JPH10282785A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH10282785A JPH10282785A JP10398597A JP10398597A JPH10282785A JP H10282785 A JPH10282785 A JP H10282785A JP 10398597 A JP10398597 A JP 10398597A JP 10398597 A JP10398597 A JP 10398597A JP H10282785 A JPH10282785 A JP H10282785A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- toner
- carrier
- partition member
- 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.)
- Pending
Links
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、電子写真複写機、
プリンター、ファックス等における静電潜像を一成分現
像剤により可視像とする一成分現像装置に関し、さらに
詳しくは、現像剤担持体上に適正量の現像剤の薄層を素
早く形成することができる現像装置に関する。The present invention relates to an electrophotographic copying machine,
For a one-component developing device that converts an electrostatic latent image into a visible image with a one-component developer in a printer, a facsimile, etc., more specifically, it is required to quickly form a thin layer of an appropriate amount of developer on a developer carrier. The present invention relates to a developing device that can be used.
【0002】[0002]
【従来の技術】潜像担持体に静電潜像を形成し、これを
現像剤によって可視像化して記録画像を得る電子複写
機、プリンター或いはファクシミリ等の画像形成装置で
は、粉体状の現像剤を用いる乾式の現像装置が広く採用
されている。かかる粉体状の現像剤としては、トナーと
キャリアを有する二成分系現像剤と、キャリアを含まな
い一成分系現像剤とが公知であり、前者の二成分系現像
剤を用いた二成分系現像方式は、比較的安定した良好な
記録画像が得られる反面、キャリアの劣化やトナーとキ
ャリアの混合比の変動が発生しやすく、装置の維持管理
が煩雑で、装置全体が大型化しやすくなる欠点を有して
いる。2. Description of the Related Art In an image forming apparatus such as an electronic copying machine, a printer, or a facsimile, which forms a latent image on a latent image carrier and visualizes the latent image with a developer to obtain a recorded image, a powdery image is formed. Dry developing devices using a developer are widely used. As such a powdery developer, a two-component developer having a toner and a carrier and a one-component developer without a carrier are known, and a two-component developer using the former two-component developer is known. The development method has the disadvantage that, although a relatively stable and good recorded image can be obtained, the deterioration of the carrier and the fluctuation of the mixing ratio of the toner and the carrier are liable to occur, the maintenance of the apparatus is complicated, and the entire apparatus is liable to be enlarged. have.
【0003】このような観点から、上述の欠点を有しな
い一成分系現像剤を用いた一成分現像方式が注目されて
いる。一成分系現像剤は、トナーのみからなるものと、
これに必要に応じて補助剤を外添したトナーと補助剤を
混合したものとがある。またトナーとしては、その各ト
ナー粒子自体に磁性粉を練り込んだ磁性トナーと磁性体
を含まない非磁性トナーとがある。ここで、磁性体は一
般的に不透明であるため、フルカラーやマルチカラーを
含めたカラー画像を磁性トナーによって形成すると、現
像された可視像が不鮮明となり、鮮やかなカラー画像を
得ることはできない。したがって、特にカラー現像に対
しては、非磁性トナーを用いた一成分現像方式を用いる
ことが望ましい。[0003] From such a viewpoint, a one-component developing system using a one-component developer which does not have the above-mentioned disadvantages has attracted attention. One-component developer is composed of only toner,
There are toners to which an auxiliary agent is externally added and a mixture of the auxiliary agent as needed. As the toner, there are a magnetic toner in which a magnetic powder is kneaded into each toner particle itself and a non-magnetic toner containing no magnetic material. Here, since the magnetic material is generally opaque, if a color image including full-color or multi-color is formed with magnetic toner, the developed visible image becomes unclear and a vivid color image cannot be obtained. Therefore, particularly for color development, it is desirable to use a one-component development method using a non-magnetic toner.
