JPS61209466A - Electrophotographic device having plural developing devices - Google Patents
Electrophotographic device having plural developing devicesInfo
- Publication number
- JPS61209466A JPS61209466A JP60049356A JP4935685A JPS61209466A JP S61209466 A JPS61209466 A JP S61209466A JP 60049356 A JP60049356 A JP 60049356A JP 4935685 A JP4935685 A JP 4935685A JP S61209466 A JPS61209466 A JP S61209466A
- Authority
- JP
- Japan
- Prior art keywords
- developing device
- toner
- developer
- developing
- sleeve
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0105—Details of unit
- G03G15/0126—Details of unit using a solid developer
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、カラー電子写真複写装置及びコンピュータ出
力部のカラー記録装置等の電子写真装置に関するもので
あり、特に複数個の現像器を像担持体周面に配置した前
記の如き電子写真装置に関するものである。以下の説明
においては、複写装置に関連して説明するが本発明はこ
れに限定されるものではない。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic apparatus such as a color electrophotographic copying apparatus and a color recording apparatus of a computer output section, and particularly relates to an electrophotographic apparatus such as a color electrophotographic copying apparatus and a color recording apparatus of a computer output section, and more particularly to the above-mentioned electrophotographic apparatus in which a plurality of developing units are arranged on the circumferential surface of an image carrier. This invention relates to an electrophotographic apparatus such as the above. Although the following description will be made in connection with a copying apparatus, the present invention is not limited thereto.
良遼JL艮藷
最近、特殊分野に限らず一般事務の分野においてもカラ
ー複写の需要が急速に増大し1画像の品質の向上が希求
されている。Recently, the demand for color copying has increased rapidly not only in special fields but also in general office fields, and there is a desire to improve the quality of each image.
斯る要望に応えるために解決すべき重要な問題の一つは
、フルカラー及びマルチカラー複写装置において、像担
持体上に形成された各色静電潜像を顕像化する現像装置
を如何に構成するかにある。One of the important problems to be solved in order to meet such demands is how to configure the developing device that visualizes the electrostatic latent images of each color formed on the image carrier in full-color and multi-color copying machines. There's something to be said for it.
現在最も多く利用されているカラー電子写真複写装置は
、像担持体表面に沿って各色の現像剤を有した複数個の
現像器を配列した並置式多色現像装置を採用している。The most commonly used color electrophotographic copying apparatus at present employs a side-by-side multicolor developing device in which a plurality of developing devices each having a developer of each color are arranged along the surface of an image carrier.
が よ − 、 へ上記のよう
に複数個の現像器を設置するにあたっては、一つの現像
器中のトナーが飛散したり、或は像担持体、即ち感光体
上に一旦付着した(現像された)トナーが別の現像器に
磁力等により引鼻寄せられて混色することが問題である
。However, when installing multiple developing devices as described above, the toner in one developing device may scatter or once adhere to the image carrier, i.e., the photoreceptor (developed toner). ) The problem is that the toner is attracted to another developing device by magnetic force or the like, causing color mixing.
