JPH045985B2 - - Google Patents
Info
- Publication number
- JPH045985B2 JPH045985B2 JP57111763A JP11176382A JPH045985B2 JP H045985 B2 JPH045985 B2 JP H045985B2 JP 57111763 A JP57111763 A JP 57111763A JP 11176382 A JP11176382 A JP 11176382A JP H045985 B2 JPH045985 B2 JP H045985B2
- Authority
- JP
- Japan
- Prior art keywords
- toner
- magnetic
- developer
- latent image
- particle size
- 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
- 239000006249 magnetic particle Substances 0.000 claims description 31
- 239000002245 particle Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000006247 magnetic powder Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 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
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0812—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer regulating means, e.g. structure of doctor blade
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/06—Developing structures, details
- G03G2215/0602—Developer
- G03G2215/0604—Developer solid type
- G03G2215/0614—Developer solid type one-component
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/06—Developing structures, details
- G03G2215/0634—Developing device
- G03G2215/0636—Specific type of dry developer device
- G03G2215/0641—Without separate supplying member (i.e. with developing housing sliding on donor member)
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
この発明は、電子写真装置または静電記録装置
によつて、感光体または誘電体上に形成された静
電潜像を非磁性トナーのみから成る一成分現像剤
によつて可視像化する静電潜像現像方法に関す
る。Detailed Description of the Invention [Technical Field to which the Invention Pertains] The present invention is an electrostatic latent image formed on a photoreceptor or dielectric material by an electrophotographic device or an electrostatic recording device using only non-magnetic toner. The present invention relates to a method for developing an electrostatic latent image that is visualized using a one-component developer.
現像は、静電潜像を形成している電荷とは逆極
性に帯電されたトナーと呼ばれる着色微粉末が、
静電潜像に静電的に吸引されることにより行なわ
れる。現像剤としては、粉体トナーのみからなる
一成分現像剤の他に、粉体トナーとキヤリアと呼
ばれる磁性粉または樹脂、ガラス等の微細な粉末
とを混合してなる二成分現像剤とがある。二成分
現像剤においてはトナーはキヤリアとの摩擦によ
つて帯電され、トナーの帯電が確実に行なわれ
る。その反面、現像濃度を一定に維持するために
トナーとキヤリアとの混合比すなわちトナー濃度
を常に一定に維持しておかなければならない。ト
ナーのみから成る一成分現像剤は、このようなト
ナー濃度の管理が不必要でありその取扱いの簡便
さにおいて二成分現像剤に勝つている。
During development, colored fine powder called toner is charged with the opposite polarity to that forming the electrostatic latent image.
This is done by being electrostatically attracted to an electrostatic latent image. In addition to single-component developers consisting only of powdered toner, there are two-component developers consisting of a mixture of powdered toner and magnetic powder called carrier, or fine powder of resin, glass, etc. . In a two-component developer, the toner is charged by friction with the carrier, and the toner is reliably charged. On the other hand, in order to maintain a constant development density, the mixing ratio of toner and carrier, that is, the toner concentration must always be maintained constant. A one-component developer consisting only of toner does not require such management of toner concentration and is superior to a two-component developer in terms of ease of handling.
一成分現像剤は非磁性と磁性とに区別される。
非磁性トナーは一般に樹脂粉末にカーボン等の着
色剤を混合させたものであり磁性トナーは、これ
に磁性粉を混入させたものである。現像剤層の形
成が容易である等の理由から現在では磁性トナー
が多く使用されているが上述のように磁性粉を混
入しているため非磁性トナーにくらべて高価であ
り、またカラートナーを作成する場合に磁性粉が
存在するために鮮明な色が得られない等の欠点が
ある。非磁性トナーを用いるとこのような不具合
点は解決され得るが、他方磁力によつてトナーを
現像剤供与部材表面に引き寄せることができない
ためトナーの均一な層を形成することが困難であ
り、またトナーの充分な帯電も難しい。 One-component developers are classified into non-magnetic and magnetic ones.