【0004】ところで現像剤担持体表面は、トナーとの
摩擦帯電により電荷が発生するが、それが速やかに消失
しないと、次回転目の摩擦帯電、現像に影響を及ぼし、
摩擦帯電の立ち上がり性や残像等の原因となる。そこで
担持体材料の電気特性、特にその体積抵抗を電荷が速や
かに消失しやすい1013Ω・cm以下に制御することが
一般的である。(例えば、特開昭276174、特開平
2−208671、特開平3−68974等)[0004] By the way, the surface of the developer carrying member generates electric charge due to frictional charging with the toner, but if it does not disappear quickly, it will affect the frictional charging and development of the next rotation,
It causes rise of triboelectric charging and afterimages. Therefore, it is general to control the electrical characteristics of the carrier material, particularly its volume resistance, to 10 13 Ω · cm or less, at which charge is easily lost. (For example, JP-A-276174, JP-A-2-208671, JP-A-3-68974, etc.)
【0005】担持体材料の電気特性を制御する方法とし
ては、絶縁性樹脂に導電性粒子を添加する方法(例え
ば、種々の導電性粒子を挙げた例として、特開平1−1
01375、特開平2−105181、特開平2−10
9071、特開平2−109072、特開平2−109
075、特開平3−284769、特開平3−2009
86等、導電性粒子の形状を挙げた例として、特開平1
−152480、特開平2−33166、特開平2−8
9075、特開平3−95574等)があるが、場所に
よる抵抗のバラツキ、抵抗の再現性等に問題がある。上
記問題を解決する方法として、アルコール可溶ナイロン
を抵抗制御剤として用いることが提案されている(例え
ば特開昭64−66674、特開昭64−66676、
特開平2−50187等)。しかし、ナイロンは吸湿性
が大きいため、環境による抵抗の変動が3オーダー以上
もあり、それにより現像特性が変化してしまうという欠
点を有している。それらの問題を解決するため、抵抗環
境性の少ないポリエーテル系材料、特にその中でも体積
抵抗が最も低く、抵抗制御の自由度が大きいエピクロル
ヒドリンゴムを添加することも提案されている。(特開
平1−142569等)As a method of controlling the electrical characteristics of the carrier material, a method of adding conductive particles to an insulating resin (for example, Japanese Patent Application Laid-Open No.
01375, JP-A-2-105181, JP-A-2-10
9071, JP-A-2-109072, JP-A-2-109
075, JP-A-3-284768, JP-A-3-2009
Japanese Patent Application Laid-Open No. Hei.
-152480, JP-A-2-33166, JP-A-2-8
9075, Japanese Unexamined Patent Application Publication No. 3-95574, etc.), however, there are problems in resistance variation depending on locations, reproducibility of resistance, and the like. As a method for solving the above problem, it has been proposed to use an alcohol-soluble nylon as a resistance control agent (for example, JP-A-64-66674, JP-A-64-66676,
JP-A-2-50187). However, since nylon has a large hygroscopicity, there is a disadvantage that the fluctuation of resistance due to the environment is three orders or more, which changes the developing characteristics. In order to solve these problems, it has been proposed to add a polyether-based material having a low resistance environment, particularly an epichlorohydrin rubber having the lowest volume resistance and a high degree of freedom in resistance control. (Japanese Unexamined Patent Publication No. 1-142569 etc.)
【0006】これらの(導電性)現象剤担持体に所定量
の現像剤を担持する方法は、現像剤担持体に現像剤供給
部材を圧接することが一般的であり、例えば102〜1
06Ω・cmの導電性発泡体(特開昭60−22905
7)、スキン層付き弾性体(特開昭60−29060)
及びファーブラシ(特開昭61−42672)等を使用
することが提案されている。これらは、トナーと供給部
材との摩擦帯電性や担持体と供給部材間に電位差を設
け、電気的な効果により担持体上に現像剤を担持するも
のである。The method of carrying a predetermined amount of the developer on the (conductive) agent carrier generally involves pressing a developer supply member against the developer carrier, for example, 10 2 to 1.
0 6 Ω · cm conductive foam (JP 60-22905
7), elastic body with skin layer (JP-A-60-29060)
And the use of fur brushes (Japanese Patent Application Laid-Open No. Sho 61-42672). These devices provide a frictional charging property between the toner and the supply member and a potential difference between the carrier and the supply member, and carry the developer on the carrier by an electrical effect.