トナーは、一般に磁力及び静電気力により現像器のスリ
ーブ上又は像担持体面上に拘束されるので七の拘束力の
弱いものほど飛散等によって混色され易くなる0例えば
、磁性1成分現像剤を用いた現像方法(特開昭54−4
2141号等)では、トナーへの電荷性ケは現像器のス
リーブとの接触摩擦により行われるため電荷量が低い(
4〜8 p−c/ g)。このようなトナーが現像され
、その像担持体上のトナー像が別の現像器上を通過せし
められると、該別の現像器の現像スリーブが内蔵するマ
グネットの磁気引力が強い場合には、トナー像は電荷量
が低く従って像担持体への静電的付着力が弱いために、
該別の現像器のマグネットの磁気引力によってトナー像
の一部が像担持体から剥離し、別の現像器に回収される
。即ち、混色現象を生ずる。この現象は、上記別の現像
器が従来の2成分現像法、つまり磁気ブラシ現像法を採
用している場合を考えれば容易に理解されるであろう。Generally, toner is restrained on the sleeve of a developing device or on the surface of an image carrier by magnetic force and electrostatic force, so the weaker the restraining force, the more likely the colors will be mixed due to scattering, etc.0 For example, when a magnetic one-component developer is used Development method (Unexamined Japanese Patent Publication No. 54-4
No. 2141, etc.), the charge to the toner is generated by contact friction with the sleeve of the developing device, so the amount of charge is low (
4-8 p-c/g). When such toner is developed and the toner image on the image carrier is passed over another developing device, if the magnetic attraction of the magnet built in the developing sleeve of the other developing device is strong, the toner image will be Since the image has a low charge and therefore weak electrostatic adhesion to the image carrier,
A part of the toner image is peeled off from the image carrier by the magnetic attraction of the magnet of the other developing device and collected in another developing device. That is, a color mixture phenomenon occurs. This phenomenon will be easily understood if one considers that the other developing device employs the conventional two-component development method, that is, the magnetic brush development method.
又、全ての現像器に従来の2成分現像法を用いたとして
も、トナーの荷電量が低ければ、トナーのスリーブ又は
像担持体への拘束力は弱くなり。Further, even if the conventional two-component development method is used in all developing devices, if the amount of charge of the toner is low, the binding force of the toner to the sleeve or image carrier will be weak.
飛散が多くなり、それら飛散トナーの多くは重力又は像
担持体の移動に伴なう該担持体上の空気流により下流側
の現像器に回収されるか、或いは機内の至る所に付着す
る所謂機内飛散を生ずる等の問題を引き起こしていた。Most of the scattered toner is collected by the downstream developing device due to gravity or the air flow over the image carrier as the image carrier moves, or it is so-called in-machine scattering that adheres everywhere inside the machine. This was causing problems such as.
これらの問題を軽減するために作動中の現像器以外の現
像器を像担持体や作動中のものから機械的に離間させた
り、非作動中の現像器のスリーブにシャッターを設ける
ことも考えられるが、これらの手段はいずれも装置を複
雑で、高価で且つ大型化させる難があり、問題であった
。In order to alleviate these problems, it may be possible to mechanically separate developing devices other than those in operation from the image carrier or other devices in operation, or to provide shutters on the sleeves of developing devices that are not in operation. However, all of these methods have the problem of making the device complicated, expensive, and large-sized.
l見立11
従って1本発明の目的は、特別の装置を必要とすること
なく複数個の現像器を常時安定して作動させることがで
き、しかも上述したようなトナーの飛散とそれに伴う混
色等を防止することを可能とした電子写真装置を提供す
ることである。11 Therefore, an object of the present invention is to be able to operate a plurality of developing units stably at all times without the need for any special equipment, and to avoid the above-mentioned toner scattering and resulting color mixing. An object of the present invention is to provide an electrophotographic apparatus that can prevent the above problems.
。 占 だ の
上記の目的は、像担持体上に形成された静電潜像を該担
持体周面に配置された複数個の現像器のいずれかにより
現像した後、紙等の転写材に転写する方式より成る電子
写真装置において、該複数個の現像器を配置するにあた
り、荷電量の大きな現像剤を有する現像器から順に像担
持体の回転方向上流側より回転方向下流側へと配置せし
めたことを特徴とする電子写真装置によって達成される
。. The above purpose of the image carrier is to develop the electrostatic latent image formed on the image carrier using one of a plurality of developing devices arranged around the circumferential surface of the carrier, and then transfer it to a transfer material such as paper. In an electrophotographic apparatus having a system of This is achieved by an electrophotographic device characterized by the following.
以下、本発明係る電子写真装置を図面に即して詳述する
。Hereinafter, the electrophotographic apparatus according to the present invention will be described in detail with reference to the drawings.
