JPH047509B2 - - Google Patents
Info
- Publication number
- JPH047509B2 JPH047509B2 JP23893783A JP23893783A JPH047509B2 JP H047509 B2 JPH047509 B2 JP H047509B2 JP 23893783 A JP23893783 A JP 23893783A JP 23893783 A JP23893783 A JP 23893783A JP H047509 B2 JPH047509 B2 JP H047509B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- layer
- magnetic
- developing device
- carrier
- 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
- 239000002245 particle Substances 0.000 claims description 55
- 230000005684 electric field Effects 0.000 claims description 15
- 239000006249 magnetic particle Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 2
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000004907 flux Effects 0.000 description 4
- 238000001454 recorded image Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000009191 jumping Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 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
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
- G03G15/0928—Details concerning the magnetic brush roller structure, e.g. magnet configuration relating to the shell, e.g. structure, composition
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電子写真法、静電記録法、静電印刷
法あるいは磁気記録法等によつて像形成体面に形
成した静電潜像あるいは磁気潜像にトナー粒子を
付着させる記録装置の現像装置に関し、特に、磁
石体を内包したスリーブ状現像剤搬送担体面に磁
性キヤリヤ粒子とトナー粒子の混合から成る二成
分現像剤の層を形成して、振動電界下で現像剤層
から像形成体の潜像にトナー粒子を付着させる現
像装置の改良に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an electrostatic latent image or Regarding a developing device of a recording device that attaches toner particles to a magnetic latent image, in particular, a layer of a two-component developer consisting of a mixture of magnetic carrier particles and toner particles is formed on the surface of a sleeve-shaped developer transport carrier containing a magnet. The present invention relates to an improvement in a developing device that causes toner particles to adhere to a latent image on an image forming member from a developer layer under an oscillating electric field.
上述のような現像装置は、特開昭56ー144452
号、同57−139761号、同57−147652号、同58−
48065号各公報によつて知られている。これらの
公報に記載された現像装置は、二成分現像剤を用
いたことによつて、磁性トナー粒子の一成分現像
剤を用いたものよりも、トナー粒子の摩擦帯電制
御が容易になり、凝集が起りにくくなつて、現像
剤搬送担体面に均一に現像剤層を形成することも
容易になり、さらに、振動電界によつて現像剤層
から像形成体へのトナー粒子の移行制御が容易に
行われるようになるから、現像剤層を像形成体面
に接触させずに振動電界下で現像剤層から像形成
体にトナー粒子を移行させるようにして、現像剤
層を像形成体に接触させるものにおいて生じ易い
掃き目やかぶりのない現像が行われるようにする
ものである。しかし、このような現像装置におい
て、現像が安定して再現性のよい高画質画像を与
えるように行われるためには、現像剤層を像形成
体面に接触させるものよりも、現像剤層の層厚を
薄く均一に形成することが重要である。現像剤層
の層厚が厚過ぎたり、不均一であつたりすると、
振動電界によるトナー粒子の移行制御が安定して
行われ難くなり、かぶりやエツジ効果が現われ易
くなつて、折角非接触ジヤンピング現像を行うよ
うにしていてもその効果が得られなくなる。しか
るに、従来の上述のような現像装置は、現像剤層
を像形成体面に接触させる現像装置と同様、現像
剤搬送担体にアルミニウムやステンレス鋼のよう
な非磁性体から成るものを用いているために、現
像剤搬送担体の表面に形成される現像剤層に、現
像剤搬送担体の内部に設けられる磁石体の磁極配
置に起因する、層厚の不同が生じ易く、現像剤層
を層厚薄く均一に形成することが難しいと云う問
題があつた。
The above-mentioned developing device is disclosed in Japanese Patent Application Laid-Open No. 56-144452.