【0007】また、帯電性や電位差は初期的なトナー帯
電量、付着量を達成させるだけでなく、現像後の次回帯
電時に速やかに初期の帯電量、付着量を確保すること、
すなわち補給性を向上することにも寄与している。更
に、現像剤供給部材はトナー供給部からトナー漏れ、飛
散等が発生しないようにするためのいわゆる仕切部材と
当接している。In addition, the chargeability and the potential difference not only achieve the initial toner charge amount and adhesion amount, but also ensure the initial charge amount and adhesion amount promptly at the next charging after development.
That is, it also contributes to improving replenishability. Further, the developer supply member is in contact with a so-called partition member for preventing toner leakage, scattering, and the like from the toner supply section.
【0008】[0008]
【発明が解決しようとする課題】前記のように現像材担
持体と供給部材間に電位差を設け、付着量、補給性を確
保しようとすると、導電性ローラではローラ表面のトナ
ー保持力が比較的小さいため(保持は真電荷ではなく、
鏡像電荷による)補給性を上げようと電位差を大きくと
ると、付着量がローラの保持能力を越えてしまい、ロー
ラ上に担持しきれないトナーが薄層化部材から漏れてし
まう、いわゆる“湧き出し”が発生していた。As described above, when a potential difference is provided between the developer carrying member and the supply member to secure the adhesion amount and the replenishability, the toner holding force on the roller surface of the conductive roller is relatively small. Small (retention is not a true charge,
If the potential difference is increased to increase the replenishing ability (by the mirror image charge), the amount of adhesion exceeds the holding capacity of the roller, and the toner that cannot be carried on the roller leaks from the thin layer member. "Has occurred.
【0009】本発明の目的は上記の問題を解消し、湧き
出しが無く、帯電、補給性の立ち上りが優れた現像装置
を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a developing device which does not bleed out and is excellent in charging and replenishment.
【0010】[0010]
【課題を解決するための手段】本発明者は、現像剤供給
部材とトナー仕切部材間に電位差を設けることで前記課
題を解決することを知見し、本発明を完成するに至っ
た。即ち、上記課題は、本発明の(1)「回転駆動され
る1013Ω・cm以下の導電性を有する現像剤担持体
に、必要に応じて補助剤を外添した非磁性一成分系現像
剤を、106Ω・cm以下の導電性を有する現像剤供給
部材により供給し、該現像剤担持体の表面に前記現像剤
を担持して搬送し、潜像担持体と前記現像剤担持体が互
いに対向した現像領域にて、該潜像担持体が形成された
静電潜像を現像剤担持体に担持された前記現像剤によっ
て可視像化する画像形成方法に用いる現像装置であっ
て、該現像剤供給部材に1012Ω・cm以下の導電性を
有するトナー仕切部材が当接されており、該現像剤の帯
電極性により、仕切部材の電位(V1)と供給部材の電
位(V2)が、負帯電性の時、200v≧V1−V2≧
0、正帯電性の時、−200v≦V1−V2≦0となるよ
うに、該現像剤供給部材と該仕切部材間に電位差を設け
たことを特徴とする現像装置」および(2)「前記仕切
部材と摩擦帯電させた時の前記現像剤の帯電量は、負帯
電性現像剤の時、−5μc/g以下、正帯電性現像剤の
時、+5μc/g以上であることを特徴とする前記
(1)項に記載の現像装置」により解決される。Means for Solving the Problems The present inventor has found that the above problem can be solved by providing a potential difference between a developer supply member and a toner partition member, and has completed the present invention. That is, the object of the present invention is to provide (1) a non-magnetic one-component developing method in which an auxiliary agent is externally added to a developer carrier having a conductivity of 10 13 Ω · cm or less, which is rotatably driven. The developer is supplied by a developer supply member having a conductivity of 10 6 Ω · cm or less, the developer is carried on the surface of the developer carrying member and transported, and the latent image carrier and the developer carrying member are transported. A developing device used in an image forming method for visualizing an electrostatic latent image formed with the latent image carrier by the developer carried on the developer carrier in a development region facing each other. A toner partition member having a conductivity of 10 12 Ω · cm or less is in contact with the developer supply member, and the potential (V 1 ) of the partition member and the potential ( When V 2 ) is negatively charged, 200 v ≧ V 1 −V 2 ≧
0, a developing device characterized in that a potential difference is provided between the developer supply member and the partition member such that -200v ≦ V 1 −V 2 ≦ 0 when the device is positively charged ”and (2) “The amount of charge of the developer when frictionally charged with the partition member is −5 μc / g or less for a negatively chargeable developer and +5 μc / g or more for a positively chargeable developer. The developing device according to the above mode (1) ".