上述したように1本発明゛の原理は、2色又は3色以上
の多色刷り(マルチカラー)用電子写真装置、さらには
金色(フルカラー)用電子写真装置に適用することがで
きるが、以下の実施例では説明を簡単にするために2個
の現像器を有する電子写真複写装置に関連して説明する
。As described above, the principle of the present invention can be applied to an electrophotographic apparatus for multicolor printing of two or more colors, and furthermore to an electrophotographic apparatus for gold color (full color). The embodiments will be described in connection with an electrophotographic copying apparatus having two developing devices for the sake of simplicity.
第1図には、電子写真複写装置が概略断面図で示される
。像担持体の一つである感光体lは、帯電器2により一
様に帯電され、像露光3を受けて静電潜像を形成し1次
いでこれは現像器4又は5からのトナーにより可視像化
される。この可視像化されたトナー像は転写帯電器6に
より紙等の転写材に転写され1分離帯電器7により静電
的に感光面より剥離され、定着器へと進む、一方、感光
体上の転写残トナー像は、クリーニングブレード等のク
リーニング手yt8により除去される。In FIG. 1, an electrophotographic reproduction apparatus is shown in a schematic cross-sectional view. A photoreceptor 1, which is one of the image carriers, is uniformly charged by a charger 2 and subjected to image exposure 3 to form an electrostatic latent image 1, which is then toned by toner from a developer 4 or 5. Visualized. This visualized toner image is transferred to a transfer material such as paper by a transfer charger 6, electrostatically peeled off from the photosensitive surface by a one-separation charger 7, and advances to a fixing device. The transferred residual toner image is removed by a cleaning hand yt8 such as a cleaning blade.
L記の一連のプロセスを有する装置において、複数個1
本実施例では2個の現像器を有する場合、各々の現像器
に用いられるトナーの色材を変えることにより、多色刷
り又は所望の色による複写(色の選択)が可能となる0
例えば、現像器4を黒、現像器5を赤とした場合、いず
れかの現像器のみに現像バイアスを印加することにより
黒又は赤のみの現像が可能となる(色の選択)、又、第
1回目のプロセスにおいて黒トナーで現像、転写、定着
後に同一の転写材を供与して第2回目のプロセスにおい
て赤トナーで現像すれば多色刷りが可能となる。従って
、上記の例に留らず、3側、4個と現像器を配置するこ
とにより、3色、4色刷り等が可能となる。In an apparatus having a series of processes listed in L, a plurality of 1
In this embodiment, when two developing devices are used, multicolor printing or copying in a desired color (color selection) is possible by changing the coloring material of the toner used in each developing device.
For example, if the developing device 4 is black and the developing device 5 is red, by applying a developing bias to only one of the developing devices, it is possible to develop only black or red (color selection). If the same transfer material is provided after development, transfer, and fixing with black toner in the first process, and development is performed with red toner in the second process, multicolor printing becomes possible. Therefore, by arranging four developing units on three sides, it is possible to perform three-color, four-color printing, etc., without limiting to the above example.