No. 57-139761, No. 57-147652, No. 58-
It is known from the publications No. 48065. By using a two-component developer, the developing devices described in these publications can more easily control triboelectrification of magnetic toner particles than those using a single-component developer, and prevent agglomeration. This makes it easier to form a developer layer uniformly on the surface of the developer transport carrier, and furthermore, it becomes easier to control the transfer of toner particles from the developer layer to the image forming body using the oscillating electric field. The developer layer is brought into contact with the image forming body in such a way that toner particles are transferred from the developer layer to the image forming body under an oscillating electric field without bringing the developer layer into contact with the surface of the image forming body. This allows development to be carried out without any scratches or fogging, which tend to occur in other products. However, in such a developing device, in order for development to be carried out stably and to give a high-quality image with good reproducibility, the layer of the developer layer should not be brought into contact with the surface of the image forming member. It is important to form a thin and uniform thickness. If the developer layer is too thick or uneven,
It becomes difficult to stably control the transfer of toner particles using an oscillating electric field, and fog and edge effects are more likely to appear, making it impossible to obtain the effects of non-contact jumping development, even if efforts are made to do so. However, in the conventional developing device as described above, similar to the developing device that brings the developer layer into contact with the surface of the image forming body, the developer transport carrier is made of a non-magnetic material such as aluminum or stainless steel. In addition, variations in layer thickness tend to occur in the developer layer formed on the surface of the developer transport carrier due to the magnetic pole arrangement of the magnet provided inside the developer transport carrier. There was a problem that it was difficult to form uniformly.
一方、現像剤搬送担体が回転して内部の磁石体
が静止しており、現像剤搬送担体の表面に形成さ
れた現像剤層を像形成体面に接触させる現像装置
において、現像剤搬送担体に不均一な磁性層を設
けて、それにより磁石体が形成する磁界に変動を
生じさせて、高濃度で高コントラストの現像が行
われるようにしたものが特開昭58−115450号公報
により知られている。 On the other hand, in a developing device in which the developer transport carrier rotates and the internal magnet remains stationary, and the developer layer formed on the surface of the developer transport carrier is brought into contact with the surface of the image forming member, the developer transport carrier is JP-A-58-115450 discloses a method in which a uniform magnetic layer is provided to cause fluctuations in the magnetic field formed by the magnet body, thereby achieving high-concentration and high-contrast development. There is.
本発明は、二成分現像剤を用いて振動電界下で
現像を行う現像装置の現像剤搬送担体に現像剤層
が薄く均一に形成できて、安定してかぶりやエツ
ジ効果のない現像を行うことができ、特に、非接
触ジヤンピング現像条件によれば掃き目もない高
画質画像の現像を行うことができる現像装置の提
供を目的としてなされたものであり、磁性層を設
けて磁石体が形成する磁界に変動を生じさせると
云う特開昭58−115450号公報記載の技術を応用す
れば、現像剤搬送担体に薄く均一に現像剤層を形
成することができるとことを見出して本発明に到
達したものである。
The present invention is capable of forming a thin and uniform developer layer on a developer transport carrier of a developing device that performs development under an oscillating electric field using a two-component developer, thereby stably performing development without fogging or edge effects. The purpose of this development is to provide a developing device that can develop a high-quality image with no streaks under non-contact jumping developing conditions, and in which a magnetic layer is provided to form a magnetic body. The present invention was achieved by discovering that a thin and uniform developer layer can be formed on a developer transport carrier by applying the technique described in Japanese Patent Application Laid-Open No. 115450/1983 that causes fluctuations in the magnetic field. This is what I did.
本発明は、磁石体を内包したスリーブ状現像剤
搬送担体面に磁性キヤリヤ粒子とトナー粒子の混
合から成る二成分現像剤の層を形成して、振動電
界下で現像剤層から像形成体の潜像にトナー粒子
を付着させる現像装置において、前記現像剤搬送
担体が表面に沿つた磁性層を有することを特徴と
する現像装置にある。
In the present invention, a two-component developer layer consisting of a mixture of magnetic carrier particles and toner particles is formed on the surface of a sleeve-shaped developer transport carrier containing a magnet, and an image forming member is transferred from the developer layer under an oscillating electric field. The developing device for attaching toner particles to a latent image is characterized in that the developer transporting carrier has a magnetic layer along the surface thereof.
以下、本発明を図面を参照して詳細に説明す
る。 Hereinafter, the present invention will be explained in detail with reference to the drawings.
第１図は本発明現像装置の一例を示す記録装置
の部分断面図、第２図及び第３図はそれぞれ現像
剤搬送担体の構成の一例を示す斜視図である。 FIG. 1 is a partial sectional view of a recording device showing an example of the developing device of the present invention, and FIGS. 2 and 3 are perspective views showing an example of the structure of a developer transport carrier, respectively.
