬送され、現像時に流度ムラ
を発生さぜるという問題点を有していた。[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, injection molding or extrusion molding cannot make the rubber magnet on the surface thin, but in order to make the toner into a uniform thin layer with a blade, it is difficult to make the rubber magnet thin. The magnetization reversal pitch of the magnetization reversal pitch must be made small, and there is a contradiction in that the rubber magnet must be thin in order to be magnetized to a minute magnetization reversal pitch while generating a sufficiently large magnetic flux density. In other words, when a relatively thick rubber magnet is magnetized at minute intervals, the lines of magnetic force close inside the rubber magnet at a shallow depth from the surface of the rubber magnet, resulting in insufficient magnetic flux density on the surface of the rubber magnet after magnetization. Hard to get caught. Therefore, with the conventional technology, it is not possible to make the magnetization reversal pitch sufficiently small, and the toner layer before being regulated by the blade has
There is an unevenness in the layer thickness corresponding to the magnetization reversal bit, and the blade is unable to make the toner layer uniform, and the toner is conveyed to the developing area with the uneven layer thickness remaining, causing flow rate unevenness during development. The problem was that
さらに、最小磁化反転ピッチを小さくできないため、比
較的長いトナーチエインがブレードまで搬送され、ブレ
ードで穂切るトナー量が多く、従ってブレードの当接圧
を大きく設定する必要がある。その結果、現像ローラー
とトナーとブレードの摩擦が大きくなり、ブレードの発
熱とトナー付着という問題点も有していた。Furthermore, since the minimum magnetization reversal pitch cannot be made small, a relatively long toner chain is conveyed to the blade, and the amount of toner cut by the blade is large, so it is necessary to set the contact pressure of the blade to be large. As a result, friction between the developing roller, toner, and blade increases, resulting in problems such as heat generation and toner adhesion to the blade.
さらに、過大なトナー層を穂切り、ムラを均一化するた
めには、ブレードの形状、材質、接触圧等の設定が制限
を受け、環境変動や長期耐久における信頼性の低い現像
装置になってしまうという問題点を有している。Furthermore, in order to trim the excessive toner layer and make the unevenness uniform, there are restrictions on the settings of the blade shape, material, contact pressure, etc., making the developing device unreliable in terms of environmental fluctuations and long-term durability. It has the problem of being stored away.
そこで本発明はこのような問題点を解決するもので、そ
の目的とするところは、安定した均一薄層のトナーを現
像領域に供給することができ、成分磁性トナーで流度ム
ラのない良好な現像を可能にする現像装置を提供すると
ころにある。また他の目的は、ブレードの当接圧を低く
設定することができ、ブレードの発熱とトナー付着とい
う現象の起こらない現像装置を提供するところにある。The present invention is intended to solve these problems.The purpose of the present invention is to be able to supply a stable, uniform thin layer of toner to the development area, and to provide a good, uniform flow rate with component magnetic toner. An object of the present invention is to provide a developing device that enables development. Another object of the present invention is to provide a developing device in which the contact pressure of the blade can be set low and the phenomena of heat generation and toner adhesion to the blade do not occur.
更に他の目的は、環境変動や長期耐久における信頼性の
高い現像装置を提供するところにある。Still another object is to provide a developing device that is highly reliable in the face of environmental changes and long-term durability.
［課題を解決するための手段］
本発明の現像装置は、ブレードで層厚を規制した一成分
磁性トナーを、現像ローラーで保持および搬送し、一成
分磁性トナーを潜像担持体に現像する現像装置において
、現像ローラーが、最小磁化反転ピッチが５００［μｍ
］以下である磁界発主層を有し、現像ローラーとブレー
ドのうち少なくともどちらか一方が弾性を有し、互いに
圧接された部分で一成分磁性トナーの層厚を規制するこ
とを特徴とする。[Means for Solving the Problems] The developing device of the present invention is a developing device that holds and conveys a mono-component magnetic toner whose layer thickness is regulated by a blade using a developing roller, and develops the mono-component magnetic toner onto a latent image carrier. In the apparatus, the developing roller has a minimum magnetization reversal pitch of 500 μm.
] It is characterized in that it has the following magnetic field generating layer, at least one of the developing roller and the blade has elasticity, and the layer thickness of the one-component magnetic toner is regulated at the portions that are pressed against each other.