本実施例では、像担持体lの回転方向上流側の現像器4
にはキャリアとトナーとを混在させた2成分現像法をそ
して現像器5には磁性を有するl成分トナーによる現像
法が用いられる。但し、上流側の2成分現像法について
は、従来の磁気(キャリア)ブラシを感光面に当接させ
て現像させるものではなく、キャリアをドクターブレー
ドの前に滞留させ、トナーのみをキャリア間を通過させ
てスリーブ上にトナーの薄層コートを形成させ、これを
感光面と非接触状態に置いてジャンピング現像させる現
像方法(詳細は特願昭58−151028号を参照)、
或はドクターブレードによりキャリアとトナーのブラシ
の高さを規制して感光面と非接触状態とし、バイアス印
加によって現像する方法を用いる。これらの方法により
、現像器4の非作動時において、現像器又はスリーブを
感光面から離間させることなく、そのバイアス制御によ
り不要なトナーの感光面への付着が防止される。In this embodiment, the developing unit 4 on the upstream side in the rotational direction of the image carrier l
A two-component development method using a mixture of carrier and toner is used for the development device 5, and a development method using magnetic l-component toner is used for the development device 5. However, in the upstream two-component development method, instead of developing by bringing a conventional magnetic (carrier) brush into contact with the photosensitive surface, the carrier is retained in front of the doctor blade, and only the toner passes between the carriers. A developing method in which a thin layer of toner is formed on the sleeve, and this is placed in a non-contact state with the photosensitive surface for jumping development (for details, see Japanese Patent Application No. 151028/1983);
Alternatively, a method is used in which the heights of carrier and toner brushes are regulated using a doctor blade so that they are in a non-contact state with the photosensitive surface, and development is performed by applying a bias. By these methods, when the developing device 4 is not in operation, unnecessary toner is prevented from adhering to the photosensitive surface by controlling the bias without separating the developing device or the sleeve from the photosensitive surface.
1、記のような現像器の配置においては、上述したよう
に、上流側と下流側の現像器における両トナーの荷”;
r5.rの間には有意差が生ずる。即ち、1成分法では
、トナーが主にスリーブとの接触摩擦により電荷を付与
されるため平均的な荷電量は小さい(4〜7JLc/g
)、一方、2成分法は、トナーが主にキャリアとの接触
摩擦により電荷を付与されるので、トナーとキャリアの
接触回数1時間が多い分だけ平均荷電量は大きい(10
JLc/g以上)。1. In the arrangement of the developing devices as described above, as mentioned above, both toner loads in the upstream and downstream developing devices are distributed.
r5. There is a significant difference between r. That is, in the one-component method, the toner is charged mainly by contact friction with the sleeve, so the average charge amount is small (4 to 7 JLc/g).
), On the other hand, in the two-component method, the toner is charged mainly by contact friction with the carrier, so the average amount of charge is larger (10
JLc/g or more).
ここで、荷電粒子の被付着体への付着力を第2図を参照
しながら考察する。一般に、荷電粒子の被付着体への接
着力は、被付着体からの静電引力F1.荷電粒子の鏡像
力F2及びファンデルワールス力F3の合力として表わ
され、F=F、+Fl+F3となるが、第3項は第1項
及び第2項と比べて小さく、無視できる。又、第1項は
荷電量σに、そして第2項は荷電量σの2乗に比例する
。つまり、付着力は荷電量が大きいほど大となる。一方
、上流側の現像器4の作動中は、下流側の現像器5は、
そのスリーブ5a上のトナーの感光体1方向への飛翔を
押えるため、はぼ感光面の表面電位VOよりも高い電位
Vを付与するのが常である。特に、現像器5の有するト
ナーの荷電量δ′が小さいため、上式で表わされるスリ
ーブへの付着力F′を上げ飛散を防ぐために第1項の静
電引力を大きくしなければならない、従ってVはVoに
比べてかなり高いバイアス値として設定される。このよ
うな状態においては、スリーブ感光面間には(V−Vo
)/dの電界Eが生ずるため感光面上のトナー像はこ、
の電界により現像器5のスリーブ5a方向への剥離力F
oを生ずる(ここでdは両者間の間隔である)、シかる
に、現像器4により現像されたトナー像の荷電量は現像
器5のそれに比べて大きいため前記付着力Fの第2項で
表わされる鏡像力が十分大となり、F>F。Here, the adhesion force of charged particles to an adherend will be discussed with reference to FIG. 2. Generally, the adhesion force of charged particles to an adherend is caused by electrostatic attraction F1. It is expressed as the resultant force of the mirror image force F2 of the charged particle and the van der Waals force F3, and F=F, +Fl+F3, but the third term is smaller than the first and second terms and can be ignored. Further, the first term is proportional to the charge amount σ, and the second term is proportional to the square of the charge amount σ. In other words, the adhesive force increases as the amount of charge increases. On the other hand, while the upstream developer 4 is in operation, the downstream developer 5 is
In order to prevent the toner on the sleeve 5a from flying toward the photoreceptor 1, a potential V higher than the surface potential VO of the photosensitive surface is usually applied. In particular, since the amount of charge δ' of the toner possessed by the developing device 5 is small, the electrostatic attraction force in the first term must be increased in order to increase the adhesion force F' to the sleeve expressed by the above equation and prevent scattering. V is set as a much higher bias value than Vo. In such a state, there is a gap (V-Vo) between the photosensitive surfaces of the sleeve.
