JPH0469900B2 - - Google Patents
Info
- Publication number
- JPH0469900B2 JPH0469900B2 JP59133346A JP13334684A JPH0469900B2 JP H0469900 B2 JPH0469900 B2 JP H0469900B2 JP 59133346 A JP59133346 A JP 59133346A JP 13334684 A JP13334684 A JP 13334684A JP H0469900 B2 JPH0469900 B2 JP H0469900B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- layer
- toner particles
- carrier
- developing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002245 particle Substances 0.000 claims description 68
- 230000001105 regulatory effect Effects 0.000 claims description 33
- 230000005684 electric field Effects 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000012212 insulator Substances 0.000 description 2
- 239000006249 magnetic particle Substances 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
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010408 sweeping Methods 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電子写真法、静電記録法、静電印刷
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、複数の磁極を周上に配
設した磁石体内蔵の現像剤搬送担体の外周面に磁
性キヤリヤ粒子とトナー粒子が混合した所謂二成
分現像剤の層を像形成体の面と接触しない層厚に
形成し、振動電界下で該現像剤層からトナー粒子
を飛翔させて像形成体の静電潜像に付着させる現
像装置の改良に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to an electrostatic latent image or a magnetic latent image formed on the surface of an image forming body by electrophotography, electrostatic recording, electrostatic printing, etc. Regarding the developing device of a recording device to which toner particles are attached, in particular, a so-called two-component developer in which magnetic carrier particles and toner particles are mixed on the outer circumferential surface of a developer transporting carrier with a built-in magnet body having a plurality of magnetic poles arranged on the circumference. The present invention relates to an improvement in a developing device in which a layer is formed to a thickness that does not contact the surface of an image forming member, and toner particles are caused to fly from the developer layer under an oscillating electric field and adhere to an electrostatic latent image on an image forming member.
上述のような現像装置として、特開昭56−
144452号、同57−139761号、同57−147652号、同
58−48065号各公報に記載されたものが知られて
いる。これらの現像装置は、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、トナー粒子の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、振動電界で現像剤
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し
たものである。
As a developing device such as the one mentioned above,
No. 144452, No. 57-139761, No. 57-147652, No. 57-139761, No. 57-147652, No.
58-48065 and those described in each publication are known. By using a two-component developer, these developing devices can more easily control the triboelectric charging of toner particles than those using a single-component developer for magnetic toner particles, and are less prone to agglomeration of toner particles. As a result, it becomes easier to uniformly form a developer layer 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 an oscillating electric field. Therefore, 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, thereby eliminating the sweeping that is likely to occur when the developer layer is brought into contact with the image forming body. This allows development to be carried out without eyes or fog.
しかし、このような現像装置においても、現像
に不均一性やかぶりの生ずることがある。これを
防止するためには、現像剤層を均一な薄層に形成
することが有効である。 However, even in such a developing device, non-uniformity and fog may occur in the development. In order to prevent this, it is effective to form the developer layer into a uniform thin layer.
しかるに、従来の現像装置は、現像剤層の通過
ゲートを形成している層厚規制部材のみで現像剤
層の層厚を規制しているため、現像剤搬送担体表
面に現像剤を吸着する磁界の強さの変動や層厚規
制部材の現像剤搬送担体に対する狭い間隙の規制
部にごみや現像剤の凝集したものが詰り易くなる
こと等から、層厚を薄く規制する程層厚のむらが
大きくなり、現像剤層を薄く均一に形成すること
が困難であつた。この問題は、特に、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、従来の平均粒径が数十〜数百μmの磁性
キヤリヤ粒子や平均粒径が十数μmのトナー粒子
よりも微粒子化した二成分現像剤を用いるように
した場合、現像剤が凝集し易いこと等から、一層
顕著となる。そして、層厚の規制むらが現像むら
となつて現われ易いと言う問題もある。 However, in conventional developing devices, the thickness of the developer layer is regulated only by a layer thickness regulating member that forms a passage gate for the developer layer. The thinner the layer thickness is, the more uneven the layer thickness becomes. Therefore, it was difficult to form a thin and uniform developer layer. This problem is particularly important in order to obtain high-quality images that reproduce delicate lines, dots, and differences in shading. When a two-component developer whose particles are finer than that of the toner particles is used, the problem becomes even more noticeable because the developer tends to aggregate. There is also the problem that irregularities in regulating layer thickness tend to appear as development irregularities.