また、本発明の現像装置は、ブレードが少なくとも軟磁
性材料を構成要素とすることを特徴とする。Further, the developing device of the present invention is characterized in that the blade has at least a soft magnetic material as a component.
［作用］
本発明の上記の構成によれば、薄層で微小ピッチの着磁
を施した磁界発生層の表面近傍でトナーを搬送するため
、そもそもトナーは過剰に保持されることはない。すな
わち、磁化反転ピッチが狭くなると、一方の極を出発点
とし他方の極まで導かれる磁力線が、磁界発生層表面近
傍で閉じるため、その磁力線に捕らえられ保持されるト
ナーの層は薄いものになる。トナーの粒径前後の磁化反
転ピッチで着磁すると、磁力線がトナーのほぼ一層で閉
じるため、トナーはぼ一層を保持することも可能である
。従って、ブレードで穂切る以前の搬送で、ある程度の
トナー薄層化が可能でるため、現像ローラーにソフトに
圧接されたブレードでソフトにトナーを穂切り、均一薄
層化することが可能であり、また同時に、ブレードの設
定に余裕ができ、環境変動、長期耐久において信頼性の
高い現像ローラーを得ることができる。すなわち、現像
ローラー上に均一で薄層のトナー層（或は微小ピッチの
磁気ブラシ薄層）を形成することができ、トナー層厚の
変動による流度ムラ等を低減し、高解像の現像を行うこ
とができる。[Function] According to the above configuration of the present invention, since toner is transported near the surface of the magnetic field generation layer which is thin and magnetized at a minute pitch, toner is not retained in excess in the first place. In other words, as the magnetization reversal pitch becomes narrower, the lines of magnetic force that start from one pole and are guided to the other pole close near the surface of the magnetic field generation layer, so the toner layer that is captured and held by the lines of magnetic force becomes thinner. . When magnetized with a magnetization reversal pitch around the particle size of the toner, the lines of magnetic force are closed in almost one layer of toner, so it is possible to hold almost one layer of toner. Therefore, it is possible to thin the toner layer to some extent during transportation before cutting the toner with the blade, so it is possible to cut the toner into a uniform thin layer by gently cutting the toner with the blade that is softly pressed against the developing roller. At the same time, it is possible to obtain a developing roller that has a high degree of reliability in terms of environmental fluctuations and long-term durability because it allows for more leeway in the blade settings. In other words, it is possible to form a uniform and thin toner layer (or a thin magnetic brush layer with a minute pitch) on the developing roller, reducing flow rate unevenness caused by variations in toner layer thickness, and achieving high resolution development. It can be performed.
また、本発明の上記の構成によれば、弾性層を設けるこ
とで、非接触現像、接触現像、ベルト状潜像担持体、ド
ラム状の潜像担持体いずれにおいても、現像ローラー上
に均一で薄層のトナー層を形成して、現像ローラー上の
トナー層厚の変動による温度変動を低減することができ
る。Further, according to the above structure of the present invention, by providing the elastic layer, the elastic layer can be uniformly distributed on the developing roller in any of non-contact development, contact development, belt-shaped latent image carrier, and drum-shaped latent image carrier. A thin toner layer can be formed to reduce temperature fluctuations due to variations in toner layer thickness on the developer roller.
また、ブレードを軟磁性材料を用いて構成することで、
ブレードが磁界発生層に起因する磁気力で現像ローラー
に圧接され、ブレードの構成が簡単になり、しかも当接
圧を均一にし、より簡単にトナーを均一薄層化して、流
度ムラのない高画質な画像が得られる。In addition, by constructing the blade using soft magnetic material,
The blade is pressed against the developing roller by the magnetic force generated by the magnetic field generation layer, which simplifies the configuration of the blade and makes the contact pressure uniform, making it easier to form a uniform thin layer of toner and achieving high flow rates with no unevenness. You can obtain high quality images.
以下、実施例により本発明の詳細を示す。Hereinafter, the details of the present invention will be shown by examples.
