JPH0192779A - Developing method - Google Patents
Developing methodInfo
- Publication number
- JPH0192779A JPH0192779A JP24995887A JP24995887A JPH0192779A JP H0192779 A JPH0192779 A JP H0192779A JP 24995887 A JP24995887 A JP 24995887A JP 24995887 A JP24995887 A JP 24995887A JP H0192779 A JPH0192779 A JP H0192779A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- magnetic
- magnetic particle
- magnetic particles
- carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 13
- 239000006249 magnetic particle Substances 0.000 claims abstract description 46
- 230000002093 peripheral effect Effects 0.000 claims description 7
- PMYDPQQPEAYXKD-UHFFFAOYSA-N 3-hydroxy-n-naphthalen-2-ylnaphthalene-2-carboxamide Chemical compound C1=CC=CC2=CC(NC(=O)C3=CC4=CC=CC=C4C=C3O)=CC=C21 PMYDPQQPEAYXKD-UHFFFAOYSA-N 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 7
- 238000005192 partition Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G13/00—Electrographic processes using a charge pattern
- G03G13/06—Developing
- G03G13/08—Developing using a solid developer, e.g. powder developer
- G03G13/09—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)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、非接触現像の技術分野に−おいて利用され、
特にビクトリアル・カラーの現像装置にも適用可部な現
像剤を用いた現像方法に関する。Detailed Description of the Invention (Industrial Application Field) The present invention is used in the technical field of non-contact development,
In particular, the present invention relates to a developing method using a developer that is applicable to Victorian color developing devices.
（従来の技術及び問題点）
現像スリーブは回転し、内部には静止せる磁界発生手段
を有していてその磁気力によって外周表面に現像剤を担
持するように形成されている。そして、現像スリーブが
感光ドラムと対向して形成される最狭領域に、磁界発生
手段の磁極間がくるように磁界発生手段を位置せしめて
、上記領域を現像領域としている。該現像領域における
現像スリーブ上での磁力線を現像スリーブ外周表面と平
行ならしめ、この平行磁力線で磁性粒子を浮遊状態で担
持して現像剤層を形成している。現像領域における感光
ドラムと現像スリーブとの間隙（現像間隙）は現像剤層
の厚みよりも大きく設定されている。(Prior Art and Problems) The developing sleeve rotates and has a stationary magnetic field generating means inside thereof, and is formed so that the developer is supported on the outer circumferential surface by the magnetic force of the developing sleeve. Then, the magnetic field generating means is positioned so that the magnetic poles of the magnetic field generating means are located in the narrowest area where the developing sleeve is formed facing the photosensitive drum, thereby making the above area a developing area. The lines of magnetic force on the developing sleeve in the developing area are made parallel to the outer peripheral surface of the developing sleeve, and the parallel magnetic lines of force support magnetic particles in a floating state to form a developer layer. The gap (development gap) between the photosensitive drum and the development sleeve in the development area is set to be larger than the thickness of the developer layer.
この現像間隙に交互電界を形成して、磁性粒子を現像ス
リーブ外周表面に拘束しつつ、磁性粒子の表面に付着保
持されている顕画側粒子を感光ドラムの画像領域及び非
画像領域へ飛翔させる工程と、余分な顕画側粒子を現像
スリーブへ戻す工程を交互に繰り返すことによって上記
現像剤による現像か行われていた。An alternating electric field is formed in this development gap to restrain the magnetic particles on the outer circumferential surface of the developing sleeve, while causing the particles on the developing side attached and held on the surface of the magnetic particles to fly to the image area and non-image area of the photosensitive drum. Development with the above-mentioned developer was performed by alternately repeating the process and the process of returning excess particles on the developing side to the developing sleeve.
しかしながら、上記現像剤及びこの現像剤による現像方
法では、現像剤が、通常の球状の磁性粒子と非磁性粒子
とを混合してなる場合は、現像剤層の厚みを薄くするこ
とか困難なので現像間隙は広くしなければならない。こ
の場合、電極間隙が広くなりいわゆるエツジ効果を改善
できない問題があった。However, in the above-mentioned developer and the developing method using this developer, when the developer is made of a mixture of ordinary spherical magnetic particles and non-magnetic particles, it is difficult to reduce the thickness of the developer layer. The gap must be wide. In this case, there was a problem in that the gap between the electrodes became wide, making it impossible to improve the so-called edge effect.