一方、現像剤層を像形成体面に接触させる磁気
ブラシ現像装置において、層厚規制部材を通過し
た磁気ブラシが押えられていた状態から膨張して
トナー粒子を飛散させ、それによつてかぶり等が
生ずるようになるのを防止するために、非磁性材
料から成る層厚規制部材に磁性片を設けたり、層
厚規制部材を通過した磁気ブラシのトナー粒子が
帯電不足になつて飛散したり、かぶりを生ぜしめ
易くなつたりするのを防止するために、層厚規制
部材を通過した直後の磁気ブラシに接触してトナ
ー粒子を帯電させる非磁性弾性材料から成るブレ
ードを設けたりする方法が実開昭54−107336号公
報報と同57−9797号公報により知られている。 On the other hand, in a magnetic brush developing device that brings the developer layer into contact with the surface of the image forming body, the magnetic brush that has passed through the layer thickness regulating member expands from the pressed state and scatters toner particles, thereby causing fogging, etc. In order to prevent this, a magnetic piece is provided on the layer thickness regulating member made of a non-magnetic material, and the toner particles of the magnetic brush that have passed through the layer thickness regulating member become insufficiently charged and scatter, or fogging occurs. In order to prevent this from becoming more likely to occur, a method was developed in 1972, in which a blade made of a non-magnetic elastic material was provided that charged the toner particles by contacting the magnetic brush immediately after passing through the layer thickness regulating member. It is known from Publication No. 107336 and No. 57-9797.
〔発明の目的〕
本発明は、上記従来技術を背景としてなされた
ものであり、本発明者らが、現像剤層を薄く均一
に形成すると言う非接触現像装置における要望に
実開昭54−107336号および同57−9797号両公報の
技術が応え得るか否かを検討した結果、層厚規制
部材に磁性片を設ける方法は見るべき効果が得ら
れないが、ブレードを設ける方法は、層厚規制部
材の現像剤搬送担体に対する間〓を極端に狭くし
なければ、ブレードを均し部材として用いること
により、薄く形成した現像剤層の層厚の均一化に
効果が有ることを見出し、この知見に基いてなさ
れたものである。[Object of the Invention] The present invention was made against the background of the above-mentioned prior art, and the present inventors responded to the request for a non-contact developing device to form a thin and uniform developer layer in accordance with U.S. Pat. As a result of examining whether the techniques of both No. 1 and No. 57-9797 can meet the requirements, we found that the method of providing a magnetic piece in the layer thickness regulating member did not produce the desired effect, but the method of providing a blade did not We discovered that, as long as the distance between the regulating member and the developer transport carrier is not extremely narrow, using a blade as a leveling member is effective in making the thickness of the thin developer layer uniform. This was done based on.
すなわち、本発明は、現像剤搬送担体上に現像
剤層を薄く均一に形成することができ、現像剤層
を像形成体に接触させずに振動電界下で現像剤層
からトナー粒子を飛翔させて、不均一性やかぶり
のない鮮明なトナー像を現像することができる現
像装置の提供を目的としてなされたものである。 That is, in the present invention, a developer layer can be formed thinly and uniformly on a developer transport carrier, and toner particles are caused to fly from the developer layer under an oscillating electric field without bringing the developer layer into contact with an image forming body. The purpose of this invention is to provide a developing device capable of developing a clear toner image free from non-uniformity and fogging.
本発明は、磁性キヤリヤ粒子とトナー粒子が混
合した現像剤の層を複数の磁極を周上に配設した
磁石体内蔵の現像剤搬送担体の外周面に像形成体
の面と接触しない層厚に形成し、振動電界下で該
現像剤層からトナー粒子を飛翔させて像形成体の
静電潜像に付着させる現像装置において、前記磁
石体を現像剤搬送担体の外周面が像形成体の面に
近接した現像域の前後にN,S磁極を配設して現
像域の磁力線が現像剤搬送担体の外周面にほぼ平
行になるようにした静止磁石体とし、前記現像剤
層の層厚を規制する層厚規制部材の現像剤搬送担
体に対する間〓以上の現像剤搬送担体に対する間
〓をもつて前記層厚規制部材で層厚を規制された
現像剤層に接触する均し部材を層厚規制部材に近
接して設けたことを特徴とする現像装置にあり、
この構成によつて上記目的を達成したものであ
る。
The present invention provides a layer of developer containing a mixture of magnetic carrier particles and toner particles on the outer circumferential surface of a developer transporting carrier having a built-in magnet and having a plurality of magnetic poles disposed on its circumference, to a thickness that does not make contact with the surface of an image forming body. In a developing device in which toner particles are formed on a developer layer and attached to an electrostatic latent image on an image forming body by flying toner particles from the developer layer under an oscillating electric field, the magnetic body is attached to a surface where the outer peripheral surface of the developer transporting carrier is on the surface of the image forming body. A stationary magnet body is used in which N and S magnetic poles are arranged before and after a developing area close to the surface so that the lines of magnetic force in the developing area are approximately parallel to the outer circumferential surface of the developer transport carrier, and the layer thickness of the developer layer is A leveling member is placed in contact with the developer layer whose layer thickness is regulated by the layer thickness regulating member, with a distance between the layer thickness regulating member and the developer transporting carrier that regulates the thickness of the layer and the developer transporting carrier. A developing device characterized in that it is provided close to a thickness regulating member,
This configuration achieves the above object.