［実施例］
第１図は、本発明の現像装置の実施例における断面概観
図である。磁性のトナー１を搬送する現像ローラー２は
、導電性を有する基体３の外周に、弾性層４および磁気
塗料を塗布して形成された厚さ約１０しμｍ］の磁界発
生層５をそれぞれ同心円状に配設し、長手方向のライン
着磁を磁化反転ピッチ約１００［μｍ］で行ったもので
、磁界発生層５外周の漏洩磁束により磁性のトナー１を
直接保持し、現像装置ケース１２に一端が固定されもう
一方の端部付近で現像ローラー２に圧接されている、薄
板バネ状の弾性ブレード６で適量に規制した状態で現像
ローラー２を回転させて薄層のトナー１を搬送するもの
である。弾性ブレード６はトナー層厚を規制すると同時
に、トナー１に摩擦帯電電荷を与え、トナーの帯電量を
高める。トナー１は、支持電極７上に静電像保持層８を
形成した潜像担持体９と現像ローラー２とが、トナー１
の層厚よりも狭い間隙で配置された現像領域まで搬送さ
れ、トナー層は潜像担持体９に接する。[Example] FIG. 1 is a cross-sectional schematic diagram of an example of the developing device of the present invention. The developing roller 2 that conveys the magnetic toner 1 has an elastic layer 4 and a magnetic field generating layer 5 with a thickness of about 10 μm formed by coating a magnetic paint on the outer periphery of a conductive base 3, respectively, in concentric circles. The magnetic toner 1 is directly held by the leakage magnetic flux around the outer periphery of the magnetic field generating layer 5, and is magnetized in the longitudinal direction with a magnetization reversal pitch of approximately 100 [μm]. A device that conveys a thin layer of toner 1 by rotating the developing roller 2 while regulating the appropriate amount with a thin plate spring-like elastic blade 6 that is fixed at one end and pressed against the developing roller 2 near the other end. It is. The elastic blade 6 regulates the toner layer thickness and at the same time applies triboelectric charge to the toner 1 to increase the amount of charge of the toner. Toner 1 is produced by a latent image carrier 9 having an electrostatic image holding layer 8 formed on a supporting electrode 7 and a developing roller 2.
The toner layer is conveyed to a developing area arranged with a gap narrower than the layer thickness, and the toner layer comes into contact with the latent image carrier 9.
さらに、トナー１は、潜像担持体９の電位コン）・ラス
トおよび、現像バイアス印加手段１０により、潜像担持
体９の支持電極７と現像ローラー２の弾性層４間に印加
されたバイアスにより形成される現像電界に応じて、潜
像担持体９に付着し静電潜像が顕像化される。Furthermore, the toner 1 is applied by the potential contrast of the latent image carrier 9 and the bias applied between the supporting electrode 7 of the latent image carrier 9 and the elastic layer 4 of the developing roller 2 by the developing bias applying means 10. Depending on the developing electric field that is formed, the electrostatic latent image adheres to the latent image carrier 9 and becomes visible.
第１図に示されるような現像装置を用いて、６００［Ｄ
Ｐ工］のライン潜像および文字潜像およびソリッド潜像
を１００００枚にわたり連続現像したところ、６００［
ＤＰＩ］のライン画像が線太りすることなく安定して形
成され、画像端部の尾引きや地力ブリがなく、ＯＤ値１
．４以上の高濃度で温度ムラのないソリッド画像を安定
して形成することができた。Using a developing device as shown in FIG.
When line latent images, character latent images, and solid latent images of 10,000 sheets were continuously developed, 600
DPI] line image is stably formed without line thickening, there is no tailing or blurring at the edge of the image, and the OD value is 1.
．． It was possible to stably form a solid image with a high density of 4 or more and no temperature unevenness.