このエツジ効果を少なくするために単に現像剤層を薄く
すると、現像剤の搬送量が不足し全体に濃度が低下する
という問題が生じる。また、薄層化のために層厚を規制
する規制部材と現像スリーブ外周表面間が極めて狭くな
るので、現像剤の凝集が起こり白筋が発生する問題も生
じる。このような現象は白黒現像の場合はもとより、カ
ラー現像、特にビクトリアル・カラーをねらった高画質
現像の場合ではさらに重大な問題となっていた。If the developer layer is simply made thinner in order to reduce this edge effect, a problem arises in that the amount of developer transported is insufficient and the overall density is lowered. Further, since the distance between the regulating member that regulates the layer thickness and the outer circumferential surface of the developing sleeve becomes extremely narrow due to the thinning of the layer, a problem arises in that developer aggregation occurs and white streaks occur. This phenomenon has become a serious problem not only in black and white development, but also in color development, particularly in high-quality development aimed at Victorian color.
そこで、現像剤の磁性粒子の粒径を、非磁性粒子の粒径
に対して、例えば、約数倍程度、換言すると２１）〜３
０ルｌにまで小径化して、現像剤層を薄くして現像を行
う方法が提案されている。Therefore, the particle size of the magnetic particles of the developer is, for example, about several times the particle size of the non-magnetic particles, in other words, 21) to 3
A method has been proposed in which the diameter is reduced to 0.0 l and the developer layer is made thinner to perform development.
しかしながら、この現像剤及びこの現像剤による現像方
法では磁性粒子の粒径が小さい故に新たな問題か生じる
。すなわち、磁性粒子か現像スリーブ側の磁力線よりも
感光ドラム側の電界に強く引かれてしまい感光ドラムへ
移動してしまう傾向となる。このため、磁性粒子は感光
ドラムに付着し易くなり、長期に亘って現像を続けると
現像器内の磁性粒子量が著しく減少し、磁性粒子と非磁
性粒子との混合比調和が崩れいわゆる地力ブリが生じた
りする。また、感光ドラムに付着した磁性粒子をクリー
ニング装置で除去しなければならないので感光ドラムに
傷がつく等の問題も生じている。However, with this developer and the developing method using this developer, a new problem arises because the particle size of the magnetic particles is small. That is, the magnetic particles tend to be more strongly attracted by the electric field on the photosensitive drum side than by the lines of magnetic force on the developing sleeve side, and thus move toward the photosensitive drum. For this reason, magnetic particles tend to adhere to the photosensitive drum, and if development is continued for a long period of time, the amount of magnetic particles in the developing device decreases significantly, and the harmonious mixing ratio of magnetic particles and non-magnetic particles is disrupted, resulting in so-called land force problems. may occur. Further, since the magnetic particles attached to the photosensitive drum must be removed by a cleaning device, problems such as damage to the photosensitive drum occur.
（問題点を解決するための手段）
本発明は、上述の問題点を解決するもので、その目的は
、非磁性粒子の付着量を減することなく現像剤担持体上
の現像剤層を薄くてきかつ磁性粒子の感光ドラムへの付
着防止を可能とし、高画質の画像を長期間に亘って得る
ことができる現像方法を提供することにある。(Means for Solving the Problems) The present invention solves the above-mentioned problems, and its purpose is to thin the developer layer on the developer carrier without reducing the amount of non-magnetic particles attached. It is an object of the present invention to provide a developing method that makes it possible to prevent strong magnetic particles from adhering to a photosensitive drum and to obtain high-quality images over a long period of time.
本発明は、上記目的達成のために、
潜像保持体と、内部に静止せる磁界発生手段を有し、該
磁界発生手段の磁気力によって外周表面に現像剤を担持
する現像剤担持体とを備え、該現像剤担持体を上記潜像
保持体に近接配置し、該近接部分を上記磁界発生手段の
隣接する二つの異磁極間に位置せしめて、ここに現像領
域を形成せしめ、磁性粒子と非磁性粒子とを混合して成
る現像剤を、上記磁気力によって現像剤担持体に保持さ
れる上記磁性粒子の表面に上記非磁性粒子を付着させる
ことにより上記現像剤担持体の外周表面に担持させ、潜
像保持体と現像剤担持体との間のバイアス電圧により、
非磁性粒子を潜像保持体に飛翔させて現像する方法にお
いて。In order to achieve the above object, the present invention comprises: a latent image holding member; and a developer carrying member which has a stationary magnetic field generating means inside and carries a developer on its outer peripheral surface by the magnetic force of the magnetic field generating means. The developer carrier is disposed close to the latent image carrier, and the proximate portion is positioned between two adjacent different magnetic poles of the magnetic field generating means to form a development area there, and the magnetic particles and A developer mixed with non-magnetic particles is supported on the outer circumferential surface of the developer carrier by attaching the non-magnetic particles to the surface of the magnetic particles held on the developer carrier by the magnetic force. By applying a bias voltage between the latent image carrier and the developer carrier,
In a method of developing by flying non-magnetic particles onto a latent image carrier.
上記磁性粒子を楕円体状に形成し、該磁性粒子の長軸が
上記現像剤担持体の外周表面にほぼ平行な状態で磁力線
に沿って保持されている。The magnetic particles are formed into an ellipsoidal shape, and are held along the lines of magnetic force with the long axis of the magnetic particles substantially parallel to the outer circumferential surface of the developer carrier.