以下、本発明を図示例を参照して説明する。 Hereinafter, the present invention will be explained with reference to illustrated examples.
1図および第2,3図は本発明現像装置の一例
を示す概要断面図およびそれぞれ部分断面図であ
る。 1 and 2 and 3 are a schematic sectional view and a partial sectional view, respectively, showing an example of the developing device of the present invention.
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、滑らかな表面あるいは10〜500μm程
度の凹凸のある表面を有する現像剤搬送担体であ
り、通常アルミニウムやステンレス鋼のような導
電性を有する非磁性材料で形成される。この現像
剤搬送担体2の表面は樹脂や酸化被覆によつて絶
縁性乃至は半絶縁性にされていることが好まし
い。現像剤搬送担体2の表面を絶縁性乃至は半絶
縁性にすると、現像剤搬送担体2にバイアス電圧
を印加してそれにより現像域Aに振動電界を生ぜ
しめるようにしても、落電現像のような絶縁破壊
が生じにくくなり、そのために現像剤搬送担体2
に十分なバイアス電圧を印加してトナー粒子の移
行制御を行うことが容易になる。 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, which rotates in the direction of the arrow, is a developer transport carrier having a smooth surface or an uneven surface of about 10 to 500 μm, and is usually made of conductive non-magnetic material such as aluminum or stainless steel. formed of material. The surface of the developer transport carrier 2 is preferably made insulating or semi-insulating by a resin or oxide coating. When the surface of the developer transport carrier 2 is made insulating or semi-insulating, even if a bias voltage is applied to the developer transport carrier 2 and thereby an oscillating electric field is generated in the development area A, electrodrop development will not occur. Therefore, the developer transport carrier 2
It becomes easy to apply a sufficient bias voltage to control the transfer of toner particles.
3は、保護抵抗4を介して現像剤搬送担体2に
バイアス電圧を印加し、基体部を接地された像形
成体1と現像剤搬送担体2の間に振動電界を形成
するバイアス電源、5は、現像剤搬送担体2の内
部に設けられた磁石体である。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。 3 is a bias power supply that applies a bias voltage to the developer transport carrier 2 via the protective resistor 4 and forms an oscillating electric field between the image forming body 1 whose base portion is grounded and the developer transport carrier 2; , which is a magnet provided inside 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,
The N and S magnetic poles are normally magnetized to a magnetic flux density of 500 to 1500 Gauss.
静止し、現像剤搬送担体2が左方向に回転し
て、磁石体5のN,S磁極の磁力により現像剤溜
り6の現像剤が磁性キヤリヤ粒子にトナー粒子を
伴う形で現像剤搬送担体2の表面に吸着され、吸
着された現像剤が現像剤搬送担体2の上記回転に
よつて同方向に移動するようになり、非磁性また
は磁性材料から成る層厚規制部材7によつて層厚
を規制されて現像剤層の形成が行われるものであ
る。そして、磁石体5における磁極N,Sの配設
が、現像域Aの前後にN,S磁極を配設している
ことで、現像域Aにおいて、現像剤搬送担体2と
像形成体1の表面に略平行な磁界を形成するもの
である。これによつて、現像域Aにおける現像剤
層が低く薄層に押さえられ、したがつて、現像剤
搬送担体2と層厚規制部材7との間〓を広げられ
る一方、現像剤搬送担体2の像形成体1に対する
間〓をより狭くすることができて、振動電界によ
るトナー粒子の移行制御を容易にできる。 The developer transporting carrier 2 is stationary, and the developer transporting carrier 2 rotates to the left, and the developer in the developer reservoir 6 is transferred to the developer transporting carrier 2 in the form of toner particles attached to magnetic carrier particles due to the magnetic force of the N and S magnetic poles of the magnet body 5. The adsorbed developer is moved in the same direction by the rotation of the developer transport carrier 2, and the layer thickness is controlled by the layer thickness regulating member 7 made of a non-magnetic or magnetic material. The formation of the developer layer is regulated. The arrangement of the magnetic poles N and S in the magnet body 5 is such that the N and S magnetic poles are arranged before and after the developing area A. It forms a magnetic field approximately parallel to the surface. As a result, the developer layer in the developing area A is kept low and thin, and the gap between the developer transport carrier 2 and the layer thickness regulating member 7 can be widened, while the developer layer in the developer transport carrier 2 is kept thin. The distance to the image forming body 1 can be further narrowed, and the movement of toner particles can be easily controlled by the oscillating electric field.
