JPS59174864A - Developing device - Google Patents

Developing device

Info

Publication number
JPS59174864A
JPS59174864A JP5088183A JP5088183A JPS59174864A JP S59174864 A JPS59174864 A JP S59174864A JP 5088183 A JP5088183 A JP 5088183A JP 5088183 A JP5088183 A JP 5088183A JP S59174864 A JPS59174864 A JP S59174864A
Authority
JP
Japan
Prior art keywords
magnetic toner
recording medium
toner
polarity
counter electrode
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
Application number
JP5088183A
Other languages
Japanese (ja)
Inventor
Koichi Tomura
光一 戸村
Kazuhiro Samejima
鮫島 一博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP5088183A priority Critical patent/JPS59174864A/en
Publication of JPS59174864A publication Critical patent/JPS59174864A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/06Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/09Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush

Abstract

PURPOSE:To improve the half-tone reproducibility of an image and to increase a developing device in speed and size easily by providing a magnet roll having the same polarity with magnetic toner and a counter electrode having the polarity opposite to that of the magnetic toner to a device which carries out development while a recording medium does not contact with magnetic toner. CONSTITUTION:A voltage having the same polarity with an electrostatically charged electrode for the magnetic toner is applied from an electric power source 8 to between the sleeve 12 of the magnet roll 1 and doctor blade 2 in the device which performs development while the recording medium does not contact with the magnetic toner, producing a necessary electric field between an electromagnetic latent image and the sleeve 12. Consequently, the magnetic toner sticks to the electrostatic latent image with a low potential. The toner image developed as mentioned above is passed through the correction gap d3 formed between the recording medium 4 and counter electrode 5 applied with a voltage with the polarity opposite to the charged polarity of magnetic toner by a power source 6 to improve the half-tone reproducibility of the toner image and a picture. Further, the device is increased in speed and size without high-precision work nor adjustment.

Description

【発明の詳細な説明】 この発明は、記録媒体上に形成された静電潜像を磁性ト
ナーで顕像化する磁気ブラシ現像方式による現像装置に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device using a magnetic brush developing method that visualizes an electrostatic latent image formed on a recording medium using magnetic toner.

従来、この種の装置として第1図に示すものがあった。Conventionally, there has been a device of this type as shown in FIG.

図において、Q】)は円柱状磁石で、これはこの表面に
複数の着磁極をもったものであり、a邊はこの円柱状磁
石αηを内包する円筒状の導電性・非磁性材で形成され
たスリーブであり、この両者で磁石ロール(1)を構成
する。(2)は導電性・非磁性材料で形成されたドクタ
ー・ブレード、、(3)は現像剤容器、(4)は静電潜
像を保持できる記録婦体で、61)は光導電体層、(6
)は導電性基板である。
In the figure, Q]) is a cylindrical magnet that has multiple magnetized poles on its surface, and the a side is made of a cylindrical conductive/nonmagnetic material that encloses the cylindrical magnet αη. These two sleeves constitute a magnet roll (1). (2) is a doctor blade made of conductive and non-magnetic material, (3) is a developer container, (4) is a recording body capable of holding an electrostatic latent image, and 61) is a photoconductor layer. , (6
) is a conductive substrate.

以上の構成において、スリーブu巧とドクター・ブレー
ド(2)との間隙をドクターギャップdIN記録媒体(
4)とスリーブ04との間隙を現像ギャップd2とする
。また、円柱状磁石αυは第1図の如くに着磁され、図
示した状態で固定されており、スリーブ@だけが図中矢
印Aの方向に、記録媒体(4)と等速に移動する。記録
媒体(4)の移動方向は図中矢印Bで示した方向である
In the above configuration, the gap between the sleeve U and the doctor blade (2) is replaced by the doctor gap dIN recording medium (
4) and the sleeve 04 is defined as a developing gap d2. Further, the cylindrical magnet αυ is magnetized as shown in FIG. 1 and fixed in the state shown, and only the sleeve @ moves in the direction of arrow A in the figure at the same speed as the recording medium (4). The moving direction of the recording medium (4) is the direction shown by arrow B in the figure.