【0011】本発明の現像装置を用いる画像形成方法
は、現像剤供給部材へのトナー供給量を仕切部材との電
位差で制御できるので、現像剤担持体へトナーが過剰に
供給されることがなく、従って湧き出しが防止できる。In the image forming method using the developing device of the present invention, the amount of toner supplied to the developer supply member can be controlled by the potential difference from the partition member, so that the toner is not excessively supplied to the developer carrier. , So that welling can be prevented.
【0012】[0012]
【発明の実施の形態】以下、かかる現像装置を用いる画
像形成方法について図面を参照して詳細に説明する。図
1は、本発明の代表的な現像装置の1例の断面図を示
す。図1において、図示しないトナータンクに内蔵され
たトナー(10)はトナー供給スクリュー(20)によ
り現像剤担持体(30)の軸方向へ移動して行く。この
時トナーは現像剤供給部材(40)と仕切部材(50)
及び現像剤担持体(30)とが形成する楔状のトナー溜
まりへ供給される。仕切部材(50)が形成するトナー
溜まり(14)に運ばれたトナー(10)は、所定の電
位差に応じた量のトナーが現像剤供給部材(40)に付
着する。この時、トナー(10)への電荷注入も行わ
れ、殆ど未帯電だったトナー(10)はある程度の帯電
量を所有しており、現像剤供給部材(40)に静電的に
付着するようになり、その上にも存在する多量のトナー
群よりも大きな付着量を持つようになる。次に、このト
ナーは現像剤担持体(30)が形成するトナー溜まり
(12)に移動する。同様に、担持体(30)、供給部
材(40)間の電位差(電界)により、これらのトナー
は現像剤担持体(30)上に保持されることになる。こ
の時、同様に殆ど未帯電のトナー群が供給されるが、ト
ナー帯電量に違いがあるために、予め、仕切部材(5
0)のトナー溜まりで帯電されたトナーが、優先的に現
像剤担持体(30)上に担持される。したがって、仕切
部材(50)のトナー溜まりで現像剤供給部材(40)
上のトナー量を制御すれば、過剰に担持体(30)上に
トナーが供給されることもなく、又ある程度帯電量が大
きいので、担持体(30)上への付着力も大きくなり、
湧き出しも防止できることになる。しかし、仕切部材と
供給部材の電位差が200vを越えると、担持体上のト
ナー付着量が少なく成りすぎ(0.5mg/cm未
満)、逆に不具合が出る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image forming method using such a developing device will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an example of a typical developing device of the present invention. In FIG. 1, the toner (10) contained in a toner tank (not shown) is moved in the axial direction of the developer carrier (30) by a toner supply screw (20). At this time, the toner is supplied to the developer supply member (40) and the partition member (50).
The developer is supplied to a wedge-shaped toner reservoir formed by the developer carrier (30). As for the toner (10) carried to the toner reservoir (14) formed by the partition member (50), an amount of toner corresponding to a predetermined potential difference adheres to the developer supply member (40). At this time, charge is also injected into the toner (10), and the almost uncharged toner (10) has a certain amount of charge, so that the toner (10) is electrostatically attached to the developer supply member (40). , And has a larger adhesion amount than the large amount of toner group existing thereon. Next, the toner moves to a toner reservoir (12) formed by the developer carrier (30). Similarly, due to a potential difference (electric field) between the carrier (30) and the supply member (40), these toners are held on the developer carrier (30). At this time, an almost uncharged toner group is similarly supplied. However, since there is a difference in toner charge amount, the partition member (5
The toner charged in the toner reservoir of 0) is preferentially carried on the developer carrying member (30). Therefore, the developer supply member (40) is stored in the toner pool of the partition member (50).