第１図の実施例において、弾性層４は、天然ゴム、シリ
コンゴム、ウレタンゴム、ブタジェンゴム、クロロプレ
ンゴム、ネオブレンゴム、ＮＢＲ′を
等の物質で構成することができる。また、弾性層４の形
態としては、ゴム、発泡体、スポンジ等の形態が可能で
あり、厚さは５００［μｍ１以上であることが望ましい
。また、磁界発生層５は、磁気記録材料や磁石材料とし
て公知の磁性粉を、添加剤とともにバインダ溶液中に分
散させて磁気塗料を塗布して形成される。このとき、磁
界発生層５の厚さは、１００［μｍ］以下であり、望ま
しくは１０［μｍ］程度である。また、弾性ブレード６
は、板状の金属や、トナーに所望の極性の電荷を与える
絶縁性物質、例えばポリスエステル系の負帯電トナーな
らばＰＭＭＡ等の物質でも、金属の表面を絶縁性の物質
で被覆した物、また絶縁性の物質の表面に金属をメツキ
した物であってもよい。弾性ブレード６は非磁性でもで
も構わないが、パーマロイ等の軟磁性の材料を用いると
、磁界発生層５の磁界に引きつけられて現像ローラー２
に圧接されるため、弾性ブレード６を機械的に圧接させ
る必要がなく、位置精度が低くても構成できる。また、
弾性ブレード６を導電性の物質で＝ ６
構成した場合、所定のバイアスを印加すると、トナー１
の帯電量が安定する。さらにまた、本発明に使用するト
ナーとしては、一成分磁性のトナーとして公知の全ての
トナーを使用することができ、レジン系トナー ワック
ス系トナーの何れでも良い。現像剤の組成は、公知のよ
うに、樹脂に磁性粉や着色剤や外添剤やその他の添加剤
を加えたもので、粉砕法や重合法等で作成される。In the embodiment of FIG. 1, the elastic layer 4 may be made of natural rubber, silicone rubber, urethane rubber, butadiene rubber, chloroprene rubber, neoprene rubber, NBR', or the like. Further, the elastic layer 4 can be in the form of rubber, foam, sponge, etc., and preferably has a thickness of 500 μm or more. The magnetic field generating layer 5 is formed by dispersing magnetic powder known as a magnetic recording material or magnet material in a binder solution together with additives and applying a magnetic paint. At this time, the thickness of the magnetic field generation layer 5 is 100 [μm] or less, preferably about 10 [μm]. In addition, the elastic blade 6
is a plate-shaped metal or an insulating material that gives the toner a desired polar charge, such as a material such as PMMA for negatively charged polyester toner; Alternatively, it may be an insulating material plated with metal on the surface. The elastic blade 6 may be non-magnetic, but if a soft magnetic material such as permalloy is used, it will be attracted by the magnetic field of the magnetic field generation layer 5 and the developing roller 2
Since the elastic blade 6 is pressed into contact with the elastic blade 6, there is no need to mechanically contact the elastic blade 6 with pressure, and the configuration can be made even if the positional accuracy is low. Also,
When the elastic blade 6 is made of a conductive material = 6, when a predetermined bias is applied, the toner 1
The amount of charge becomes stable. Furthermore, as the toner used in the present invention, all known one-component magnetic toners can be used, including resin-based toners and wax-based toners. As is well known, the composition of the developer is a mixture of resin, magnetic powder, colorant, external additives, and other additives, and is produced by a pulverization method, a polymerization method, or the like.
また、本発明の現像装置における現像ローラーは、少な
くとも、磁界発生層を構成要素として含み、現像ローラ
ーに弾性をもたせる弾性層、現像電極効果を得る導電層
、ローラーの強度を確保する基体、およびトナーの帯電
性を向上する絶縁層を、単独もしくは複数組み合わせて
加えることが可能である。またその弛に、保護層を配設
して耐久性を向上したり、中間層を配設して成形性を向
上することができ、さらに、複数層の機能を融合して一
層とする構成も可能である。また、磁界発生層の着磁状
態は、ライン状着磁や格子状着磁や螺旋状着磁等の様々
な着磁状態にして使用することができ、着磁は現像ロー
ラーに直接行っても、予め着磁を施したフィルム状の磁
界発生層を現像ローラーに接着等の手段により適宜配設
しても良い。Further, the developing roller in the developing device of the present invention includes at least a magnetic field generating layer as a component, an elastic layer that provides elasticity to the developing roller, a conductive layer that provides a developing electrode effect, a base that ensures the strength of the roller, and a toner. It is possible to add an insulating layer that improves the charging property of the insulating layer singly or in combination. In addition, a protective layer can be provided to improve durability, an intermediate layer can be provided to improve moldability, and even a structure that combines the functions of multiple layers into a single layer is also possible. It is possible. In addition, the magnetic field generation layer can be used in various magnetized states such as line magnetization, grid magnetization, and spiral magnetization, and magnetization can be performed directly on the developing roller. Alternatively, a magnetic field generating layer in the form of a film that has been magnetized in advance may be appropriately disposed on the developing roller by means such as adhesion.