図において、１は、表面にSe等の感光体や誘
電体から成る像形成層を有し、図示していない帯
電、露光装置等によつて像形成層に静電潜像を形
成されるドラム状の矢印方向に回転する像形成
体、２は、ステンレス鋼やＡ等の非磁性体から
成るスリーブ２ａ上に磁性層２ｂを設けた構成の
現像剤搬送担体であり、これには、磁性層２ｂ
が、第２図に示したような、例えば50μmの厚さ
のNiめつき層から成るもの、第３図に示したよ
うな、Ni等の磁性金属材料を50〜2000μm程度の
厚さとなるように金属溶射法で吹き付けた層から
成るもの、あるいは、Niやフエライト等の磁性
体粒子を分散した樹脂の塗布層から成るもの等が
用いられる。なお、現像剤搬送担体２の表面は、
滑かな面であつてもよいし、適当な凹凸を有する
粗面であつてもよい。粗面の方が表面に形成され
る現像剤層の搬送性が高くなる。また、第２図や
第３図に示したような現像剤搬送担体２では、磁
性層２ｂ上にさらに樹脂被膜を設けるようにする
と、表面が絶縁性となつて現像剤搬送担体２に高
いバイアス電圧を印加することが容易になる。そ
の点、磁性層２ｂが磁性体粒子の分散含有樹脂層
から成るものでは、特に表面に樹脂被膜を設ける
ことをしなくても、比較的高いバイアス電圧を印
加し得る。３は、保護抵抗４を介して現像剤搬送
担体２にバイアス電源、５は、現像剤搬送担体２
のスリーブ２ａの内部に設けられた磁石体であ
り、磁石体５は表面に複数のＮ，Ｓ磁極を周方向
に配置した形で有し、Ｎ，Ｓ磁極は通常500〜
1500ガウスの磁束密度に磁化されている。 In the figure, 1 is a drum that has an image forming layer made of a photoreceptor or dielectric such as Se on its surface, and an electrostatic latent image is formed on the image forming layer by a charging/exposure device (not shown). The image forming body 2 rotating in the direction of the arrow is a developer transporting carrier having a magnetic layer 2b on a sleeve 2a made of a non-magnetic material such as stainless steel or A. 2b
However, as shown in Fig. 2, for example, a layer made of Ni plating with a thickness of 50 μm, and as shown in Fig. 3, a magnetic metal material such as Ni is plated to a thickness of about 50 to 2000 μm. A layer made of a layer sprayed using a metal spraying method, or a coated layer of a resin in which magnetic particles such as Ni or ferrite are dispersed are used. Note that the surface of the developer transport carrier 2 is
It may be a smooth surface or a rough surface with appropriate unevenness. The rougher the surface, the higher the transportability of the developer layer formed on the surface. Furthermore, in the developer transport carrier 2 shown in FIGS. 2 and 3, if a resin film is further provided on the magnetic layer 2b, the surface becomes insulating and the developer transport carrier 2 is subjected to a high bias voltage. It becomes easy to apply voltage. In this respect, if the magnetic layer 2b is made of a resin layer containing dispersed magnetic particles, a relatively high bias voltage can be applied even without providing a resin coating on the surface. 3 is a bias power supply to the developer transport carrier 2 via a protective resistor 4; 5 is a bias power supply to the developer transport carrier 2;
The magnet body 5 has a plurality of N and S magnetic poles arranged in the circumferential direction on its surface, and the N and S magnetic poles are usually 500 to 500.
It is magnetized to a magnetic flux density of 1500 Gauss.