By controlling the above toner amount, the toner is not excessively supplied to the carrier (30) and the charge amount is large to some extent, so that the adhesive force on the carrier (30) also increases,
Springing can also be prevented. However, if the potential difference between the partition member and the supply member exceeds 200 V, the toner adhesion amount on the carrier becomes too small (less than 0.5 mg / cm), and conversely, a problem occurs.
【0013】本発明における「仕切部材」の定義は、ト
ナー貯蔵部から他部にトナーが漏れるのを防止する部材
で、現像剤供給部材に当接する部分を含有する部材を指
す。図1ではユニット枠体そのものが仕切部材(50)
を含む形をとるが、例えば、図2に示されるようにユニ
ット枠体に更にブレード形状の部材(60)を設けても
よく、図3に示されるようにブラシ状の部材(70)を
設けてもよく、図4に示されるようにローラ状の部材
(80)を設けてもよく、或いは図5に示されるように
ユニット枠体の供給部材当接部に樹脂やゴムシート(8
0)を貼り付けたり、塗装部分(80)などを設けても
良い。The definition of the "partition member" in the present invention refers to a member that prevents toner from leaking from the toner storage section to another section and includes a section that comes into contact with the developer supply member. In FIG. 1, the unit frame itself is a partition member (50).
For example, a blade-shaped member (60) may be further provided on the unit frame as shown in FIG. 2, or a brush-shaped member (70) is provided as shown in FIG. 4, a roller-shaped member (80) may be provided as shown in FIG. 4, or a resin or rubber sheet (8) may be provided at the supply member contact portion of the unit frame as shown in FIG.
0) may be attached, or a painted portion (80) may be provided.
【0014】これら仕切部材の抵抗を制御することによ
り、その効果は増大する。抵抗は1012Ω・cm以下、
好ましくは1010Ω・cm以下が良い。1013Ω・cm
以上になるとトナー付着性を制御することが難しくな
る。仕切部材に有機ポリマー類を用いる時の導電性付与
剤としては、Ni、Cu等の金属粉、カーボンブラッ
ク、酸化スズ、酸化亜鉛、酸化モリブデン、酸化アンチ
モン、酸化チタン等の金属酸化物やそれらのドーピング
物、表面メッキ物等の導電性酸化物、或いはエピクロル
ヒドリンゴム、ニトリルブタジエン共重合体、ポリエー
テルエステルアミド、ボロンポリマー等の中抵抗ポリマ
ーなどが好適に挙げられる。By controlling the resistance of these partition members, the effect is increased. Resistance is 10 12 Ω · cm or less,
Preferably, it is 10 10 Ω · cm or less. 10 13 Ω · cm
Above this, it becomes difficult to control the toner adhesion. As the conductivity imparting agent when using organic polymers for the partition member, metal powders such as Ni and Cu, carbon black, tin oxide, zinc oxide, molybdenum oxide, antimony oxide, metal oxides such as titanium oxide and the like A conductive oxide such as a doping material or a surface plating material, or a medium resistance polymer such as epichlorohydrin rubber, a nitrile butadiene copolymer, a polyetheresteramide, or a boron polymer is preferably used.
【0015】次に仕切部材(50)、(60)、(7
0)、(80)の摩擦帯電性について説明する。仕切部
材の摩擦帯電性が現像剤の帯電極性側に余りに偏りすぎ
ていると、逆極性トナーが発生し、感光体の地肌汚れの
発生原因になり、良くない。負帯電性現像剤の時、−5
μc/g以下,正帯電性現像剤の時、+5μc/g以上
であることが好ましい。q/mの測定方法は次の方法に
よる。Next, the partition members (50), (60), (7)
0) and (80) will be described. If the frictional charging property of the partitioning member is excessively biased toward the charging polarity side of the developer, toner of opposite polarity is generated, which causes the background of the photoconductor to be stained, which is not good. -5 for negatively chargeable developer
μc / g or less, and preferably +5 μc / g or more for a positively chargeable developer. The measuring method of q / m is as follows.