次に動作について説明する。スリーブ(2)が図中矢印
Aの方向に回転することにより、高抵抗又は絶縁性の磁
性トナー(現像剤)は現像剤容器(3)から引き出され
、ドクター・ブレード(2)で規制された量だけがスリ
ーブ0才上に供給される。このときドクターギャップd
1は、Q、4朋以下になるとスリーブ(2)上への均一
で安定した磁性トナーの供給がむつかしくなり、逆に、
INM以上になると磁性トナーの均一な帯電が行なわれ
なくなる等の欠点があり、一般には0.5間程度に選ば
れる。ドクターギャップdlからスリーブ0才上に適量
供給された磁性トナーは、現像領域(現像ギャップd2
設定点)に達するまでに帯電される。現像領域では、現
像ギャップd2は、d1≦d2<”dtに設定され、磁
性トナーは常に記録媒体(4)と接し、磁性トナーの帯
電極性と反対極性の静電潜像に付着し、可視像化する。
Next, the operation will be explained. By rotating the sleeve (2) in the direction of arrow A in the figure, high-resistance or insulating magnetic toner (developer) is drawn out from the developer container (3) and regulated by the doctor blade (2). Only the amount supplied above the sleeve is 0. At this time, doctor gap d
1 is Q, if it is less than 4, it becomes difficult to supply uniform and stable magnetic toner onto the sleeve (2), and conversely,
If it exceeds INM, there will be a drawback that the magnetic toner will not be charged uniformly, so it is generally selected to be about 0.5. An appropriate amount of magnetic toner is supplied from the doctor gap dl to the upper part of the sleeve.
set point). In the development area, the development gap d2 is set to d1≦d2<”dt, and the magnetic toner is always in contact with the recording medium (4), adheres to an electrostatic latent image with a polarity opposite to that of the magnetic toner, and is visible. Visualize.

従来の現像装置は以上のように構成されているので、高
抵抗又は絶縁性の磁性トナーで記録媒体(4)上の静電
潜像をきれいに再現することが困難であり、静電潜像の
まわりに余分の磁性トナーが付着したり、地力ブリが多
かったり、飛散する磁性トナーが多かったりする等の欠
点があった。
Since the conventional developing device is configured as described above, it is difficult to clearly reproduce the electrostatic latent image on the recording medium (4) using high-resistance or insulating magnetic toner, and the electrostatic latent image is There were disadvantages such as excess magnetic toner adhering to the surrounding area, a lot of ground force blurring, and a lot of magnetic toner scattering.

この発明は以上のような従来のものの欠点を除失するた
めになされたもので、記録媒体と磁性トナーとが非接触
状態で現像される埃、像装置において、上記記録媒体に
対向して磁性トナーの帯電極性と逆極性の電圧を印加し
た対向電極を設け、これにより上記記録媒体上の余分な
磁性トナーが回収できるよ・うにし、さらには上記記録
媒体上に磁性トナーを付着せしめる磁石ロールに上記磁
性トナーの帯N極性と同極性の電圧を印加することによ
り、高精度の加工、調整をすることなく大型化や高速化
に対処でき、しかも高品質の、特に中間調再現性の良好
な画像形成が可能となる現像装置を提供することを目的
としている。
This invention was made to eliminate the drawbacks of the conventional ones as described above. A magnetic roll is provided with a counter electrode to which a voltage having a polarity opposite to the charged polarity of the toner is applied, thereby making it possible to collect excess magnetic toner on the recording medium, and further adhering the magnetic toner onto the recording medium. By applying a voltage with the same polarity as the N polarity of the magnetic toner, it is possible to handle larger sizes and higher speeds without high-precision machining or adjustment, and to achieve high quality, especially good halftone reproducibility. It is an object of the present invention to provide a developing device that is capable of forming images.

以下この考案の一実施例を図について説明する。An embodiment of this invention will be described below with reference to the drawings.

第2図において、(1)は磁石ロールであり、これは複
数の磁極をその表面にもつ円柱状磁石0υと、この円柱
状磁石01)を内包する導電性・非磁性の材料で形成さ
れたスリーブつ=で構成されている。(2)はドクター
・ブレード、(3)は現像剤容器、(4)は記録媒体で
あり、これは静電潜像を形成できる光導電体θ〃と導電
性基板(/42とで構成されている。(5)は導電性・
非磁性材からなる円柱又は円筒状に形成された回転可能
な対向電極、(6)はこの対向電極(5)に磁性トナー
の帯電極性と反対極性の電位を与えることができる対向
電極用電源、(7)はスクレーバーであり、これは絶縁
性の物質で形成するが、又はこのスクレーパー(7)を
通じて電源電圧が他部材へリークすることがないように
処置して設けられている。また、(8)は磁石ロール(
1)のスリーブα2上及びドクター・ブレード(2)上
に磁性トナーの帯電極性と同じ極性の電圧を印加するた
めの磁石ロール用電源である。
In Figure 2, (1) is a magnet roll, which is made of a conductive, non-magnetic material that contains a cylindrical magnet 0υ with multiple magnetic poles on its surface and this cylindrical magnet 01). It consists of two sleeves. (2) is a doctor blade, (3) is a developer container, and (4) is a recording medium, which is composed of a photoconductor θ〃 capable of forming an electrostatic latent image and a conductive substrate (/42). (5) is conductive.
(6) a rotatable counter electrode formed in a columnar or cylindrical shape made of a non-magnetic material; (6) a power source for the counter electrode capable of providing the counter electrode (5) with a potential having a polarity opposite to the charged polarity of the magnetic toner; A scraper (7) is made of an insulating material, or is provided to prevent the power supply voltage from leaking to other members through the scraper (7). In addition, (8) is a magnet roll (
This is a power supply for the magnet roll for applying a voltage having the same polarity as the charging polarity of the magnetic toner onto the sleeve α2 and the doctor blade (2) of 1).