図示の現像装置は、磁石体５が矢印方向に回転
し、それによつて現像剤溜り６において現像剤搬
送担体２の表面に現像剤Ｄが磁性キヤリヤ粒子に
トナー粒子を伴つた形で吸着されて磁石体５の回
転と反対の矢印方向に移動するようになることで
現像剤層の形成が行われるものであるが、現像剤
搬送担体２は静止しているものでも、現像剤層の
移動方向と同方向に回転するものでも、逆方向に
回転するものでもよいし、また、磁石体５が静止
して、現像剤層が現像剤搬送担体２の回転と共に
移動するものでもよい。磁石体５が静止している
ものでは、磁石体５の像形成体１に対向する表面
部分に位置する磁極の磁束密度を他の磁極の磁束
密度よりも大きくするのが好ましい。それは、磁
化を強くする方法によるものでも、磁極を接近さ
せて設ける方法によるものでもよい。 In the illustrated developing device, the magnet body 5 rotates in the direction of the arrow, whereby the developer D is attracted to the surface of the developer transport carrier 2 in the developer reservoir 6 in the form of magnetic carrier particles and toner particles. The developer layer is formed by moving in the direction of the arrow opposite to the rotation of the magnet 5, but even if the developer transport carrier 2 is stationary, the direction of movement of the developer layer is It may rotate in the same direction or in the opposite direction, or it may be such that the magnet body 5 is stationary and the developer layer moves with the rotation of the developer transport carrier 2. When the magnet body 5 is stationary, it is preferable that the magnetic flux density of the magnetic pole located on the surface portion of the magnet body 5 facing the image forming body 1 is larger than the magnetic flux density of the other magnetic poles. This may be done by increasing magnetization or by placing magnetic poles close to each other.
本発明現像装置は、以上のいずれの方法によつ
て現像剤層を形成するものであつても、。現像剤
搬送担体２に前述のような磁性層２ｂが設けられ
ているから、それによつて現像剤搬送担体２の表
面に現れる磁力は適当に均一化され、したがつ
て、現像剤層が付着の最初から比較的均一な厚さ
で形成されて、磁性あるいは非磁性の層厚規制プ
レード７により効果的に均一な所定の厚さに規制
される。 The developing device of the present invention may form a developer layer by any of the above methods. Since the magnetic layer 2b as described above is provided on the developer transport carrier 2, the magnetic force appearing on the surface of the developer transport carrier 2 is appropriately uniformized, and therefore the developer layer is not attached. It is formed to have a relatively uniform thickness from the beginning, and is effectively regulated to a uniform predetermined thickness by a magnetic or non-magnetic layer thickness regulating plate 7.
８は、現像域Ａを通過した現像剤層を現像剤搬
送担体２の表面から除去して現像剤溜り６に戻す
クリーニングブレード、９は現像剤溜り６の現像
剤Ｄを攪拌して、トナー粒子とキヤリヤ粒子の混
合を均一化すると共に、トナー粒子を摩擦帯電さ
せる攪拌ローラ、１０は、トナーホツパー１１か
らトナー粒子を現像剤溜り６に補給するトナー補
給ローラである。 8 is a cleaning blade that removes the developer layer that has passed through the development area A from the surface of the developer transport carrier 2 and returns it to the developer reservoir 6; 9 is a cleaning blade that stirs the developer D in the developer reservoir 6 to form toner particles; A stirring roller 10 serves to homogenize the mixing of toner particles and carrier particles, and to frictionally charge the toner particles. Reference numeral 10 denotes a toner supply roller that supplies toner particles from a toner hopper 11 to a developer reservoir 6.
このような本発明の現像装置は、現像剤搬送担
体２と像形成体１の間隙を現像剤搬送担体２の表
面に形成された現像剤層が像形成体１の表面に接
触しない範囲の狭い間隙に設定するのが好まし
い。それによつて、掃き目の生じない現像が行わ
れる。そして、この間隙は、数10〜2000μmにす
るのが好ましい。この間隙が狭くなり過ぎると、
それに合わせて現像剤層を薄く形成せねばなら
ず、それでは現像剤層を均一に形成しても現像剤
層におけるトナー粒子の均一性が得られなくなつ
たり、トナー粒子を十分に現像域に供給すること
ができなくなつたりして、安定して鮮明な現像を
行うことが難しくなる。また、間隙が2000μmを
大きく超すようになると、振動電界によるトナー
粒子の移行制御が困難となり、十分な現像濃度が
得られなくなる。しかるに、間隙を数10〜
2000μmの範囲にした場合には、それに対して現
像剤層を、像形成体１の表面に接触しないで振動
電界によつて効果的にトナー粒子の移行制御が行
われる、適当な均一の厚さに形成することがで
き、それによつてかぶりやエツジ効果のない、勿
論、画像に掃き目の生ずることもない鮮明な現像
を行うことができる。 In the developing device of the present invention, the gap between the developer transport carrier 2 and the image forming body 1 is narrow enough that the developer layer formed on the surface of the developer transport carrier 2 does not come into contact with the surface of the image forming body 1. It is preferable to set it at a gap. As a result, development is performed without any scratches. This gap is preferably several tens to 2000 μm. If this gap becomes too narrow,
Accordingly, the developer layer must be formed thinly, and even if the developer layer is formed uniformly, it may not be possible to obtain uniformity of toner particles in the developer layer, or the toner particles may not be sufficiently supplied to the developing area. As a result, it becomes difficult to perform stable and clear development. Furthermore, if the gap greatly exceeds 2000 μm, it becomes difficult to control the transfer of toner particles using an oscillating electric field, making it impossible to obtain a sufficient developed density. However, the gap is several 10~
In contrast, when the thickness is in the range of 2000 μm, the developer layer must have an appropriate uniform thickness so that the transfer of toner particles can be effectively controlled by the oscillating electric field without contacting the surface of the image forming member 1. As a result, it is possible to perform clear development without fogging or edge effects, and of course, without creating any scratches in the image.