)/d is generated, so the toner image on the photosensitive surface is
The peeling force F in the direction of the sleeve 5a of the developing device 5 due to the electric field of
(here, d is the distance between the two).However, since the amount of charge of the toner image developed by the developing device 4 is larger than that of the developing device 5, the second term of the adhesion force F is The mirror image force expressed by becomes sufficiently large, F>F.
の関係が成立する。即ち、上流側の現像器のトナーの荷
電量を下流側より大とすることにより、下流側の現像器
からの飛散を押えるようなバイアスを印加した場合にお
いても、上流側の現像器によるトナー像の付着力は、下
流側現像器のバイアス印加に伴なう剥離力よりも大とな
り、従って下流側現像器への飛散、混色を防止すること
ができる。The relationship holds true. In other words, by making the amount of charge on the toner in the upstream developing device larger than that in the downstream side, even when a bias is applied to suppress toner scattering from the downstream developing device, the toner image produced by the upstream developing device is The adhesion force is greater than the peeling force associated with bias application to the downstream developing device, and therefore, scattering to the downstream developing device and color mixing can be prevented.
上記の実施例に従った電子写真装置を用いて複写実験を
行なった。感光体の表面電位を最大+400vとし、前
記の2成分法を現像器4に、モしてl成分法を現像器5
に用い、共に負極性トナーを使用した。この場合の現像
器4のトナーの荷電量は−10〜−151Lc / g
であり、現像器5のトナーの荷電量は−3〜−6p−c
/gであったため、現像器5のスリーブにd=3001
Lmとして+600Vのバイアスを印加した。このよう
な条件でA4用紙10.000枚通紙時においても現像
器5への混色は微々たるものであり、現像器5の性情1
芭調を低下させるものではなかった。A copying experiment was conducted using an electrophotographic apparatus according to the above example. The surface potential of the photoreceptor is set to +400V at maximum, and the two-component method described above is applied to the developer 4, and the l-component method is applied to the developer 5.
In both cases, negative polarity toner was used. In this case, the amount of charge of the toner in the developing device 4 is -10 to -151Lc/g.
The amount of charge of the toner in the developing device 5 is -3 to -6 p-c.
/g, so d = 3001 on the sleeve of developing device 5.
A bias of +600V was applied as Lm. Under these conditions, even when 10,000 sheets of A4 paper are passed through, the color mixture in the developing device 5 is slight, and the characteristics of the developing device 5 are as follows.
It did not reduce the level of bass.
次に、本発明に従う電子写真装置の他の実施例について
説明する0本実施例では、第1図に示したように、像担
持体である感光体周面に2個の現像器を配置し、共に磁
性を有する1成分トナーを用い、上流側現像器を黒、下
流側現像器をセピア色とする。前述のように、l成分法
においては。Next, another embodiment of the electrophotographic apparatus according to the present invention will be described. In this embodiment, as shown in FIG. , both use magnetic one-component toner, and the upstream developer is black and the downstream developer is sepia. As mentioned above, in the l-component method.