【0016】測定方法 20φ径ローラの表面に測定サンプルを塗工、貼り付け
たものを2本用意し、図7の装置に装着する。ローラ間
隙は50μm、ローラ線速比1;05で回転させる。こ
こに約1mgのトナーを付着させ、5分回転後ローラを
止め、ローラ上のトナーq/mを測定する。Measuring Method Two measuring samples are prepared by coating and affixing a measuring sample on the surface of a 20φ diameter roller, and are mounted on the apparatus shown in FIG. The roller is rotated at a roller gap of 50 μm and a roller linear velocity ratio of 1:05. Approximately 1 mg of toner is adhered thereto, and after 5 minutes rotation, the roller is stopped, and the toner q / m on the roller is measured.
【0017】[0017]
実施例と比較例1 負帯電性トナーを例に説明する。図1の仕切部材(5
0)がA1金属、現像剤供給部材(30)がウレタンス
ポンジローラ(106Ω・cm)及び薄層化形成部材
(80)がSUSブレードである現像ユニットに次の現
像剤担持体を装着した。トナーは負帯電性のものを用い
た。Examples and Comparative Example 1 A negatively chargeable toner will be described as an example. The partition member (5 in FIG. 1)
0) was A1 metal, the developer supply member (30) was a urethane sponge roller (10 6 Ω · cm), and the thinning member (80) was a SUS blade, and the following developer carrier was mounted on a development unit. . The toner used was negatively charged.
【0018】 現像剤担持体の制作方法 処方 アクリル変成シリコン樹脂(KR9706;信越化学) 100重量部 エピクロルヒドリンゴム(エピクロマーCG;ダイソー) 60重量部 硬化剤(SH6020;トーレシリコーン) 10重量部 塗工法:スプレー塗装、硬化条件:150℃/1時間 硬化後、研磨を施し膜厚30μm、体積抵抗2×1012
Ω・cmの担持体を得た。現像剤担持体電位−150
v、現像剤供給部材電位−350v,SUSブレード電
位−350vに固定し、仕切部材の電位を下表のように
変化させ、湧き出し性、現像剤担持体上のq/m(単位
重量当たりのトナー帯電量)、m/a(単位面積当たり
のトナー付着量)を評価した。Method for Producing Developer Carrier Prescription Acrylic-modified silicone resin (KR9706; Shin-Etsu Chemical) 100 parts by weight Epichlorohydrin rubber (Epichromer CG; Daiso) 60 parts by weight Curing agent (SH6020; Toray silicone) 10 parts by weight Coating method: spray Coating and curing conditions: 150 ° C./1 hour After curing, polished to a film thickness of 30 μm and a volume resistance of 2 × 10 12
An Ω · cm support was obtained. Developer carrier potential -150
v, the developer supply member potential -350v, the SUS blade potential -350v, and the potential of the partition member is changed as shown in the table below to obtain the springing property, q / m on the developer carrier (per unit weight). The toner charge amount) and m / a (toner adhesion amount per unit area) were evaluated.
【0019】[0019]
【表1】 湧き出しランク評価方法 ランク○〜全く湧き出し無し △〜定量不可能なほど僅かに湧き出し ×〜湧き出しトナーがブレード下に落下するほど大量に
湧き出し(△迄許容される) 電位差が0vを下回ると湧き出し性が悪化する。q/
m、m/aの結果を図6に示す。電位差が200vを越
えると担持体上付着量m/aが許容限界を越えてしま
う。[Table 1] Source rank evaluation method Rank ○ ~ No source at all △ ~ Slightly sourced so as not to be quantifiable × ~ Sourced at a large amount as the source toner drops under the blade (allowable up to Δ) Potential difference is 0v If it falls below, the springability deteriorates. q /
FIG. 6 shows the results of m and m / a. If the potential difference exceeds 200 V, the amount m / a of adhesion on the carrier exceeds the allowable limit.