このトナー粒子の移行制御のために、現像剤搬
送担体２と像形成体１の間に生ぜしめる振動電界
は、バイアス電源３によつて現像剤搬送担体２に
交流成分の実効値が200〜5000V、周波数が100Hz
〜10kHz、好ましくは300〜4000V、１〜5kHzの
バイアス電圧を印加し、それによつて実効値で
300〜5000V／mmの電界強さを示すようなもので
あることが望ましい。バイアス電源３によつて現
像剤搬送担体２に印加するバイアス電圧には、か
ぶりの発生を防止するために、像形成体１の非画
像部電位と同極性の適当な大きさの直流電圧が重
畳して用いられることは勿論である。また、図示
例に限らず、像形成体１と現像剤搬送担体２の間
にトナー粒子の移行を妨げないワイヤ電極をネツ
ト電極等を設けて、それにバイアス電圧を印加す
ることによつて現像域Ａに振動電界を生ぜしめる
ようにしてもよい。その場合も、バイアス電圧に
直流成分を重畳したり、現像剤搬送担体２に直流
電圧を印加したり、さらに現像剤搬送担体２に異
つた振動数の振動電圧を印加したりすることも行
われる。バイアス電圧の交流成分の波形は、正弦
波に限らず、三角波や矩形波等であつてもよい。
また、バイアス電圧の直流成分の電圧や極性等を
適当に設定することによつて、本発明現像装置
は、ポジ現像だけでなく反転現像にも適用し得
る。反転現像の場合は、バイアス電圧の直流成分
は像形成体の非画像背景部における受容電位と略
等しい電圧に設定される。さらに本発明現像装置
は、トナー粒子に磁性体を含有したものを用いる
ことで磁気潜像の現像にも適用し得る。 In order to control the transfer of toner particles, the oscillating electric field generated between the developer transport carrier 2 and the image forming body 1 is applied to the developer transport carrier 2 by a bias power supply 3 with an effective value of AC component of 200 to 5000 V. , the frequency is 100Hz
Apply a bias voltage of ~10kHz, preferably 300-4000V, 1-5kHz, thereby
It is desirable that it exhibits an electric field strength of 300 to 5000 V/mm. The bias voltage applied to the developer transport carrier 2 by the bias power supply 3 is superimposed with a DC voltage of an appropriate magnitude having the same polarity as the potential of the non-image area of the image forming member 1 in order to prevent fogging. Of course, it can be used as In addition, not limited to the illustrated example, a wire electrode such as a net electrode that does not hinder the transfer of toner particles is provided between the image forming body 1 and the developer transporting carrier 2, and a bias voltage is applied to the wire electrode to form a developing area. An oscillating electric field may be generated at A. In that case, a DC component is superimposed on the bias voltage, a DC voltage is applied to the developer transport carrier 2, and an oscillating voltage of a different frequency is applied to the developer transport carrier 2. . The waveform of the alternating current component of the bias voltage is not limited to a sine wave, but may be a triangular wave, a rectangular wave, or the like.
Further, by appropriately setting the voltage and polarity of the DC component of the bias voltage, the developing device of the present invention can be applied not only to positive development but also to reversal development. In the case of reversal development, the DC component of the bias voltage is set to a voltage approximately equal to the accepted potential in the non-image background portion of the image forming member. Furthermore, the developing device of the present invention can also be applied to developing magnetic latent images by using toner particles containing a magnetic substance.