トナーへの電荷付与は主にスリーブとの接触摩擦により
行なわれるため、その接触面積が大きいほど荷電量は大
きくなる。そこで、本実施例では、第3図に示すように
、トナー剤のスリーブと接触する実質圧fa文について
上流側の現像器4を下流側のそれに比べて大とした。具
体的には、スリーブ径rを同一として、ブレード10と
ステージ下面11の成す角θについて上流側を下流側に
比べてほぼ1.5倍とした。これにより現像器4のトナ
ーの荷電量は現像器5のそれに比べて十分に大となり、
前記の実施例と同様の効果が得られた。Since charge is applied to the toner mainly by contact friction with the sleeve, the larger the contact area, the larger the amount of charge. Therefore, in this embodiment, as shown in FIG. 3, the actual pressure fa of the toner material in contact with the sleeve is made larger in the upstream developing device 4 than in the downstream developing device 4. Specifically, with the sleeve diameter r being the same, the angle θ formed by the blade 10 and the stage lower surface 11 was approximately 1.5 times larger on the upstream side than on the downstream side. As a result, the amount of charge on the toner in the developing device 4 becomes sufficiently large compared to that in the developing device 5.
The same effects as in the previous example were obtained.
又、逆に0を同一とし、スリーブ径rを上流側を大とし
、そして接触距離文を大とした系においても、同様に飛
散、混色は生じなかった。Conversely, in a system in which 0 was the same, the sleeve diameter r was increased on the upstream side, and the contact distance was increased, neither scattering nor color mixing occurred.
更に、本発明に従う電子写真装置の他の実施例について
説明する0本実施例では、既述の実施例と同様に2個の
現像器を用い、そして共に既述の2成分法を用いる。2
成分法においては、一般的にトナーの荷電はキャリアと
の接触摩擦により付ケされる。従って、本実施例では、
再現像器に用いるキャリア剤を別種のものとする。具体
的には、上流側の現像器4のキャリアの比表面積を下流
側のキャリアのそれに比べて大とする0例えば、現像器
4には偏平なもの(日本鉄粉型EFVキャリア)を、そ
して現像器5には球状のもの(日本鉄粉製TSVキャリ
ア)を用いた。これにより偏シなキャリアは球状のそれ
に比べてトナーの取込みが増加し、接触回数や面積が大
きくなり、荷電量がその分だけ大となった。即ち、上流
側のトナーの荷電量が下流側のそれに比べて大となり、
既述の実施例と同様の効果が得られた。Furthermore, in this embodiment, which describes another embodiment of the electrophotographic apparatus according to the present invention, two developing units are used as in the previously described embodiments, and both use the previously described two-component method. 2
In the component method, the toner is generally charged by contact friction with the carrier. Therefore, in this example,
A different type of carrier agent is used in the reproducing device. Specifically, the specific surface area of the carrier in the upstream developer 4 is made larger than that of the downstream carrier. For example, a flat one (Japanese iron powder type EFV carrier) is used in the developer 4, and A spherical developing device (TSV carrier manufactured by Nippon Steel Powder) was used as the developing device 5. As a result, the uneven carrier takes in more toner than the spherical carrier, and the number of contacts and area becomes larger, and the amount of charge becomes correspondingly larger. In other words, the amount of charge on the toner on the upstream side is larger than that on the downstream side,
Effects similar to those of the previously described embodiments were obtained.
又、キャリアの形状を同一とする代りにキャリアの粒径
を上流側で小とする0例えば、上流側のキャリアの粒径
を50〜80ILm、下流側のそれを100〜150p
mとすることができる。キャリアの粒径が小さいものほ
どトナーとの混合がよく、両者の接触回数が、増加し、
その分だけ摩擦帯電量が増大する。従って、上流側のト
ナーの荷電量が下流側のそれに比べて大となり、既述の
実施例と同様に飛散、混色を防止することができた。Alternatively, instead of making the shape of the carrier the same, the particle size of the carrier is made smaller on the upstream side. For example, the particle size of the carrier on the upstream side is 50 to 80 ILm, and that on the downstream side is 100 to 150 ILm.
m. The smaller the particle size of the carrier, the better it mixes with the toner, and the number of times the two come into contact increases.