すなわち、この現像装置は、現像域Aにおい
て、現像剤搬送担体2上の現像剤層が像形成体1
の表面に接触せず、振動電界下で現像剤層からト
ナー粒子が飛翔して像形成体1の潜像に付着する
条件で用いられる。 That is, in this developing device, in the developing area A, the developer layer on the developer transport carrier 2 is located on the image forming body 1.
The toner particles are used under conditions such that toner particles fly from the developer layer under an oscillating electric field and adhere to the latent image on the image forming body 1 without contacting the surface of the image forming member 1 .
8は現像域Aを通過して現像剤搬送担体2上に
残留した現像剤層を現像剤溜り6に還元するクリ
ーニングブレード、9は現像剤溜り6の現像剤を
撹拌して均一に混合すると共に、トナー粒子を摩
擦帯電させる撹拌ローラ、10はトナーホツパー
11から現像剤溜り6にトナー粒子を補給するト
ナー補給ローラである。 A cleaning blade 8 returns the developer layer remaining on the developer transport carrier 2 after passing through the development area A to the developer reservoir 6, and a cleaning blade 9 stirs the developer in the developer reservoir 6 to mix it uniformly. , a stirring roller that frictionally charges the toner particles, and 10 a toner supply roller that supplies toner particles from the toner hopper 11 to the developer reservoir 6.
本発明現像装置は、以上のような現像装置に対
して、現像剤搬送担体2に対する間隙が層厚規制
部材7の間隙以上で、層厚規制部材7によつて形
成された直後の現像剤層に接触するようになる均
し部材12を設けるようにしたものである。 In the developing device of the present invention, the gap between the developer transport carrier 2 and the layer thickness regulating member 7 is greater than or equal to the gap between the layer thickness regulating member 7 and the developer layer immediately after being formed by the layer thickness regulating member 7. A leveling member 12 is provided which comes into contact with the surface.
第1,2図の現像装置における均し部材12は
剛性体から成つており、第3図の現像装置におけ
る均し部材12は弾性体から成つている。そし
て、第1,2,4図の均し部材12は板状の面が
現像剤層に接触して表面を均すようなものである
が、第2図の均し部材12は肉厚板状の端面が現
像剤層に接触して均すようなものである。 The leveling member 12 in the developing device shown in FIGS. 1 and 2 is made of a rigid body, and the leveling member 12 in the developing device shown in FIG. 3 is made of an elastic body. The leveling member 12 in FIGS. 1, 2, and 4 has a plate-like surface that comes into contact with the developer layer to level the surface, but the leveling member 12 in FIG. 2 is a thick plate. The end surface of the shape comes into contact with the developer layer to level it.
このような均し部材12を設けたことによつ
て、層厚規制部材7の現像剤搬送担体2に対する
間隙を磁力線が現像剤搬送担体2の外周面にほぼ
平行になつている現像域Aで像形成体1に非接触
の現像剤層が得られるように狭め、そのために現
像剤層の層厚の相対的変動が大きくなつたとして
も、その変動は均し部材12により均らされる結
果、薄層で均一な現像剤層の形成が可能となる。
すなわち、均し部材12によつて層厚規制部材7
における規制部の目詰りにより生じ易い筋むらも
消滅するようになる。したがつて、現像剤搬送担
体2の像形成体1に対する間隙を適当に狭くし
て、現像域Aにおける振動電界によりトナー粒子
の移行制御を効果的に行うようにする条件が容易
に設定できることとなり、不均一性やかぶりのな
い鮮明なトナー像を現像することができる。 By providing such a leveling member 12, the gap between the layer thickness regulating member 7 and the developer transport carrier 2 can be adjusted in the developing area A where the lines of magnetic force are approximately parallel to the outer peripheral surface of the developer transport carrier 2. Even if the thickness is narrowed so that a non-contact developer layer is obtained on the image forming body 1, and therefore the relative variation in the thickness of the developer layer becomes large, the variation is smoothed out by the leveling member 12. , it becomes possible to form a thin and uniform developer layer.
That is, the layer thickness regulating member 7 is controlled by the leveling member 12.
The streaks that tend to occur due to clogging of the regulating section in the filter also disappear. Therefore, conditions can be easily set to appropriately narrow the gap between the developer transport carrier 2 and the image forming body 1 and to effectively control the transfer of toner particles by the oscillating electric field in the development area A. , it is possible to develop clear toner images without non-uniformity or fogging.