Non-magnetic toner is generally a mixture of resin powder and a coloring agent such as carbon, and magnetic toner is a mixture of resin powder and magnetic powder. Currently, magnetic toner is widely used because it is easy to form a developer layer, but as mentioned above, it is more expensive than non-magnetic toner because it contains magnetic powder, and color toner is more expensive than non-magnetic toner. There are drawbacks such as the inability to obtain clear colors due to the presence of magnetic powder during preparation. Although the use of non-magnetic toner can solve these problems, it is difficult to form a uniform layer of toner because the toner cannot be attracted to the surface of the developer donor member by magnetic force. It is also difficult to sufficiently charge the toner.
非磁性の一成分現像剤を使用する従来の一般的
な現像装置は、現像剤層の層厚規制用部材として
剛体ブレード、弾性体ブレード等を作用してい
た。しかし剛体ブレードを使用する場合は現像剤
供与部材との間の間げきに高度な機械精度を要求
され、また凝集したトナーや異物等がこの間げき
をふさいだ場合にトナーの厚さにムラが生ずる。
弾性体ブレードを現像剤供与部材に圧接すると比
較的均一なトナーの薄層の形成が可能であるが微
視的にはやはりトナーの凝集がみられ現像像の解
像度を低下させる要因となる。また、ブレードの
圧力によつて現像剤供与部材表面にトナーが固着
するためトナーの摩擦帯電が不充分となる。さら
に圧接部においてブレードが摩耗するという欠点
があつた。 A conventional general developing device using a non-magnetic one-component developer uses a rigid blade, an elastic blade, or the like as a member for regulating the thickness of the developer layer. However, when using a rigid blade, a high level of mechanical precision is required in the gap between the blade and the developer supplying member, and if aggregated toner or foreign matter blocks this gap, uneven toner thickness will occur. .
Although it is possible to form a relatively uniform thin layer of toner by pressing the elastic blade against the developer supplying member, agglomeration of the toner is still observed microscopically, which is a factor in reducing the resolution of the developed image. Further, since the toner adheres to the surface of the developer supplying member due to the pressure of the blade, the frictional charging of the toner becomes insufficient. Furthermore, there was a drawback that the blade wore out at the pressure welding part.
このような従来方法の欠点を解決するために本
発明者は非磁性一成分現像剤の層厚規制部材とし
て磁性体粒子から成る磁気ブラシを使用する方法
を試みたが、磁性体粒子として従来の二成分現像
法に使用されている鉄粉キヤリア（粒径はトナー
の５倍から10倍）を用いると磁性体粒子間の間隙
が大きすぎるために多量のトナーの通過を許して
しまう部分が生じ、現像剤供与部材の表面に形成
されたトナー層は現像剤供与部材の移動する方向
に筋状の厚さのムラを持つたものになつてしまう
という不具合点が発生した。また、他方、磁性体
粒子の粒径を極端に小さくすると磁性体粒子が現
像剤供与部材及びトナーとの接触によつて獲得し
た摩擦帯電電荷にもとづくクーロン力が磁力に打
ち勝つ場合が生じ磁性体粒子が磁気ブラシから脱
離してゆくという欠点があつた。 In order to solve these drawbacks of the conventional method, the present inventor tried a method of using a magnetic brush made of magnetic particles as a layer thickness regulating member of a non-magnetic one-component developer, but the conventional When using the iron powder carrier used in the two-component development method (particle size is 5 to 10 times that of the toner), the gaps between the magnetic particles are too large, resulting in areas that allow a large amount of toner to pass through. However, a problem has arisen in that the toner layer formed on the surface of the developer donor member has streak-like thickness unevenness in the direction of movement of the developer donor member. On the other hand, if the particle size of the magnetic particles is extremely small, the Coulomb force based on the triboelectric charge acquired by the magnetic particles when they come into contact with the developer donor member and the toner may overcome the magnetic force. The problem was that the magnetic brush was detached from the magnetic brush.