The amount of triboelectric charge increases accordingly. Therefore, the amount of charge of the toner on the upstream side was larger than that on the downstream side, and it was possible to prevent scattering and color mixing as in the previously described embodiments.
魚」LΩ」E里
以のように、本発明では、複数個の現像器を像担持体周
面に配置するにあたって、現像剤の荷電量を大となるよ
うに制御した現像器から順に画像担持体の回転上流側よ
り配置することによって、下流側の現像器からの飛散を
抑えつつ(そのようなバイアス印加下においても)像担
持体からのトナーの飛散とそれに伴なう下流側現像器へ
の混色・を容易に抑止することができるという効果が得
られる。In the present invention, when a plurality of developing devices are arranged on the circumferential surface of the image carrier, the image carrying device is sequentially arranged starting from the developing device in which the amount of charge of the developer is controlled to be large. By arranging the toner from the upstream side of the rotation of the image carrier, it is possible to prevent toner from scattering from the downstream developing device (even under such bias application) and prevent toner from scattering from the image carrier and the accompanying toner from the downstream developing device. The effect is that color mixing can be easily suppressed.
第1図は、本発明に従った電子写真装置の概略断面図で
ある。
第2図は、荷電粒子の被付着体への付着力を説明する図
である。
第3図は、現像器におけるスリーブとトナー剤との接触
の変化を説明する図である。
l:像担持体
?=帯電器
4.5:現像器
F−Fr + F2 十F3 F、Key−F
2°り・ノ2第3図FIG. 1 is a schematic cross-sectional view of an electrophotographic apparatus according to the present invention. FIG. 2 is a diagram illustrating the adhesion force of charged particles to an object to which they are attached. FIG. 3 is a diagram illustrating changes in contact between the sleeve and toner in the developing device. l: Image carrier? = Charger 4.5: Developer F-Fr + F2 10F3 F, Key-F
2°ri・no2 Figure 3
Claims (1)
配置された複数個の現像器のいずれかにより現像した後
、紙等の転写材に転写する方式より成る電子写真装置に
おいて、該複数個の現像器を配置するにあたり、荷電量
の大きな現像剤を有する現像器から順に像担持体の回転
方向上流側より回転方向下流側へと配置せしめたことを
特徴とする電子写真装置。1) An electrophotographic method in which an electrostatic latent image formed on an image carrier is developed by one of a plurality of developing devices arranged around the carrier, and then transferred to a transfer material such as paper. In the apparatus, the plurality of developing devices are arranged in order from the upstream side in the rotational direction of the image carrier to the downstream side in the rotational direction of the image carrier, starting with the developing device having a developer with a large amount of charge. Photographic equipment.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60049356A JPS61209466A (en) | 1985-03-14 | 1985-03-14 | Electrophotographic device having plural developing devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60049356A JPS61209466A (en) | 1985-03-14 | 1985-03-14 | Electrophotographic device having plural developing devices |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61209466A true JPS61209466A (en) | 1986-09-17 |
Family
ID=12828734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60049356A Pending JPS61209466A (en) | 1985-03-14 | 1985-03-14 | Electrophotographic device having plural developing devices |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61209466A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62153873A (en) * | 1985-12-26 | 1987-07-08 | Sanyo Electric Co Ltd | Multicolored electrostatic recording device |
JPH0192767A (en) * | 1987-10-05 | 1989-04-12 | Fuji Xerox Co Ltd | Color image recording method |
-
1985
- 1985-03-14 JP JP60049356A patent/JPS61209466A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62153873A (en) * | 1985-12-26 | 1987-07-08 | Sanyo Electric Co Ltd | Multicolored electrostatic recording device |
JPH0192767A (en) * | 1987-10-05 | 1989-04-12 | Fuji Xerox Co Ltd | Color image recording method |
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