以上の構成において、ドクター・ブレード(2)とスリ
ーブaつとの間隙をドクターギャップdI+記録媒体(
4)とスリーブ(2)との間隙を現像ギャップd2゜対
向電極(5)と記録媒体(4)との間隙を修正ギャップ
d3+対向電極(5)とスリーブ@との間隙を回収ギャ
ップd4とする。また、スリーブ(2)、記録媒体(4
)。
In the above configuration, the gap between the doctor blade (2) and the sleeve a is the doctor gap dI + the recording medium (
4) and the sleeve (2) as the development gap d2, the gap between the counter electrode (5) and the recording medium (4) as the correction gap d3+the gap between the counter electrode (5) and the sleeve @ as the recovery gap d4 . In addition, sleeve (2), recording medium (4)
).

対向電極(5)は、それぞれ図中矢印A、矢印B、矢印
Cで示す方向に回転する。さらにスリーブαの。
The counter electrode (5) rotates in the directions indicated by arrows A, B, and C in the figure, respectively. Furthermore, sleeve α.

導電性基板(6)    −・  −は共に接地しであ
る。
The conductive substrates (6) - and - are both grounded.

なお、上記記録媒体(4)とスリーブミノ上の磁性トナ
ーとは非接触状態で現像される。
Note that the recording medium (4) and the magnetic toner on the sleeve are developed in a non-contact state.

次に動作について説明する。Next, the operation will be explained.

記録媒体(4)上の静電潜像は、第1図で示した従来の
もの′と同様に顕像化されるが、第1図では、現像ギャ
ップd2の部分で、記録媒体(4)はスリーブα2上の
磁性トナーと接して現像しているのに対して、本実施例
では、非接触状態で現像される。このような非接触状態
で現像される場合、スリーブミニ上の磁性トナーと記録
媒体(4)とのギャップd2が広くなると、高電位の静
電潜像にだけしが磁性トナーが付着しない傾向を示す。
The electrostatic latent image on the recording medium (4) is visualized in the same manner as in the conventional image shown in FIG. 1, but in FIG. is developed in contact with the magnetic toner on the sleeve α2, whereas in this embodiment, development is performed in a non-contact state. When developing in such a non-contact state, if the gap d2 between the magnetic toner on the sleeve mini and the recording medium (4) widens, the magnetic toner tends not to adhere to the high-potential electrostatic latent image. show.

このことがら、このギャップd2はSQμm〜200μ
mが望ましい。又、一旦磁性トナーの飛翔が始まると、
急激に飛翔トナー量が増加し、潜像電位に対する磁性ト
ナーの付着坦を示すγ特性が′立っ′傾向になる。しが
るに、一旦形成されたトナー像がトナー帯電極性と逆の
極性電位を印加した対向電極(5)の近接点、即ち修正
ギャップd3を通過することにより、磁性トナーを記録
媒体(4)から引き離す方向の電界が加わり、この電界
で余分の磁性トナーが回収される。
For this reason, this gap d2 is SQμm~200μm
m is desirable. Also, once the magnetic toner starts flying,
The amount of flying toner increases rapidly, and the γ characteristic, which indicates the flatness of the adhesion of magnetic toner to the latent image potential, tends to rise. In other words, once the toner image is formed, the magnetic toner is transferred to the recording medium (4) by passing through the correction gap d3, which is a point close to the counter electrode (5) to which a potential with a polarity opposite to the toner charging polarity is applied. An electric field is applied in the direction of separating the magnetic toner from the toner, and the excess magnetic toner is collected by this electric field.