この発明は上述した従来方法の欠点を改良した
もので、現像剤供与部材表面に凝集の少ない均一
な非磁性トナーの薄層の形成することのできる静
電潜像現像方法を提供することを第一の目的とす
る。
The present invention is an improvement over the above-mentioned drawbacks of the conventional methods, and the first object of the present invention is to provide an electrostatic latent image developing method capable of forming a uniform thin layer of non-magnetic toner with little aggregation on the surface of a developer-donating member. The first purpose.
この発明の第二の目的は、現像剤供与部材表面
に充分に帯電した非磁性トナーの薄層を形成する
ことのできる静電潜像現像方法を提供することに
ある。 A second object of the present invention is to provide an electrostatic latent image developing method capable of forming a thin layer of sufficiently charged non-magnetic toner on the surface of a developer donor member.
この発明の第三の目的は、現像剤層厚規制用磁
気ブラシからの磁性体粒子の脱離を防止すること
のできる静電潜像現像方法を提供することにあ
る。 A third object of the present invention is to provide an electrostatic latent image developing method that can prevent magnetic particles from detaching from a magnetic brush for regulating developer layer thickness.
本発明に係る静電潜像現像方法は、表面に現像
剤容器から補給されたトナーのみからなる非磁性
一成分現像剤を担持して移動するエンドレスな現
像剤供与部材より潜像保持体上に保持された静電
潜像にトナーを供給して静電潜像の現像を行う静
電潜像現像方法において、現像剤供与部材の表面
に担持されるトナーの層厚を、現像剤供与部材と
前記現像剤供与部材に近接して設けらえたドクタ
ーブレードとの間の空間に磁力によつて保持さ
れ、かつ粒径が前記トナーの平均粒径の0.1倍か
ら３倍の範囲内である複数の磁性体粒子から成る
磁気ブラシによつて規制するものであり、このこ
とにより上記の目的が達成される。
In the electrostatic latent image developing method according to the present invention, a non-magnetic one-component developer made of only toner supplied from a developer container is transferred onto a latent image carrier from an endless developer supplying member that moves. In an electrostatic latent image developing method in which the electrostatic latent image is developed by supplying toner to the retained electrostatic latent image, the layer thickness of the toner carried on the surface of the developer donor member is adjusted to A plurality of particles are held by magnetic force in a space between the developer supplying member and a doctor blade provided in close proximity to the developer supply member, and have a particle size within a range of 0.1 to 3 times the average particle size of the toner. This is controlled by a magnetic brush made of magnetic particles, thereby achieving the above object.
本発明の効果は以下の通りである。現像剤供与
部材を移動させるとトナーと現像剤供与部材表面
との摩擦帯電による静電吸引力、トナー同志の自
己付着力等の力によつて形成されたある厚さのト
ナー層が磁性体粒子から成る磁気ブラシに向かつ
て搬送され、やがてこれに衝突する。磁性体粒子
の粒径をトナーの平均粒径の３倍以下とすると、
磁性体粒子同志の間の間隙のサイズが小さくなる
ためこの間隙を多量のトナーが通過することは許
されず従つて磁気ブラシの下を通過した後の現像
剤供与部材表面には均一性の良好なトナーの薄層
が形成される。また現像剤供与部材との摩擦帯電
によつて充分に帯電したトナーは静電気力によつ
て現像剤供与部材表面に引きつけられているため
に磁気ブラシの下を通過することができるが、充
分に帯電していないトナーは通過を阻止される。
このようにして現像剤供与部材表面には充分に帯
電した非磁性トナーのみから成る均一な薄層が形
成される。
The effects of the present invention are as follows. When the developer donor member is moved, a toner layer of a certain thickness is formed by forces such as electrostatic attraction due to frictional charging between the toner and the surface of the developer donor member, and the self-adhesion force of the toner particles. It is transported toward a magnetic brush consisting of a magnetic brush, and eventually collides with it. When the particle size of the magnetic particles is 3 times or less the average particle size of the toner,
Since the size of the gap between the magnetic particles becomes small, a large amount of toner is not allowed to pass through this gap, so the surface of the developer donor member after passing under the magnetic brush has good uniformity. A thin layer of toner is formed. In addition, toner that has been sufficiently charged by frictional charging with the developer donor member can pass under the magnetic brush because it is attracted to the surface of the developer donor member by electrostatic force. Toner that has not been used is blocked from passing.