【0020】実施例と比較例2 仕切部材としてアクリル樹脂(ポリメチルメタクリルレ
ート)及びフッ素樹脂とアクリル樹脂のブレンド品(ノ
バフッソ;大日本色材)を各ブレンド比(ノバフッソ/
PMMA)に混合し、導電性粒子としてカーボンブラッ
ク10重量部(樹脂100重量部に対し)を分散した
後、MEK/酢酸エチル溶剤に希釈し、図1の供給部材
当接部に塗工(80)した。体積抵抗は105Ω・cm
であった。前記と同様のトナー、及びOPC感光体を用
いて感光体の地肌汚れを測定した。又、同様に前述の方
法でトナーq/mを測定した。Examples and Comparative Example 2 An acrylic resin (polymethyl methacrylate) and a blended product of a fluororesin and an acrylic resin (Novafusso; Dainippon Color Co., Ltd.) were used as a partition member at each blend ratio (Novafusso /
PMMA) and 10 parts by weight of carbon black (based on 100 parts by weight of resin) dispersed as conductive particles, diluted with MEK / ethyl acetate solvent, and applied to the supply member contact portion of FIG. )did. Volume resistance is 10 5 Ω · cm
Met. Using the same toner as described above and the OPC photoreceptor, background contamination of the photoreceptor was measured. The toner q / m was measured in the same manner as described above.
【0021】地肌汚れ測定法 現像転写済みの複写紙の地肌部に透明テープを押し付け
て複写紙に付着したトナーを透明テープに奪い取り、ト
ナーを保持した透明テープを白紙に貼り付ける。新品の
テープも同様に白紙に貼り付け、マクベス濃度計で濃度
を測定する。△ID=ID(トナー付着テープ)−ID
(新品テープ)、許容限界は0.03である。Background Stain Measurement Method A transparent tape is pressed against a background portion of a copy paper on which development and transfer have been performed, and the toner adhered to the copy paper is robbed by the transparent tape, and the transparent tape holding the toner is attached to a white paper. A new tape is similarly stuck on blank paper, and the density is measured with a Macbeth densitometer. ΔID = ID (toner attached tape) −ID
(New tape), allowable limit is 0.03.
【0022】[0022]
【表2】 [Table 2]
【0023】[0023]
【発明の効果】以上詳細かつ具体的に説明したように、
本発明の現像装置は、現像剤供給部材と仕切部材との電
位差を所定の範囲にすることで、薄層化形成部材からの
トナー湧き出しを防止し、且つ現像剤担持体上のトナー
付着を適正なものにし、また、又、仕切部材と現像剤の
摩擦帯電性を制御することより、感光体の地肌汚れを防
止できるという極めて優れた効果を発揮する。As described above in detail and specifically,
The developing device of the present invention prevents the toner from flowing out from the thin layer forming member by setting the potential difference between the developer supply member and the partition member within a predetermined range, and prevents toner from adhering on the developer carrying member. By controlling the frictional charging property between the partition member and the developer, an extremely excellent effect of preventing background contamination of the photoreceptor can be exhibited.
【図1】本発明の現像装置の1例の断面図を示した図で
ある。FIG. 1 is a sectional view showing an example of a developing device according to the present invention.
【図2】本発明の現像ユニット枠体に設ける仕切部材の
1例を示す図である。FIG. 2 is a view showing an example of a partition member provided on a developing unit frame of the present invention.
【図3】本発明の現像ユニット枠体に設ける仕切部材の
他の1例を示す図である。FIG. 3 is a view showing another example of a partition member provided on the developing unit frame of the present invention.
【図4】本発明の現像ユニット枠体に設ける仕切部材の
更に他の1例を示す図である。FIG. 4 is a view showing still another example of the partition member provided on the developing unit frame of the present invention.
【図5】本発明の現像ユニット枠体に設ける仕切部材の
更に他の1例を示す図である。FIG. 5 is a view showing still another example of the partition member provided on the developing unit frame of the present invention.