尚、第１図において、図中の構成のみで本発明を限定す
るものではない。また、矢印はそれぞれの部材の回転方
向を示すが本発明を限定するものではない。さらに、潜
像担持体９はベルト状の形態でも可能であり、現像方法
も、正規現像、反転現像の別を問うことなく使用するこ
とができる。In addition, in FIG. 1, the present invention is not limited only to the configuration shown in the figure. Further, although the arrows indicate the rotation direction of each member, this does not limit the present invention. Furthermore, the latent image carrier 9 can also be in the form of a belt, and the developing method can be used regardless of whether it is regular development or reversal development.
第２図は本発明の他の実施例におけるブレードの圧接状
態を示す図である。第２図に示すようにブレード２６の
エツジ部を現像ローラー２２に圧接すると、薄層化が効
率的に行われる。第１図に示した圧接状態と、第２図に
示した圧接状態いずれにおいても、ブレードの厚さは均
一でなくてもよい。例えば、現像ローラーに接触する側
を薄くすることで、現像ローラー側でより大きくたわみ
、現像ローラーに対する当接がスムースになる。FIG. 2 is a diagram showing a state in which the blades are in pressure contact in another embodiment of the present invention. When the edge portion of the blade 26 is brought into pressure contact with the developing roller 22 as shown in FIG. 2, thinning can be efficiently achieved. The thickness of the blade does not have to be uniform in both the press-contact state shown in FIG. 1 and the press-contact state shown in FIG. For example, by making the side in contact with the developing roller thinner, the developing roller side is deflected more and the contact with the developing roller becomes smoother.
第３図は本発明のさらに他の実施例におけるブレードの
圧接状態を示す図である。第３図において、弾性率の低
いシリコンゴムを構成要素とした現像ローラー３２に弾
性率の高いフッ素樹脂で構成されたブレード３６を押し
当てる組合せとなっている。本実施例では、ブレード３
６が、現像ローラー３２を変形させて圧接し、簡単な構
造でトナー１を均一薄層化することができる。FIG. 3 is a diagram showing a state in which the blades are in pressure contact in still another embodiment of the present invention. In FIG. 3, a blade 36 made of a fluororesin having a high modulus of elasticity is pressed against a developing roller 32 made of silicone rubber having a low modulus of elasticity. In this embodiment, the blade 3
6 deforms and presses the developing roller 32, and the toner 1 can be made into a uniform thin layer with a simple structure.
第４図は、本発明の現像装置における、磁界発生層の最
小磁化反転ピッチに対するトナー層厚を示す図である。FIG. 4 is a diagram showing the toner layer thickness with respect to the minimum magnetization reversal pitch of the magnetic field generation layer in the developing device of the present invention.
第４図において、横軸は磁界発生層の最小磁化反転ピッ
チであり、縦軸は光学的に測定した、層厚規制された、
現像ローラー上のトナー層厚を表している。第４図中の
曲線は、測定されたトナー層厚で、最も薄い部分の厚さ
４１および最も厚い部分の厚さ４２である。トナー搬送
量ムラである、最も厚い部分の厚さ４２から最も薄い部
分の厚さ４１を差し引いた厚さは、最小磁化反転ピッチ
を狭くすると明らかに少なくなり、５００［μｍ］以下
の最小磁化反転ピッチでは、ブレードによる薄層化が効
率よく行われ、トナー−１１＝
搬送量ムラは極めて少なくなっている。最小磁化反転ピ
ッチが広い場合の、ブレードによるトナー層厚規制を観
察すると、磁極に同期してブレードが振動し、均一化し
きれないままトナーを通している様子が観察された。さ
らに、最小磁化反転ピッチ５００［μｍ］以下の現像ロ
ーラーで現像した画像を記録紙に転写および定着した画
像は、目視で濃度ムラが認識できない程度に向上するこ
とができた。In FIG. 4, the horizontal axis is the minimum magnetization reversal pitch of the magnetic field generation layer, and the vertical axis is the optically measured layer thickness regulated.