この結果、修正ギャップ63部を通過したトナー像は階
調性の優れた(すなわちγ特性の′ねた′)トナー像を
形成する。対向型! (5)上に回収された磁性トナー
は、対向電極(5)が矢印Cの方向に回転することによ
り、回収ギャップd4付近に設けられたスクレーバー(
7)によって対向電極(5)からシj#された後、磁石
ロール(1)に回収され、再び現像に寄与する。なお、
対向電極(5)の移動速度は記録媒体(4)の移動速度
と等しいか又はそれ以上が望ましい。
As a result, the toner image that has passed through the correction gap 63 forms a toner image with excellent gradation (that is, ``gray'' with γ characteristics). Facing type! (5) By rotating the counter electrode (5) in the direction of arrow C, the magnetic toner collected above is removed from the scraper (
After being removed from the counter electrode (5) by 7), it is collected by the magnet roll (1) and contributes to development again. In addition,
The moving speed of the counter electrode (5) is preferably equal to or higher than the moving speed of the recording medium (4).

ここで、上記現像時、スリーブ0り表面からa性トナー
が飛翔を開始する電圧以下の静電潜像には磁性トナーの
付着が起こらない。このことは記録媒体(4)上の静電
潜像を有効に利用していないばかりか、中間調再州に対
しても不充分なることを示している。このことから、磁
石ロール(1)のスリーブ(功上及びドクター・ブレー
ド(2)上に磁性トナーの帯電極性と同じ極性の電圧を
電源(8)により印加することにより、静電潜像とスリ
ーブ(2)間に、トナー飛翔に必要な電界が加わること
になり、低電位の静電潜像への磁性トナー付着が可能に
なる。
Here, during the above-mentioned development, magnetic toner does not adhere to the electrostatic latent image at a voltage lower than the voltage at which the a-type toner starts flying from the surface of the sleeve. This shows that not only is the electrostatic latent image on the recording medium (4) not effectively utilized, but also that it is insufficient for restoring halftones. From this, by applying a voltage with the same polarity as the charged polarity of the magnetic toner to the sleeve (on top of the magnet roll 1) and the doctor blade (2) using the power supply (8), the electrostatic latent image and the sleeve can be separated. During (2), an electric field necessary for toner flight is applied, making it possible for magnetic toner to adhere to a low-potential electrostatic latent image.

この場合にも、磁性トナーの飛翔開始後は、飛翔トナー
量が急激に増加するために、γ特性が′立つ′仰向にな
る。しかるに、このようにして顕像化したトヂー像を、
磁性トナーの帯電適性と逆極性の電圧を印加した対向電
極と記録媒体の作る修正ギャップを通過させることによ
り、中間調再現性にすぐれたトナー像を形成することか
できる。
In this case as well, after the magnetic toner starts flying, the amount of flying toner increases rapidly, resulting in a supine position in which the γ characteristic stands. However, the Toji image visualized in this way,
A toner image with excellent halftone reproducibility can be formed by passing the magnetic toner through a correction gap created by a recording medium and a counter electrode to which a voltage of polarity opposite to the chargeability of the magnetic toner is applied.

なお、上記実施例では回動する対向電極として、導電性
円柱又は円筒を用いることを示したが、これはベルトで
構成しても良いことは明らかである。
In the above embodiments, a conductive cylinder or a cylinder is used as the rotating counter electrode, but it is clear that a belt may be used as the rotating counter electrode.

又、この対向電極の回転方向を修正領域でυ録媒体及び
磁石ロールの回転方向と反対にとったが、これら)同方
向にとっても良い。しかし、この場合は、スクレーバー
(7)の設置位置は第3図のようにすることが必要にな
る。すなわち、第2図の実施例とは回転方向が反対にな
るため、スクレーバー(7)を上にもってくること、及
び 離した磁性トナーが磁石ロール(1)に回収されや
すいようにすると共に磁石ロール(1)上の現像剤であ
る磁性トナーの走行に悪影物を与えないようにすること
である。
Further, although the direction of rotation of this counter electrode was set to be opposite to the direction of rotation of the υ recording medium and the magnet roll in the correction area, they may be set in the same direction. However, in this case, it is necessary to install the scraper (7) in a position as shown in FIG. That is, since the rotation direction is opposite to that of the embodiment shown in FIG. (1) Preventing the running of the magnetic toner, which is the upper developer, from causing any negative shadows.