In this way, a uniform thin layer consisting only of sufficiently charged non-magnetic toner is formed on the surface of the developer donor member.
一方、磁性体粒子も現像剤供与部材またはトナ
ーとの摩擦帯電によつて電荷を獲得し、現像剤供
与部材へ向かう静電気力を受けるが、粒径が極端
に小さいときは、この静電気力が磁力に打ち勝つ
場合が生じ、磁性体粒子が磁気ブラシから脱離し
てゆく。磁性体粒子の粒径をトナーの平均粒径の
１／１０以上とするとこの現象を防止することができ
る。 On the other hand, magnetic particles also acquire electric charges due to frictional electrification with the developer donor member or toner, and are subjected to electrostatic force directed toward the developer donor member. However, when the particle size is extremely small, this electrostatic force is replaced by the magnetic force. In some cases, the magnetic particles overcome the magnetic brush and become detached from the magnetic brush. This phenomenon can be prevented by setting the particle size of the magnetic particles to 1/10 or more of the average particle size of the toner.
このように、本発明の特徴は、トナー層厚規制
用磁気ブラシを構成する磁性体粒子の粒径をトナ
ーの平均粒径の1/10以上３倍以下とすることにあ
る。 As described above, the feature of the present invention is that the particle size of the magnetic particles constituting the magnetic brush for regulating the toner layer thickness is set to 1/10 or more and 3 times or less of the average particle size of the toner.
以下、本発明の実施例について図面を参照しな
がら詳細に説明する。第１図はこの発明の一実施
例を示す概略図である。現像剤供与部材である現
象ローラ１はアルミニウム等の金属より成る導電
性の中空洞筒であり、図中の矢印の向きに回転可
能に支持されている。ドクターブレード２はマグ
ネツトより成つており、現像ローラ１の表面に対
し一定の間隙をもつて固定されている。本実施例
ではこの間隙を２mmとした。現像剤層厚規制用磁
気ブラシ３は平均粒径が10μｍの磁性体粉末によ
つて構成されており、現像ローラ１の内側の空間
に固定されている磁性体４とドクターブレード２
の間に形成されている磁界によつて現像ローラ１
の表面とドクターブレード２の先端の間の空間に
保持されている。側壁５とドクターブレード２及
び磁気ブラシ３によつて構成されている現像剤容
器８の中には、平均粒径が10μｍの非磁性トナー
６が収納されている。本実施例における非磁性ト
ナー６は、エポキシ系、スチレン系、フエノール
系その他の樹脂を主成分とし、カーボン等の染
料、電荷制御剤および添加剤、例えば流動性を良
くするためのステアリン酸亜鉛、二硫化モリブデ
ン等を含む。トナーの体積抵抗は10°Ω・cm以上、
好ましくは1014Ω・cm以上のものが適している。
また第１図中７は、静電潜像が保持される潜像保
持体である。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of the present invention. The developing roller 1, which is a developer supplying member, is a conductive hollow cylinder made of metal such as aluminum, and is supported so as to be rotatable in the direction of the arrow in the figure. The doctor blade 2 is made of a magnet and is fixed to the surface of the developing roller 1 with a certain gap therebetween. In this example, this gap was set to 2 mm. The magnetic brush 3 for regulating the developer layer thickness is made of magnetic powder with an average particle size of 10 μm, and includes a magnetic material 4 and a doctor blade 2 fixed in the space inside the developing roller 1.
The developing roller 1 is
is held in the space between the surface of the doctor blade 2 and the tip of the doctor blade 2. A developer container 8 constituted by a side wall 5, a doctor blade 2, and a magnetic brush 3 contains non-magnetic toner 6 having an average particle size of 10 μm. The non-magnetic toner 6 in this embodiment is mainly composed of epoxy, styrene, phenol, or other resins, and contains dyes such as carbon, charge control agents, and additives, such as zinc stearate to improve fluidity. Contains molybdenum disulfide, etc. The volume resistance of the toner is 10°Ω・cm or more,
Preferably, one with a resistance of 10 14 Ω·cm or more is suitable.