It represents the toner layer thickness on the developing roller. The curves in FIG. 4 are the measured toner layer thicknesses, the thinnest part thickness 41 and the thickest part thickness 42. The thickness obtained by subtracting the thickness 41 of the thinnest part from the thickness 42 of the thickest part, which is the unevenness of the toner conveyance amount, clearly decreases when the minimum magnetization reversal pitch is narrowed, and the minimum magnetization reversal of 500 [μm] or less Regarding the pitch, thinning by the blade was performed efficiently, and the unevenness in the amount of toner conveyed was extremely small. When observing the regulation of toner layer thickness by the blade when the minimum magnetization reversal pitch is wide, it was observed that the blade vibrates in synchronization with the magnetic pole and passes through the toner without being completely uniform. Furthermore, an image developed with a developing roller having a minimum magnetization reversal pitch of 500 [μm] or less was transferred and fixed onto a recording paper, and the image was improved to such an extent that density unevenness could not be visually recognized.
従って、均一薄層のトナー層を形成するためには、最小
磁化反転ピッチを５００［μｍ］以下とすることによっ
て、トナーをムラなく搬送し安定した画像濃度を得るこ
とができる。尚、磁化方向と略同一方向に隣接するの磁
化の反転ピッチを微小化しても、磁化方向と略垂直方向
に隣接する磁化の反転ピッチを微小化しても、その他任
意の方向に微小化してもトナー層を安定して薄層化しム
ラなく搬送することができる。Therefore, in order to form a uniformly thin toner layer, by setting the minimum magnetization reversal pitch to 500 [μm] or less, the toner can be conveyed evenly and a stable image density can be obtained. Furthermore, even if the reversal pitch of the magnetization adjacent to the magnetization direction is made smaller, the reversal pitch of the magnetization adjacent to the magnetization direction is made smaller, or the reversal pitch of the magnetization adjacent to the magnetization direction is made smaller, or it is made smaller in any other direction. The toner layer can be stably thinned and conveyed evenly.
以上実施例を述べたが、本発明は以上の実施例のみなら
ず、広く電子写真等の現像装置に応用することかでき、
特にプリンターや複写機やファクシミリやデイスプレー
に応用すれば有効である。Although the embodiments have been described above, the present invention can be applied not only to the above embodiments but also to a wide range of developing devices such as electrophotography.
It is especially effective when applied to printers, copiers, facsimiles, and displays.
［発明の効果］
以上述べたように本発明によれば、微小磁化反転ピッチ
に着磁した磁界発生層を有する現像ローラー上に保持し
たトナーを、現像ローラーに圧接されたブレードで薄層
化することにより、構造が簡単で小型低コストの現像装
置でありながら、トナーの搬送量が均一薄層で、濃度ム
ラの少ない画像を安定して形成できるという効果を有す
る。特に、微小ピッチの磁界を形成しトナーを均一かつ
十分な保持力で現像ローラー上に保持することによって
、ブレードでの薄層化が容易になり、ブレードの位置や
弾性率などの設定の許容範囲が広がるため、環境変動、
長期耐久に対してトナー搬送量を安定させることができ
、接触現像、圧接現像の何れにも対応可能な信頼性の高
い現像装置が提供可能である。[Effects of the Invention] As described above, according to the present invention, the toner held on the developing roller having the magnetic field generation layer magnetized to a minute magnetization reversal pitch is made into a thin layer by the blade pressed against the developing roller. As a result, although the developing device has a simple structure and is small and low cost, it has the effect of stably forming an image with a uniform thin layer of toner conveyed and less density unevenness. In particular, by forming a magnetic field with a minute pitch and holding the toner on the developing roller with uniform and sufficient holding force, it is easy to thin the toner with the blade, and the allowable range of settings such as blade position and elastic modulus environmental changes,
It is possible to provide a highly reliable developing device that can stabilize the amount of toner conveyance for long-term durability and is compatible with both contact development and pressure development.
また、弾性層を設けることで、ベルト状の潜像担持体だ
けでなく、ドラム状の潜像担持体にも、接触もしくは圧
接現像が可能な現像装置が提供可能である。Furthermore, by providing an elastic layer, it is possible to provide a developing device that can perform contact or pressure development not only on a belt-shaped latent image carrier but also on a drum-shaped latent image carrier.