本発明現像装置には、従来の二成分現像剤と同
様の、平均粒径が十数μm〜数百μmの磁性キヤリ
ヤ粒子と平均粒径が十数μmの非磁性トナー粒子
との混合から成る現像剤も用いられるが、繊細な
線や点あるいは濃淡差等を再現した高画質画像を
得るためには、重量平均粒径が１〜20μmのトナ
ー粒と重量平均粒径が５〜50μmの磁性キヤリヤ
粒子との混合から成る現像剤を用いるのが好まし
く、さらに磁性キヤリヤ粒子が磁性体粒子の表面
を樹脂膜で被覆した粒子や磁性体微粒子を分散含
有した樹脂粒子の如き絶縁性の粒子であることが
現像剤搬送担体２に高いバイヤス電圧を印加でき
るので好ましい。キヤリヤ粒子の絶縁性は抵抗率
で108Ωcm以上、特に1013Ωcm以上であることが
好ましい。この抵抗率は、粒子を0.50cm2の断面積
を有する容器に入れてタツピングした後、詰めら
れた粒子上に１Kg／cm2の荷重を掛け、荷重と底面
電極との間に1000V／cmの電界が生ずる電圧を印
加したときの電流値を読み取ることで得られる値
であり、この抵抗率が低いと、現像剤搬送担体に
バイアス電圧を印加した場合に、キヤリヤ粒子に
電荷が注入されて、像担持体面にキヤリヤ粒子が
付着し易くなつたり、あるいはバイアス電圧のブ
レークダウンが起り易くなつたりする。 The developing device of the present invention is composed of a mixture of magnetic carrier particles with an average particle size of tens of micrometers to hundreds of micrometers and non-magnetic toner particles with an average particle diameter of tens of micrometers, similar to conventional two-component developers. Developers are also used, but in order to obtain high-quality images that reproduce delicate lines, dots, and differences in shading, toner particles with a weight average particle size of 1 to 20 μm and magnetic particles with a weight average particle size of 5 to 50 μm are used. It is preferable to use a developer mixed with carrier particles, and the magnetic carrier particles are insulating particles such as particles whose surfaces are coated with a resin film or resin particles containing fine magnetic particles dispersed therein. This is preferable because a high bias voltage can be applied to the developer transport carrier 2. The carrier particles preferably have an insulating property with a resistivity of 10 8 Ωcm or more, particularly 10 13 Ωcm or more. This resistivity is calculated by placing particles in a container with a cross-sectional area of 0.50 cm2 , tapping them, applying a load of 1Kg/ cm2 on the packed particles, and applying a voltage of 1000V/cm between the load and the bottom electrode. This value is obtained by reading the current value when a voltage that generates an electric field is applied. If this resistivity is low, when a bias voltage is applied to the developer transport carrier, charge is injected into the carrier particles. Carrier particles tend to adhere to the surface of the image carrier, or breakdown of the bias voltage tends to occur.
本発明現像装置によれば、先に述べたように、
現像剤搬送担体２に現像剤層を像形成体１に接触
させずに適当に薄く均一に形成することができる
から、振動電界によるトナー粒子の移行制御が容
易になり、したがつて、トナー粒子やキヤリヤ粒
子に微粒子化したものを用いても、現像剤層から
トナー粒子のみを分離して像形成体の静電像等に
付着させることが容易に行われ、その結果、高画
質画像を得ることができる。 According to the developing device of the present invention, as mentioned above,
Since the developer layer can be appropriately thin and uniformly formed on the developer transport carrier 2 without contacting the image forming body 1, it becomes easy to control the transfer of toner particles using an oscillating electric field, and therefore the toner particles Even if fine particles are used as carrier particles, it is easy to separate only the toner particles from the developer layer and attach them to the electrostatic image on the image forming body, and as a result, a high-quality image can be obtained. be able to.
次に本発明の具体的実施例を示す。 Next, specific examples of the present invention will be shown.