Further, numeral 7 in FIG. 1 is a latent image holder on which an electrostatic latent image is held.
現像剤容器８の中のトナー６は、現像ローラ表
面との摩擦帯電による静電気力、トナー同志の凝
集力等によつて現像ローラ表面に付着し、現像ロ
ーラ１の時計回り方向の回転によつて搬送され、
磁気ブラシ３およびドクターブレード２に接近す
る。磁気ブラシ３とその周辺の拡大図である第２
図を参照しながら以下にトナー層形成の過程を説
明する。磁性体粒子１０は磁性体４とドクターブ
レード２の間に存在する磁力線１１に沿つてつら
なり磁気ブラシ３を形成している。上述のように
して磁気ブラシ３に接近したトナー６はやがてこ
れに衝突し現象ローラ１の移動の向きと逆の方向
の反発力を受ける。帯電量の小さいトナー、すな
わち現像ローラ１との静電気力の弱いトナーはこ
の反発力に打ち勝つことができずドクターブレー
ド２と現象ローラ１の間の間陳を通過することが
できない。一方現像ローラ１の表面との摩擦帯電
によつて充分に帯電しているトナー１２は磁気ブ
ラシ３による反発力に打ち勝ち磁気ブラシの下を
通過することが可能となる。通過の際にトナー６
は磁気ブラシ３と現象ローラ１の間で摩擦を受け
るためさらに大きな静電気を獲得することができ
る。磁気ブラシ３は、トナーによる圧力等の外力
を受けた場合に変形可能であるためトナー層形成
やトナーの帯電の過程で剛体ブレードを規制部材
として使用した場合にはみられないすぐれた効果
を発揮する。 The toner 6 in the developer container 8 adheres to the developing roller surface due to electrostatic force due to frictional charging with the developing roller surface, cohesive force of the toner, etc., and is attached to the developing roller surface by the clockwise rotation of the developing roller 1. transported,
The magnetic brush 3 and doctor blade 2 are approached. The second image is an enlarged view of the magnetic brush 3 and its surroundings.
The process of forming a toner layer will be described below with reference to the drawings. The magnetic particles 10 are strung together along magnetic lines of force 11 existing between the magnetic body 4 and the doctor blade 2 to form a magnetic brush 3 . The toner 6 approaching the magnetic brush 3 as described above eventually collides with it and receives a repulsive force in the opposite direction to the direction of movement of the phenomenon roller 1. Toner having a small amount of charge, that is, toner having a weak electrostatic force with the developing roller 1, cannot overcome this repulsive force and cannot pass through the gap between the doctor blade 2 and the developing roller 1. On the other hand, the toner 12, which is sufficiently charged by frictional charging with the surface of the developing roller 1, can overcome the repulsive force of the magnetic brush 3 and pass under the magnetic brush. Toner 6 when passing
is subjected to friction between the magnetic brush 3 and the phenomenon roller 1, so that even larger static electricity can be acquired. Since the magnetic brush 3 can be deformed when subjected to external force such as pressure from toner, it exhibits excellent effects that cannot be seen when a rigid blade is used as a regulating member in the process of toner layer formation and toner charging. do.