また、磁石ロールのスリーブ上に印加する′電圧波形は
、直流に限らず、ACやパルス波、三角波、鋸歯状波等
の周期的な電圧でもよく、さらには直流と周期的な電圧
との組合わせ波形であっても良い。このような周期性の
印加電圧は、回収のための磁性トナーが飛翔開始時にゆ
さぶりを与えられるようなもので、本当に余分となった
磁性トナーだけが飛翔を起し、静電潜像とクーロン力に
よって結合したトナーの飛翔を抑える効果をもつ。この
ために中間調再現がさらに良くなる効果をもつ。
Furthermore, the voltage waveform applied to the sleeve of the magnet roll is not limited to direct current, but may also be AC, pulse wave, triangular wave, sawtooth wave, or other periodic voltage, or even a combination of direct current and periodic voltage. It may be a combined waveform. Such periodic applied voltage is such that the magnetic toner to be collected is shaken when it starts flying, and only the really surplus magnetic toner starts flying, and the electrostatic latent image and Coulomb force are This has the effect of suppressing the flying of the bound toner. This has the effect of further improving halftone reproduction.

又、磁石ロールの回転方式として、円柱磁石固定・スリ
ーブ回転方式で述べてきたが、この回転方式はこれにと
どまらず、円柱磁石回転・スリーブ固定方式、又は両方
回転方式のいずれについても良好なトナーの搬送と顕像
化が可能である。
In addition, as the rotation method of the magnet roll, the cylindrical magnet fixed/sleeve rotation method has been described, but this rotation method is not limited to this, and good toner can be obtained with either the cylindrical magnet rotation/sleeve fixed method, or both rotation methods. can be transported and visualized.

又、ドクター・ブレード(2)は非磁性導電性金稙で形
成した場合について述べたが、これは磁性の導電性金属
で形成してもさしつかえないことは明らかである。
Further, although the case where the doctor blade (2) is made of non-magnetic conductive metal has been described, it is clear that it may be made of magnetic conductive metal.

以上のように、この発明によれば、記録媒体と磁性トナ
ーとが非接触状態で現像される現像装置中に、磁性トナ
ーの帯電極性と逆極性の電圧を印加した対向電極を設け
、さらには、磁石ロールのスリーブ上に磁性トナーの帯
電極性と同一の極性の電圧を印加するようにしたので、
高品質な、特に中間調再現性の良好な画像か安定に形成
でき、高速、大型化に対処しやすい現像装置の構成が可
能となる効果がある。
As described above, according to the present invention, a developing device in which a recording medium and magnetic toner are developed in a non-contact state is provided with a counter electrode to which a voltage having a polarity opposite to the charge polarity of the magnetic toner is applied; , a voltage with the same polarity as the charging polarity of the magnetic toner was applied to the sleeve of the magnet roll, so
It is possible to stably form high-quality images, especially images with good halftone reproducibility, and it is possible to construct a developing device that can easily cope with high speed and large size.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来の現像装置を示す断面側面図、第2図はこ
の発明の一実施例による現像装置を示す断面側面図、第
3図はこの発明の他の実施例による現像装置を示す断面
側面図である。 (1)・・・磁石ロール、(4)・・・記録媒体、(5
)・・・対向電極、(6)・・・対向電極用電源、(8
)・・磁石ロール用電源。 なお図中L=l−符号は同一、又は相当部分を示す。 代理人   葛  野  信  − 第1図 第2図 第3図 手続補正書(自発) 特許庁長官殿 1、事件の表示   特願昭 58−50881号2゜
発明の名称 現像装置 3、補正をする者 代表者片山仁へ部 明細書の発明の詳細な説明の欄 6、補正の内容 (1)明細書第9頁第1O行の1回収」を「現像]に訂
正する。 (2)  同第9頁第12行の[余分となった磁性トナ
ーjを「必要となった磁性トナー量」に訂正する。 (3)同第9頁第13〜14行の「静電潜像・・・・・
・トナー」を「余分のトナー」に訂正する。 以   上
FIG. 1 is a cross-sectional side view showing a conventional developing device, FIG. 2 is a cross-sectional side view showing a developing device according to an embodiment of the present invention, and FIG. 3 is a cross-sectional side view showing a developing device according to another embodiment of the present invention. FIG. (1)... Magnet roll, (4)... Recording medium, (5
)...Counter electrode, (6)...Power source for counter electrode, (8
)... Power supply for the magnet roll. Note that the L=l- symbol in the figure indicates the same or equivalent portion. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 3 Procedure amendment (voluntary) Commissioner of the Japan Patent Office 1. Indication of the case: Japanese Patent Application No. 58-50881 2. Name of the invention Developing device 3. Person making the amendment To representative Hitoshi Katayama, in Column 6 of the detailed explanation of the invention in the specification, contents of the amendment (1) 1 recovery on page 9, line 1O of the specification is corrected to ``Development''. (2) Same No. 9 In the 12th line of the page, [Excess magnetic toner j is corrected to "Required amount of magnetic toner." (3) “Electrostatic latent image...” on page 9, lines 13-14.
・Correct "toner" to "extra toner". that's all