第１図の現像装置において、現像剤搬送担体２
を、サンドブラストにより粗面としたＡ製のス
リーブ２ａの表面に、微粒鉄粉を含有した樹脂液
にデイピングする方法で形成した厚さ約50μmの
磁性層２ｂを有する、外径が30mmの反時計方向に
65rpmで回転するものとし、スリーブ２ａの内部
の磁石体５を、表面に磁束密度900ガウスのＮ，
Ｓ磁極８極を周方向に等間隔に有する、矢印方向
の回転数が700rpmのものとした。そして、現像
剤Ｄには重量平均粒径が30μm程度で樹脂中に磁
性体粉末を分散含有した比抵抗が約１×1014Ωcm
の絶縁性キヤリヤ粒子と重量平均粒径が14μmの
絶縁性非磁性トナー粒子とから成る現像剤を用い
て、層厚規制プレード７と現像剤搬送担体２の間
隙を400μmにして、層厚約500μmの現像剤層が現
像剤搬送担体２に形成されるようにした。この現
像剤搬送担体２を、有機光導電体OPCから成る
像形成層を有して矢印方向に120mm／secの表面速
度で回転し、像形成層に非画像背景部電位−50V
に対して−500Vの静電潜像を形成される、像形
成体１と表面間隙700μmで対峙させるようにし
て、バイヤス電源３により現像剤搬送担体２に
2kHz，1kVの交流電圧と−15〇Ｖの直流電圧の
重畳したバイアス電圧を印加した現像を行つた。
In the developing device shown in FIG.
A counterclockwise magnetic layer 2b with an outer diameter of 30 mm is formed on the surface of a sleeve 2a made of A whose surface has been roughened by sandblasting, and has a magnetic layer 2b with a thickness of about 50 μm formed by dipping in a resin liquid containing fine iron powder. in the direction
It is assumed that the magnet body 5 inside the sleeve 2a is rotated at 65 rpm, and the magnet body 5 inside the sleeve 2a is heated with N, with a magnetic flux density of 900 Gauss, on the surface.
It has 8 S magnetic poles at equal intervals in the circumferential direction, and the rotation speed in the direction of the arrow is 700 rpm. Developer D has a weight average particle diameter of about 30 μm and contains magnetic powder dispersed in the resin, and has a specific resistance of about 1×10 14 Ωcm.
Using a developer consisting of insulating carrier particles and insulating non-magnetic toner particles with a weight average particle diameter of 14 μm, the gap between the layer thickness regulating plate 7 and the developer transport carrier 2 is set to 400 μm, and the layer thickness is approximately 500 μm. The developer layer was formed on the developer transport carrier 2. This developer transport carrier 2, which has an image forming layer made of an organic photoconductor OPC, is rotated at a surface speed of 120 mm/sec in the direction of the arrow, and the non-image background potential of the image forming layer is -50 V.
A bias power source 3 is used to apply a charge to the developer transport carrier 2 so that it faces the image forming member 1, on which an electrostatic latent image of -500 V is formed, with a surface gap of 700 μm.
Development was carried out by applying a bias voltage of 2kHz, 1kV AC voltage and -150V DC voltage.
現像されたトナー像は、図示してない転写装置
により普通紙にコロナ放電転写され、表面温度
140℃の熱ローラ定着装置によつて定着された。
それによつて得られた記録画像は、かぶりやエツ
ジ効果のない、そして濃度も高いきわめて鮮明な
ものであり、引続いて同様に５万枚の記録紙を得
たが、最初から最後まで安定して変わらない鮮明
な記録画像が得られた。 The developed toner image is transferred by corona discharge onto plain paper by a transfer device (not shown), and the surface temperature is
It was fixed by a heat roller fixing device at 140°C.
The recorded images thus obtained were extremely clear, with no fogging or edge effects, and of high density.Subsequently, 50,000 sheets of recording paper were obtained in the same manner, and they remained stable from beginning to end. A clear recorded image was obtained that remained unchanged.
これに対して、現像剤搬送担体に磁性層を有し
ないものを用いた場合は、層厚規制ブレード７の
所で現像剤等の詰りが生じ易く、したがつて、現
像剤層の層厚も不同となり、トナー像にキヤリヤ
粒子の付着も起り易くて、１万枚程度の記録紙を
得るのが限度であり、記録画像には荒れが認めら
れた。 On the other hand, when a developer transport carrier that does not have a magnetic layer is used, clogging of developer etc. is likely to occur at the layer thickness regulating blade 7, and therefore the layer thickness of the developer layer is also reduced. The toner image was uneven and carrier particles were likely to adhere to the toner image, so that the maximum number of recording sheets that could be obtained was about 10,000 sheets, and roughness was observed in the recorded image.