磁性体粒子の粒径をトナーの平均粒径の３倍以
下とすると第３図に示すようにトナーは磁性体粒
子１０と現像ローラ１によつて形成される間隙１
１を磁性体粒子１０に接触せずに通過することは
あり得ず、従つてこの間隙１１を同時に多量のト
ナーが通過することはない。このような理由から
現像ローラの表面に形成されるトナー層の厚さは
磁性体粒子１０の粒径が小さい程均一になること
が予想されるが、磁性体粒子の粒径とトナーの平
均粒径をともに10μｍとした本実施例では予想通
りの均一なトナー層を得ることができた。第４図
は、磁性体粒子の粒径を変えた場合のトナー層の
均一性の変化を曲線ａで表わす実験結果である。
同図より均一なトナー層を得るためには磁性体粒
子の粒径をトナーの平均粒径の３倍以下としなけ
ればならないことがわかる。（なおトナーの平均
粒径は約10μｍである。）
また実験結果によれば磁性体粒子の粒径が極端
に小さい場合は、磁性体粒子が磁気ブラシから脱
離し現像ローラ表面に付着して搬送されることが
わかつている。第５図は現像ローラ表面の1Cm2
あたりに付着する磁性体粒子の個数を磁性体粒子
の粒径をパラメータとして曲線ｂで表わした実験
結果である。同図より磁性体粒子の粒径はトナー
の平均粒径の1/10以上でなければならない。（な
おトナーの平均粒径は約10μｍである。）
以上のように本発明の静電潜像現像方法によれ
ば現像剤供与部材の表面に充分に帯電した非磁性
トナーの均一な薄層を形成することができ、従つ
て静電潜像の良好な現像を行なうことができる。
なお、磁気ブラシからの磁性体粒子の脱離を防止
することも可能となる。 When the particle size of the magnetic particles is set to three times or less than the average particle size of the toner, the toner is distributed in the gap 1 formed by the magnetic particles 10 and the developing roller 1, as shown in FIG.
1 without coming into contact with the magnetic particles 10, and therefore a large amount of toner cannot pass through this gap 11 at the same time. For this reason, it is expected that the thickness of the toner layer formed on the surface of the developing roller will become more uniform as the particle size of the magnetic particles 10 becomes smaller. In this example, where both diameters were 10 μm, a uniform toner layer as expected could be obtained. FIG. 4 shows experimental results in which the change in the uniformity of the toner layer when the particle size of the magnetic particles is changed is represented by a curve a.
It can be seen from the figure that in order to obtain a uniform toner layer, the particle size of the magnetic particles must be three times or less the average particle size of the toner. (The average particle size of toner is approximately 10 μm.) Also, according to experimental results, when the particle size of the magnetic particles is extremely small, the magnetic particles detach from the magnetic brush, adhere to the surface of the developing roller, and are transported. I know it will happen. Figure 5 shows 1cm 2 of the surface of the developing roller.
This is an experimental result in which the number of magnetic particles adhering to the area is expressed by curve b using the particle diameter of the magnetic particles as a parameter. From the figure, the particle size of the magnetic particles must be 1/10 or more of the average particle size of the toner. (The average particle size of the toner is approximately 10 μm.) As described above, according to the electrostatic latent image developing method of the present invention, a uniform thin layer of sufficiently charged non-magnetic toner is formed on the surface of the developer donor member. Therefore, the electrostatic latent image can be developed satisfactorily.
Note that it is also possible to prevent the magnetic particles from detaching from the magnetic brush.
第１図は本発明の一実施例を示す断面図、第２
図はこの実施例における磁気ブラシとその周辺を
示す拡大断面図、第３図は本発明におけるトナー
及び磁性体粒子を球型とした場合の大小関係を表
わす正面図、第４図は本発明における磁性体粒子
の粒径を変えた場合のトナー層の均一性の変化を
表わす実験結果説明図、第５図は本発明における
磁気ブラシからの磁性体粒子の脱離と粒径との関
係を示す実験結果説明図である。
１：現像剤供与部材（現像ローラ）、２：ドク
ターブレード（マグネツト）、３：磁性体粒子層
（磁気ブラシ）、４：磁性体、６：非磁性一成分現
像剤、１０：磁性体粒子、１１：磁力線。
FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is an enlarged sectional view showing the magnetic brush and its surroundings in this embodiment, FIG. 3 is a front view showing the size relationship when the toner and magnetic particles in the present invention are spherical, and FIG. An explanatory diagram of experimental results showing changes in the uniformity of the toner layer when the particle size of the magnetic particles is changed. FIG. 5 shows the relationship between the detachment of the magnetic particles from the magnetic brush and the particle size in the present invention. It is an explanatory diagram of experimental results. 1: Developer donor member (developing roller), 2: Doctor blade (magnet), 3: Magnetic particle layer (magnetic brush), 4: Magnetic material, 6: Non-magnetic one-component developer, 10: Magnetic particles, 11: Lines of magnetic force.