【図6】本発明の現像装置例における単位重量当たりの
トナー帯電量(q/m;μc/g)、単位面積当たりの
トナー付着量(m/a;mg/cm2)の1例を示した
図である。FIG. 6 shows an example of a toner charge amount per unit weight (q / m; μc / g) and a toner adhesion amount per unit area (m / a; mg / cm 2 ) in the example of the developing device of the present invention. FIG.
【図7】本発明の現像装置によるトナーの帯電状態を測
定する装置例である。FIG. 7 is an example of an apparatus for measuring a charged state of toner by the developing device of the present invention.
10 トナー 12 トナー溜まり 14 トナー溜まり 20 トナー搬送スクリュー 21 トナー回収スクリュー 30 現像剤担持体 40 供給部材 50 仕切部材 60 ブレード 70 ブラシ 80 ローラ 90 シート(貼り付け) DESCRIPTION OF SYMBOLS 10 Toner 12 Toner pool 14 Toner pool 20 Toner conveyance screw 21 Toner collection screw 30 Developer carrier 40 Supply member 50 Partition member 60 Blade 70 Brush 80 Roller 90 Sheet (pasting)
Claims (2)
電性を有する現像剤担持体に、必要に応じて補助剤を外
添した非磁性一成分系現像剤を、106Ω・cm以下の
導電性を有する現像剤供給部材により供給し、該現像剤
担持体の表面に前記現像剤を担持して搬送し、潜像担持
体と前記現像剤担持体が互いに対向した現像領域にて、
該潜像担持体が形成された静電潜像を現像剤担持体に担
持された前記現像剤によって可視像化する画像形成方法
に用いる現像装置であって、該現像剤供給部材に1012
Ω・cm以下の導電性を有するトナー仕切部材が当接さ
れており、該現像剤の帯電極性により、仕切部材の電位
(V1)と供給部材の電位(V2)が、負帯電性の時、2
00v≧V1−V2≧0、正帯電性の時、−200v≦V
1−V2≦0となるように、該現像剤供給部材と該仕切部
材間に電位差を設けたことを特徴とする現像装置。1. A non-magnetic one-component developer in which an auxiliary agent is externally added to a developer carrier having a conductivity of 10 13 Ω · cm or less, which is driven to rotate, is supplied to a developer carrier of 10 6 Ω · cm. The developer is supplied by a developer supply member having the following conductivity, the developer is carried on the surface of the developer carrier and transported, and the latent image carrier and the developer carrier are opposed to each other in a developing area. ,
A developing device used in the image forming method of a visible image by the developing agent carried an electrostatic latent image latent image bearing member is formed on the developer carrying member, 10 12 to the developer supply member
Omega · cm toner partition member having the conductive are abutting, the charge polarity of the developer, the potential of the partition member (V 1) and the potential of the supply member (V 2) is negatively chargeable Hour 2
00v ≧ V 1 −V 2 ≧ 0, -200v ≦ V when positively charged
A developing device, wherein a potential difference is provided between the developer supply member and the partition member such that 1− V 2 ≦ 0.
現像剤の帯電量は、負帯電性現像剤の時、−5μc/g
以下、正帯電性現像剤の時、+5μc/g以上であるこ
とを特徴とする請求項第1項に記載の現像装置。2. The amount of charge of the developer when frictionally charged with the partition member is −5 μc / g for a negatively chargeable developer.
2. The developing device according to claim 1, wherein the value is +5 μc / g or more for a positively chargeable developer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10398597A JPH10282785A (en) | 1997-04-08 | 1997-04-08 | Developing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10398597A JPH10282785A (en) | 1997-04-08 | 1997-04-08 | Developing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10282785A true JPH10282785A (en) | 1998-10-23 |
Family
ID=14368613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10398597A Pending JPH10282785A (en) | 1997-04-08 | 1997-04-08 | Developing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10282785A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014074751A (en) * | 2012-10-03 | 2014-04-24 | Bando Chem Ind Ltd | Conductive roller for electrophotographic device |
-
1997
- 1997-04-08 JP JP10398597A patent/JPH10282785A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014074751A (en) * | 2012-10-03 | 2014-04-24 | Bando Chem Ind Ltd | Conductive roller for electrophotographic device |
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