この均し部材12は、層厚規制部材7のように
現像剤の通過ゲートを形成するものでも、また実
開昭57−9797号公報のブレードのようにトナー粒
子を摩擦帯電させるものでもないから、均し部材
12の位置で現像剤が掻き溜められて、それが原
因で目詰りを起したりすることはない。したがつ
て、第1,2図の例のように、均し部材12を剛
性体とすることができるし、剛性体とした場合
は、弾性体とした場合よりも、弾性変位すること
がないだけ現像剤層の層厚を一層均一にする。し
かし、層厚規制部材7によつて規制された現像剤
層の層厚の変動が大きかつたり、現像剤層にトナ
ー粒子の凝集したものなどが含まれるような場合
は、均し部材12を弾性体とすることがそのよう
な現像剤を滞溜させない上で無難である。均し部
材12は板状のものに限らず、剛性体のものは円
柱状のものとしてもよいし、弾性体のものは目の
細かなブラシ状としてもよい。 This leveling member 12 does not form a developer passage gate like the layer thickness regulating member 7, nor does it triboelectrically charge toner particles like the blade in Japanese Utility Model Application Publication No. 57-9797. , developer is not accumulated at the leveling member 12 and clogging does not occur due to this. Therefore, as in the example shown in FIGS. 1 and 2, the leveling member 12 can be made of a rigid body, and when it is made of a rigid body, it is less likely to undergo elastic displacement than when it is made of an elastic body. To make the thickness of the developer layer more uniform. However, if the thickness of the developer layer regulated by the layer thickness regulating member 7 varies greatly or the developer layer contains aggregated toner particles, the leveling member 12 may be used. It is safe to use an elastic body to prevent such developer from accumulating. The leveling member 12 is not limited to a plate-like member, and a rigid member may be a cylindrical member, and an elastic member may be a fine-mesh brush member.
そして、本発明現像装置は、現像域Aに高い振
動電界を生ぜしめて現像を行うものであるから、
均し部材12を電界のブレークダウンの原因とな
らないように層厚規制部材7に近接して下流側に
設けている。さらに、均し部材12をブレークダ
ウンの原因としないためには、均し部材12を絶
縁状態のもの(絶縁材料で形成したものか、絶縁
物を介して支持したもの)とするか、あるいは、
均し部材12に振動電界を形成するための電圧と
同じ乃至は同様の電圧を印加するのが好ましい。
このことは層厚規制ブレード7に関しても同様で
ある。なお、均し部材12を導電性材料で形成し
て接地すると、ブレークダウンが起り易い。ま
た、現像域Aに振動電界を生ぜしめるのは、第1
図の例に限らず、現像域Aにトナー粒子の移行を
妨げないワイヤー電極やネツト電極のような制御
電極を設けて、それに振動電圧を印加することに
よるものでもよい。 Since the developing device of the present invention performs development by generating a high oscillating electric field in the developing area A,
The leveling member 12 is provided close to the layer thickness regulating member 7 on the downstream side so as not to cause breakdown of the electric field. Furthermore, in order to prevent the leveling member 12 from causing breakdown, the leveling member 12 should be insulated (made of an insulating material or supported via an insulator), or
It is preferable to apply the same or similar voltage to the voltage for forming the oscillating electric field to the leveling member 12.
This also applies to the layer thickness regulating blade 7. Note that if the leveling member 12 is made of a conductive material and grounded, breakdown is likely to occur. Furthermore, the oscillating electric field is generated in the development area A by the first
The present invention is not limited to the example shown in the figure, but a control electrode such as a wire electrode or a net electrode that does not impede the transfer of toner particles may be provided in the development area A, and an oscillating voltage may be applied thereto.
均し部材12は磁性体から成るものでも、非磁
性体から成るものでもよいが、現像剤層の通過性
を妨げない点で非磁性体から成るものが好まし
い。第1図や第2図に示したような剛性の均し部
材12には厚さ約2mmのアルミニウム板で形成し
たようなものが好ましく用いられ、同様の形状の
弾性体から成る均し部材12や第3図に示したよ
うな弾性の均し部材12には厚さ約50μmのポリ
エチレンテレフタレート板で形成したようなもの
が好ましく用いられる。アルミニウム板で形成し
た均し部材12は絶縁物を介して支持され、ある
いはさらに電圧を印加されることは先に述べた通
りである。勿論、剛性の均し部材12に樹脂材料
や他の金属材料を用いたり、弾性の均し部材12
に他の樹脂板や厚さ20〜300μmのりん青銅板、
ステンレス鋼板等を用いたりすることができる。
均し部材12を樹脂材料で形成した場合は、均し
部材12が特にトナー粒子を摩擦帯電させるため
のものではなくても、トナー粒子に摩擦帯電を与
えるようになるから、少なくとも好ましくない逆
極性に帯電したトナーを生じさせることのない材
質を用いるのが好ましい。 The leveling member 12 may be made of a magnetic material or a non-magnetic material, but it is preferably made of a non-magnetic material since it does not impede the passage of the developer layer. The rigid leveling member 12 shown in FIGS. 1 and 2 is preferably made of an aluminum plate with a thickness of about 2 mm, and the leveling member 12 made of an elastic body having a similar shape is preferably used. The elastic leveling member 12 shown in FIG. 3 is preferably made of a polyethylene terephthalate plate having a thickness of about 50 μm. As described above, the leveling member 12 formed of an aluminum plate is supported via an insulator or is further applied with a voltage. Of course, a resin material or other metal material may be used for the rigid leveling member 12, or an elastic leveling member 12 may be used.