また、ブレードに磁性を持たせ、磁気力によって現像ロ
ーラーにブレードを圧接することで、ブレードの機械精
度が低くても均一なＩ・ナー薄層が形成でき、簡単な構
造で温度ムラの少ない高画質な画像が得られる現像装置
を提供できるという効果を有する。In addition, by imparting magnetism to the blade and pressing the blade against the developing roller using magnetic force, a uniform thin layer of I-ner can be formed even if the mechanical precision of the blade is low. This has the effect of providing a developing device that can produce high-quality images.
従って、本発明の現像装置は、一成分磁性現像法におい
て、濃度ムラが少なく高解像の画像が得られる現像装置
を提供できるという優れた効果を有するものである。Therefore, the developing device of the present invention has an excellent effect in that it can provide a developing device that can obtain high-resolution images with little density unevenness in the one-component magnetic development method.
第１図は本発明の現像装置の実施例における断面概観図
であり、第２図は本発明の弛の実施例におけるブレード
の圧接状態を示す図であり、第３図は本発明のさらに弛
の実施例におけるブレードの圧接状態を示す図であり、
第４図は、本発明の現像装置における、磁界発生層の最
小磁化反転ピッチに対する
１ ・・・
２ ・・・
４ ・・・
５ ・・・
６ ・・・
９ ・・・
トナー層厚を示す図である。
トナー
現像ローラー
弾性層
磁界発生層
弾性ブレード
潜像担持体
出願人 セイコーエプソン株式会社
代理人 弁理士 鈴木 喜三部（化１名）磁極間隔
〈μｍ〉FIG. 1 is a schematic cross-sectional view of an embodiment of the developing device of the present invention, FIG. 2 is a diagram showing a state of pressure contact of the blade in the embodiment of the loosening mechanism of the present invention, and FIG. It is a figure showing the pressure contact state of the blade in the example of
FIG. 4 shows the toner layer thickness of 1...2...4...5...6...9... with respect to the minimum magnetization reversal pitch of the magnetic field generation layer in the developing device of the present invention. It is a diagram. Toner developing roller Elastic layer Magnetic field generating layer Elastic blade Latent image carrier Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki (1 person) Magnetic pole spacing <μm>
Claims (2)
現像ローラーで保持および搬送し、前記一成分磁性トナ
ーを潜像担持体に現像する現像装置において、 前記現像ローラーが、最小磁化反転ピッチが５００［μ
ｍ］以下である磁界発生層を有し、前記現像ローラーと
前記ブレードのうち少なくともどちらか一方が弾性を有
し、互いに圧接された部分で前記一成分磁性トナーの層
厚を規制することを特徴とする現像装置。(1) One-component magnetic toner whose layer thickness is controlled by a blade,
In a developing device that develops the one-component magnetic toner onto a latent image carrier by holding and transporting it with a developing roller, the developing roller has a minimum magnetization reversal pitch of 500 [μ
m] or less, at least one of the developing roller and the blade has elasticity, and the layer thickness of the one-component magnetic toner is regulated at the portions that are pressed against each other. A developing device.
とすることを特徴とする請求項１記載の現像装置。(2) The developing device according to claim 1, wherein the blade comprises at least a soft magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2127404A JP2847898B2 (en) | 1990-05-17 | 1990-05-17 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2127404A JP2847898B2 (en) | 1990-05-17 | 1990-05-17 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0421881A true JPH0421881A (en) | 1992-01-24 |
| JP2847898B2 JP2847898B2 (en) | 1999-01-20 |
Family
ID=14959152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2127404A Expired - Fee Related JP2847898B2 (en) | 1990-05-17 | 1990-05-17 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2847898B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6348789B1 (en) | 1996-07-31 | 2002-02-19 | Ando Electric Co., Ltd. | Testboard for IC tester |
| US8872535B2 (en) | 2008-11-04 | 2014-10-28 | Advantest Corporation | Connector attaching/detaching apparatus and test head |
-
1990
- 1990-05-17 JP JP2127404A patent/JP2847898B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6348789B1 (en) | 1996-07-31 | 2002-02-19 | Ando Electric Co., Ltd. | Testboard for IC tester |
| US8872535B2 (en) | 2008-11-04 | 2014-10-28 | Advantest Corporation | Connector attaching/detaching apparatus and test head |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2847898B2 (en) | 1999-01-20 |
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