Claims (1)
からなる非磁性一成分現像剤を担持して移動する
エンドレスな現像剤供与部材より潜像保持体上に
保持された静電潜像にトナーを供給して静電潜像
の現像を行う静電潜像現像方法において、現像剤
供与部材の表面に担持されるトナーの層厚を、現
像剤供与部材と前記現像剤供与部材に近接して設
けられたドクターブレードとの間の空間に磁力に
よつて保持され、かつ粒径が前記トナーの平均粒
径の0.1倍から３倍の範囲内である複数の磁性体
粒子から成る磁気ブラシによつて規制することを
特徴とする静電潜像現像方法。1. Toner is supplied to the electrostatic latent image held on the latent image holding member from an endless developer supplying member that moves while carrying a non-magnetic one-component developer consisting only of toner supplied from a developer container on its surface. In an electrostatic latent image developing method in which an electrostatic latent image is developed using regulated by a magnetic brush consisting of a plurality of magnetic particles held by magnetic force in the space between the toner and the doctor blade and having a particle size within a range of 0.1 to 3 times the average particle size of the toner. An electrostatic latent image developing method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57111763A JPS593458A (en) | 1982-06-30 | 1982-06-30 | Developing device of electrostatic latent image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57111763A JPS593458A (en) | 1982-06-30 | 1982-06-30 | Developing device of electrostatic latent image |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS593458A JPS593458A (en) | 1984-01-10 |
| JPH045985B2 true JPH045985B2 (en) | 1992-02-04 |
Family
ID=14569564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57111763A Granted JPS593458A (en) | 1982-06-30 | 1982-06-30 | Developing device of electrostatic latent image |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS593458A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61124972A (en) * | 1984-11-22 | 1986-06-12 | Konishiroku Photo Ind Co Ltd | Toner supplementing device |
| JPH0736093B2 (en) * | 1985-03-26 | 1995-04-19 | 株式会社日立製作所 | Developing device for electrostatic recording |
| JPS61270777A (en) * | 1985-05-27 | 1986-12-01 | Hitachi Ltd | Electrophotographic device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5782853A (en) * | 1980-11-11 | 1982-05-24 | Canon Inc | Developing method |
-
1982
- 1982-06-30 JP JP57111763A patent/JPS593458A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5782853A (en) * | 1980-11-11 | 1982-05-24 | Canon Inc | Developing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS593458A (en) | 1984-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4337724A (en) | Developing device | |
| JPS5811621B2 (en) | Copying method | |
| JPS5813907B2 (en) | dry developer | |
| US3064622A (en) | Immersion development | |
| JPH045985B2 (en) | ||
| JPH01191165A (en) | Developing device | |
| JPH0458627B2 (en) | ||
| JPH03231771A (en) | Developing device | |
| JPS6355709B2 (en) | ||
| JPH02109072A (en) | Developing device and developing sleeve | |
| JPS6161107B2 (en) | ||
| JPS61275864A (en) | Developer for electrophotography | |
| JPS6053973A (en) | Non-magnetic one-component developing device | |
| JPS5921028B2 (en) | Electrostatic latent image development method | |
| JPH048432Y2 (en) | ||
| JPS60140277A (en) | Developing method by electrophotographic method | |
| JPS6128969A (en) | Nonmagnetic one-component developing device | |
| JPH0519708B2 (en) | ||
| JPS60229056A (en) | Nonmagnetic single-component developing device | |
| JPH04165350A (en) | Developing device | |
| JPS63264781A (en) | Dry developing device | |
| JPH0442177A (en) | Developer carrier | |
| JPH04268586A (en) | Developing device | |
| JPH04284462A (en) | Image forming method | |
| JPH04293065A (en) | Image forming method |