Other resin plates and phosphor bronze plates with a thickness of 20 to 300 μm,
A stainless steel plate or the like may be used.
When the leveling member 12 is made of a resin material, even if the leveling member 12 is not specifically designed to triboelectrically charge the toner particles, it imparts triboelectricity to the toner particles, so at least undesirable reverse polarity can be avoided. It is preferable to use a material that does not generate highly charged toner.
以上のような均し部材12の取付けは、ねじや
リベツト等で現像剤搬送担体2との間隙を調節可
能になされることが好ましいが、それに限らず、
接着剤等により固定的に行われてもよい。また、
均し部材12の取付け位置は、磁石体5の磁極か
ら近い位置に設けるのが好ましい。この時の均し
部材の位置での磁界は300ガウス以上好ましくは
500〜1000ガウスが好ましい。このような磁界位
置では現像剤搬送担体2の現像剤層搬送力が強
く、したがつて、均し部材12が現像剤層の通過
を妨げて必要以上に現像剤を掻き溜めることが防
止される。 It is preferable that the leveling member 12 is installed as described above so that the gap between it and the developer transport carrier 2 can be adjusted using screws, rivets, etc.; however, the leveling member 12 is not limited thereto.
It may be fixed with adhesive or the like. Also,
The leveling member 12 is preferably installed at a position close to the magnetic poles of the magnet body 5. At this time, the magnetic field at the leveling member position is preferably 300 Gauss or more.
500-1000 Gauss is preferred. At such a magnetic field position, the developer layer conveying force of the developer conveying carrier 2 is strong, so that the leveling member 12 is prevented from blocking the passage of the developer layer and collecting more developer than necessary. .
以上述べたように、均し部材12を設けた本発
明の現像装置によれば、現像剤搬送担体2上に現
像剤層を均一に薄く形成することができて、不均
一性やかぶりのない鮮明なトナー像を現像するこ
とができる。そのための非接触現像条件として
は、像形成体1に対して現像剤搬送担体2を数10
〜2000μmの表面間隙に保ち、現像剤層を層厚規
制ブレード7と均し部材12により像形成体1の
表面に接触させずに近接させる均一な層厚に形成
することが好ましい。像形成体1と現像剤搬送担
体2の表面間隙を狭くし過ぎると、現像剤層を現
像剤搬送担体2の表面に一様に形成することが困
難となり、トナー粒子を現像域Aに十分に供給す
ることができなくなつて、鮮明な現像を行うこと
が難しくなる。また、表面間隙が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
の移行制御が効果的に行われなくなり、十分な現
像濃度が得られなくなる。そして、表面間隙を数
10〜2000μmの範囲、好ましくは500〜1500μmに
すると、現像剤層を適当な100〜1000μmの厚さ
で現像剤搬送担体2の表面に均一に形成でき、振
動電界により効果的にトナー粒子の移行制御を行
うことができる。 As described above, according to the developing device of the present invention provided with the leveling member 12, the developer layer can be formed uniformly and thinly on the developer transport carrier 2, and there is no non-uniformity or fog. A clear toner image can be developed. As a non-contact development condition for this purpose, the number of developer transport carriers 2 to the image forming body 1 is several tens of times.
It is preferable to maintain a surface gap of ~2000 μm and form the developer layer to a uniform layer thickness so that it is brought close to the surface of the image forming body 1 without contacting it using the layer thickness regulating blade 7 and the leveling member 12. If the surface gap between the image forming member 1 and the developer transport carrier 2 is made too narrow, it will be difficult to uniformly form a developer layer on the surface of the developer transport carrier 2, and the toner particles will not be sufficiently distributed in the development area A. This makes it difficult to perform clear development. Furthermore, if the surface gap greatly exceeds 2000 μm, the toner particle transfer control by the oscillating electric field will not be performed effectively, making it impossible to obtain a sufficient developed density. Then, the surface gap is
When the thickness is in the range of 10 to 2000 μm, preferably 500 to 1500 μm, the developer layer can be uniformly formed on the surface of the developer transport carrier 2 with an appropriate thickness of 100 to 1000 μm, and the toner particles can be effectively transferred by the oscillating electric field. can be controlled.