Claims (2)

【特許請求の範囲】[Claims] (1)表面上に静電潜像を保持した記録媒体と、上記記
録媒体と対向して設けられ磁性トナーを上記静電潜像に
非接触状態で付着せしめる磁石ロールと、この磁石p−
ルに上記磁性トナーの帯電極性と同一極性の電圧を印加
する磁石ロール用電源と、上記記録媒体の移動方向に見
て上記磁石ロールより下流側に上記記録媒体と対向して
設けられ上記記録媒体上の余分な磁性トナーを回収する
ための対向電極と、この対向電極に上記磁性トナーの帯
電極性と反対極性の電圧を印加する対向電極用電源とを
備えたことを特徴とする現像装置。
(1) A recording medium holding an electrostatic latent image on its surface, a magnet roll provided facing the recording medium and allowing magnetic toner to adhere to the electrostatic latent image in a non-contact manner, and this magnet p-
a power source for a magnet roll that applies a voltage having the same polarity as the charged polarity of the magnetic toner to the magnetic toner; A developing device comprising: a counter electrode for collecting excess magnetic toner on the magnetic toner; and a counter electrode power source for applying a voltage having a polarity opposite to the charging polarity of the magnetic toner to the counter electrode.
(2)上記磁石ロール用電源の印加電圧を、周期的な電
圧としたことを特徴とする特許請求の範囲第1項記載の
現像装置。
(2) The developing device according to claim 1, wherein the voltage applied by the magnet roll power source is a periodic voltage.
JP5088183A 1983-03-24 1983-03-24 Developing device Pending JPS59174864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5088183A JPS59174864A (en) 1983-03-24 1983-03-24 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5088183A JPS59174864A (en) 1983-03-24 1983-03-24 Developing device

Publications (1)

Publication Number Publication Date
JPS59174864A true JPS59174864A (en) 1984-10-03

Family

ID=12871063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5088183A Pending JPS59174864A (en) 1983-03-24 1983-03-24 Developing device

Country Status (1)

Country Link
JP (1) JPS59174864A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007002146A1 (en) * 2007-01-15 2008-07-24 OCé PRINTING SYSTEMS GMBH Color printing device for electrographic printing- or copying device, has developing stations arranged one after other along charge image carrier and transporting toner of same color at carrier for developing individual charge images

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545730A (en) * 1977-06-15 1979-01-17 Ricoh Co Ltd Developing method of electrostatic latent image
JPS54149647A (en) * 1978-05-16 1979-11-24 Ricoh Co Ltd Developing device using single component toner
JPS55105267A (en) * 1979-02-06 1980-08-12 Canon Inc Method and device for developing
JPS5816269A (en) * 1981-07-22 1983-01-29 Fuji Xerox Co Ltd Developing device of electronic copying machine
JPS5821771A (en) * 1981-08-01 1983-02-08 Konishiroku Photo Ind Co Ltd Developing device for electrostatic latent image

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545730A (en) * 1977-06-15 1979-01-17 Ricoh Co Ltd Developing method of electrostatic latent image
JPS54149647A (en) * 1978-05-16 1979-11-24 Ricoh Co Ltd Developing device using single component toner
JPS55105267A (en) * 1979-02-06 1980-08-12 Canon Inc Method and device for developing
JPS5816269A (en) * 1981-07-22 1983-01-29 Fuji Xerox Co Ltd Developing device of electronic copying machine
JPS5821771A (en) * 1981-08-01 1983-02-08 Konishiroku Photo Ind Co Ltd Developing device for electrostatic latent image

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007002146A1 (en) * 2007-01-15 2008-07-24 OCé PRINTING SYSTEMS GMBH Color printing device for electrographic printing- or copying device, has developing stations arranged one after other along charge image carrier and transporting toner of same color at carrier for developing individual charge images
DE102007002146B4 (en) * 2007-01-15 2008-11-27 OCé PRINTING SYSTEMS GMBH A method of increasing the printing speed of a color electrographic printing device when used for single-color printing

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