本発明の現像装置によれば、現像剤搬送担体に
適当な均一厚さの現像剤装置を形成することがで
き、したがつて、振動電界による現像剤層からの
トナー粒子の移行制御が効果的に行われて、かぶ
りやエツジ効果のない鮮明な記録画像を得ること
ができる。
According to the developing device of the present invention, it is possible to form a developer device with an appropriate uniform thickness on the developer transport carrier, and therefore, the transfer of toner particles from the developer layer by the oscillating electric field can be effectively controlled. It is possible to obtain clear recorded images without fog or edge effects.
第１図は本発明現像装置の一例を示す記録装置
の部分断面図、第２図及び第３図はそれぞれ現像
剤搬送担体の構成の一例を示す斜視図である。
１……像形成体、２……現像剤搬送担体、２ａ
……スリーブ、２ｂ……磁性層、３……バイヤス
電源、４……保護抵抗、５……磁石体、６……現
像剤溜り、７……層厚規制ブレード、８……クリ
ーニングブレード、９……攪拌ローラ、１０……
トナー補給ローラ、１１……トナーホツパー。
FIG. 1 is a partial sectional view of a recording device showing an example of the developing device of the present invention, and FIGS. 2 and 3 are perspective views showing an example of the structure of a developer transport carrier, respectively. 1... Image forming body, 2... Developer transport carrier, 2a
... Sleeve, 2b ... Magnetic layer, 3 ... Bias power supply, 4 ... Protective resistor, 5 ... Magnet, 6 ... Developer reservoir, 7 ... Layer thickness regulation blade, 8 ... Cleaning blade, 9 ...Stirring roller, 10...
Toner supply roller, 11... Toner hopper.
Claims (1)
の表面に磁性キヤリヤ粒子とトナー粒子の混合か
ら成る二成分現像剤の層を形成して、振動電界下
で現像剤層から像形成体の潜像にトナー粒子を付
着させる現像装置において、前記現像剤搬送担体
が表面に沿つた磁性層を有することを特徴とする
現像装置。 ２ 前記現像剤層が像形成体の表面と接触しない
ように現像剤搬送担体面上に形成される特許請求
の範囲第１項記載の現像装置。 ３ 前記磁性層が磁性体のめつき層である特許請
求の範囲第１項または第２項記載の現像装置。 ４ 前記磁性層が磁性体粒子を含む層である特許
請求の範囲第１項または第２項記載の現像装置。 ５ 前記現像剤搬送担体の表面が絶縁性乃至は半
絶縁性である特許請求の範囲第１項乃至第４項記
載の現像装置。[Claims] 1. A two-component developer layer consisting of a mixture of magnetic carrier particles and toner particles is formed on the surface of a sleeve-shaped developer transport carrier containing a magnet, and the developer layer is separated from the developer layer under an oscillating electric field. 1. A developing device for attaching toner particles to a latent image on an image forming member, wherein the developer transporting carrier has a magnetic layer along the surface thereof. 2. The developing device according to claim 1, wherein the developer layer is formed on the surface of the developer transporting carrier so as not to come into contact with the surface of the image forming body. 3. The developing device according to claim 1 or 2, wherein the magnetic layer is a plating layer of magnetic material. 4. The developing device according to claim 1 or 2, wherein the magnetic layer is a layer containing magnetic particles. 5. The developing device according to any one of claims 1 to 4, wherein the surface of the developer transport carrier is insulating or semi-insulating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23893783A JPS60130770A (en) | 1983-12-20 | 1983-12-20 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23893783A JPS60130770A (en) | 1983-12-20 | 1983-12-20 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60130770A JPS60130770A (en) | 1985-07-12 |
| JPH047509B2 true JPH047509B2 (en) | 1992-02-12 |
Family
ID=17037492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23893783A Granted JPS60130770A (en) | 1983-12-20 | 1983-12-20 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60130770A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61116371A (en) * | 1984-11-10 | 1986-06-03 | Matsushita Electric Ind Co Ltd | Electrophotographic device |
| JPH11194618A (en) | 1997-11-10 | 1999-07-21 | Canon Inc | Image forming device |
-
1983
- 1983-12-20 JP JP23893783A patent/JPS60130770A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60130770A (en) | 1985-07-12 |
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