現像剤層からトナー粒子を分離し易くするため
に現像剤搬送担体2と像形成体1の間に形成する
振動電界は、バイアス電源3で現像剤搬送担体2
に交流成分の実効値が200〜5000V、周波数が100
Hz〜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。 A bias power supply 3 generates an oscillating electric field between the developer transport carrier 2 and the image forming body 1 to facilitate separation of toner particles from the developer layer.
The effective value of the AC component is 200 to 5000V, and the frequency is 100V.
Hz~10kHz, preferably 300~4000V, 1~5kHz
By applying a bias voltage of , the effective value of
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 the occurrence of fogging. Of course, it can be used as
なお、現像域Aに制御電極を設けて、それにバ
イアス電圧を印加するようにした場合も、バイア
ス電圧に交流成分のほか直流成分も重畳し得るこ
とは勿論である。そしてこの場合さらに、現像剤
搬送担体2に直流電圧や交流電圧を印加すること
も行われる。この場合の現像剤搬送担体2に印加
する交流成分としては、制御電極に印加する交流
成分と異なつた振動数のものを用いてもよい。 Note that even in the case where a control electrode is provided in the development area A and a bias voltage is applied thereto, it goes without saying that the DC component as well as the AC component can be superimposed on the bias voltage. In this case, a DC voltage or an AC voltage is also applied to the developer transport carrier 2. In this case, the AC component applied to the developer transport carrier 2 may have a frequency different from that of the AC component applied to the control electrode.
現像剤搬送担体2や制御電極に印加するバイア
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。 The waveform of the AC component of the bias voltage applied to the developer transport carrier 2 and the control electrode is not limited to a sine wave, but may be a triangular wave or a rectangular wave. Furthermore, 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.
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
ー粒子と重量平均が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に高いバイアス電圧を印加でき
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、像形成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
レークダウンを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 10-odd μm to several hundred μm and non-magnetic toner particles with an average particle size of 10-odd μm, similar to conventional two-component developers. A developer is 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 a magnetic carrier with a weight average particle size of 5 to 50 μm are required. It is preferable to use a developer consisting of a mixture of magnetic particles and magnetic carrier particles, and furthermore, 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. 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 forming member, or bias voltage breakdown 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に現像剤層を安定して形成するこ
とができ、振動電界によるトナー粒子の移行制御
が効率的に行われるようになるから、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非
接触現像条件で現像剤層からトナー粒子を像形成
体1の潜像に移行させることが容易に行われ、そ
れによつて高画質画像を再現することができる。
なお、トナー粒子やキヤリヤ粒子の重量平均粒径
は、コールタカウンタ(コールタ社製)やオムニ
コンアルフア(ボツシユロム社製)で測定され
る。 According to the developing device of the present invention, as described above, the developer layer can be stably formed on the developer transport carrier 2, and the transfer of toner particles can be efficiently controlled by the oscillating electric field. Therefore, even if finely divided toner particles or carrier particles are used, the toner particles can be easily transferred from the developer layer to the latent image on the image forming member 1 under non-contact development conditions, thereby achieving high image quality. Images can be reproduced.
The weight average particle diameter of the toner particles and carrier particles is measured using a Coulter Counter (manufactured by Coulter) or Omnicon Alpha (manufactured by Botsulom).
本発明の現像装置によれば、現像剤搬送担体に
安定して現像域で均一な薄層の現像剤層を形成す
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を効果的に行うこ
とができて、微粒子化したキヤリヤ粒子やトナー
粒子から成る現像剤を用いても支障なく、鮮明性
に優れた高画質画像を再現することができると言
う優れた効果が得られる。
According to the developing device of the present invention, it is possible to stably form a uniform thin developer layer in the development area on the developer transport carrier, and therefore, the toner particles are transferred from the developer layer by the oscillating electric field. It has the excellent effect of being able to effectively control and reproducing high-quality images with excellent clarity even when using developers made of finely divided carrier particles and toner particles. can get.
1図および第2,3図は本発明現像装置の一例
を示す概略断図面およびそれぞれ部分断面図であ
る。
1…像形成体、2…現像剤搬送担体、3…バイ
アス電源、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…撹拌ローラ、10…トナー補給
ローラ、11…トナーホツパー、12…均し部
材。
1 and 2 and 3 are a schematic sectional view and a partial sectional view, respectively, showing an example of the developing device of the present invention. DESCRIPTION OF SYMBOLS 1... Image forming body, 2... Developer transport carrier, 3... Bias power supply, 4... Protective resistor, 5... Magnet, 6... Developer reservoir, 7... Layer thickness regulating blade, 8... Cleaning blade, 9... Stirring roller , 10... Toner supply roller, 11... Toner hopper, 12... Leveling member.
Claims (1)
像剤の層を複数の磁極を周上に配設した磁石体内
蔵の現像剤搬送担体の外周面に像形成体の面と接
触しない層厚に形成し、振動電界下で該現像剤層
からトナー粒子を飛翔させて像形成体の静電潜像
に付着させる現像装置において、前記磁石体を現
像剤搬送担体の外周面が像形成体の面に近接した
現像域の前後にN,S磁極を配設して現像域の磁
力線が現像剤搬送担体の外周面にほぼ平行になる
ようにした静止磁石体とし、前記現像剤層の層厚
を規制する層厚規制部材の現像剤搬送担体に対す
る間〓以上の現像剤搬送担体に対する間〓をもつ
て前記層厚規制部材で層厚を規制された現像剤層
に接触する均し部材を層厚規制部材に近接して設
けたことを特徴とする現像装置。 2 前記均し部材が剛性部材である特許請求の範
囲第1項記載の現像装置。 3 前記均し部材が弾性部材である特許請求の範
囲第1項記載の現像装置。 4 前記均し部材が前記磁石体の配設している一
つの磁極位置に近接して設けられている特許請求
の範囲第1項乃至第3項記載の現像装置。[Scope of Claims] 1. A developer layer containing a mixture of magnetic carrier particles and toner particles is brought into contact with the surface of an image forming body on the outer peripheral surface of a developer transporting carrier having a built-in magnet and having a plurality of magnetic poles disposed on its circumference. In a developing device in which toner particles are formed in a layer having a thickness such that the outer circumferential surface of a developer transporting carrier is not imaged, the toner particles are caused to fly from the developer layer under an oscillating electric field and adhere to an electrostatic latent image on an image forming member. A stationary magnet body has N and S magnetic poles arranged before and after a developing area close to the surface of the forming body so that the lines of magnetic force in the developing area are approximately parallel to the outer peripheral surface of the developer transport carrier, and the developer layer The layer thickness regulating member contacts the developer layer whose layer thickness is regulated by the layer thickness regulating member with a distance from the developer transporting carrier equal to or greater than the distance from the developer transporting carrier. A developing device characterized in that a member is provided close to a layer thickness regulating member. 2. The developing device according to claim 1, wherein the leveling member is a rigid member. 3. The developing device according to claim 1, wherein the leveling member is an elastic member. 4. The developing device according to any one of claims 1 to 3, wherein the leveling member is provided close to one magnetic pole position of the magnet body.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13334684A JPS6113269A (en) | 1984-06-29 | 1984-06-29 | Developing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13334684A JPS6113269A (en) | 1984-06-29 | 1984-06-29 | Developing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6113269A JPS6113269A (en) | 1986-01-21 |
JPH0469900B2 true JPH0469900B2 (en) | 1992-11-09 |
Family
ID=15102568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13334684A Granted JPS6113269A (en) | 1984-06-29 | 1984-06-29 | Developing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6113269A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2623552B2 (en) * | 1987-02-13 | 1997-06-25 | ミノルタ株式会社 | Electrostatic latent image developing device |
JPH0295049U (en) * | 1989-01-10 | 1990-07-27 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53133057A (en) * | 1977-04-25 | 1978-11-20 | Hokushin Electric Works | Device for measuring position or distance by using ultrasonic wave |
JPS57144575A (en) * | 1981-02-28 | 1982-09-07 | Mita Ind Co Ltd | Developing device of electrostatic copying machine |
JPS5898760A (en) * | 1981-12-08 | 1983-06-11 | Konishiroku Photo Ind Co Ltd | Magnetic brush developing method |
JPS58144863A (en) * | 1982-02-23 | 1983-08-29 | Toshiba Corp | Magnetic brush developing apparatus |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56159347U (en) * | 1980-04-24 | 1981-11-27 |
-
1984
- 1984-06-29 JP JP13334684A patent/JPS6113269A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53133057A (en) * | 1977-04-25 | 1978-11-20 | Hokushin Electric Works | Device for measuring position or distance by using ultrasonic wave |
JPS57144575A (en) * | 1981-02-28 | 1982-09-07 | Mita Ind Co Ltd | Developing device of electrostatic copying machine |
JPS5898760A (en) * | 1981-12-08 | 1983-06-11 | Konishiroku Photo Ind Co Ltd | Magnetic brush developing method |
JPS58144863A (en) * | 1982-02-23 | 1983-08-29 | Toshiba Corp | Magnetic brush developing apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS6113269A (en) | 1986-01-21 |
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