ことによって構成されている。It is made up of.
（実施例）
以下、添付図面の第１図及び第２図にもとづいて本発明
の一実施例を説明する。(Embodiment) Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 and 2 of the accompanying drawings.
第２図には、本実施例に用いられる現像装置全体の概要
構成が示されている。この現像装置には潜像保持体１（
以下感光ドラムという）が矢印Ｂ方向に回転可能に設置
されている。感光ドラムｌは、背０面電極１１と静電潜
像保持体１２とよりなり、静電潜像保持体１２は絶縁体
層か、または電子写真感光体層の何れかで形成されてい
る。この感光トラムｌに近接させて現像剤担持体２（以
下現像スリーブという）が矢印入方向に回転可能に設置
され、現像スリーブ２の感光ドラムｌへの最近接部分の
間隙は例えば約１００〜８００鉢■、好ましくは３００
〜ＳＯＯ＃Ｌ■にしである。現像スリーブ２は、容器１
３の開口部１４から感光ドラム１側に近接するように一
部突出して設けられ、感光ドラムｌへの上記近接部分に
現像領域４を形成するとともに、内部には、静止せる磁
界発生手段としての多極性磁石３（以下磁石とする）を
備えている。FIG. 2 shows a general configuration of the entire developing device used in this embodiment. This developing device includes a latent image holding body 1 (
A photosensitive drum (hereinafter referred to as a photosensitive drum) is installed so as to be rotatable in the direction of arrow B. The photosensitive drum 1 includes a back electrode 11 and an electrostatic latent image holder 12, and the electrostatic latent image holder 12 is formed of either an insulating layer or an electrophotographic photosensitive layer. A developer carrier 2 (hereinafter referred to as a developing sleeve) is installed in close proximity to the photosensitive drum 1 so as to be rotatable in the direction of the arrow. Pot ■, preferably 300
〜SOO#L■ Nishishido. The developing sleeve 2 is connected to the container 1
A developing area 4 is formed in the vicinity of the photosensitive drum 1, and a developing area 4 is provided in the opening 14 of the photosensitive drum 1 so as to be close to the photosensitive drum 1 side. It is equipped with a multipolar magnet 3 (hereinafter referred to as magnet).
磁石３は、磁極Ｎ＋、Ｓｌと磁極Ｎ、、Ｓ、の二対の磁
極が設定され、磁極Ｎ、、Ｓ□間の中心角度θは、約４
５″≦０≦ １４５ ’となっている。この現像スリー
ブ２と、上記背面電極１１との間には、直流電源５に交
流電源６が重量されたバイアス電圧が印加されている。The magnet 3 has two pairs of magnetic poles: magnetic poles N+, Sl and magnetic poles N,, S, and the center angle θ between the magnetic poles N,, S□ is approximately 4.
5''≦0≦145'. A bias voltage in which the AC power source 6 is added to the DC power source 5 is applied between the developing sleeve 2 and the back electrode 11.
上記容器１３の中間部には、開口部１６をもつ仕切板１
５が設けられていてその上部を非磁性粒子Ｔ（以下トナ
ーという）のためのストック空間としている。上記仕切
板１５の開口部１６には、凹凸面をもつトナー補給ロー
ラ１７が臨んでいる。トナー補給ローラ１７は、感光ド
ラムｌの駆動歯車（図示せず）に噛合した現像スリーブ
２の駆動歯車（図示せず）の回転によってゆっくり矢印
り方向に回転せられるようになっている。トナー補給ロ
ーラ１７の下部には、弾性部材１８の一端が当接させで
ある。この弾性部材１８の他端はここでは仕切板１５の
右部に取付られ、トナー補給ローラ１７の回転による振
動により、仕切板１５上の空間に蓄積されたトナーＴを
仕切板１５の下方に形成される現像室１９内へ少しづつ
落すように設定されている。したがって、上記容器１３
は現像剤７のホッパーを形成している二
また、容器１３には、磁極Ｎ、と磁極Ｓ１との磁極間の
位置で、現像スリーブ２に対向して現像剤７の層厚を規
制する規制部材２０が設けられている。規制部材２０は
、非磁性体よりなり、該規制部材２０の先端が現像スリ
ーブ２の外周表面から約１００〜５５０ルー、好ましく
は１５０〜４５０終ｔａ＠隔した位置に設置されている
。この規制部材２０には、上記直流電源５に交流電源６
を重畳したバイアス電圧が印加されていて、現像スリー
ブ２と電気的に同電位になっている。この規制部材２０
には取付部材２１を介して均し板２２が設置されている
。均し板２２は、例えばマイラやウレタンゴム等の弾性
部材よりなり、層厚が規制された現像剤７を均一化する
ように形成されている。なお、均し板２２は省略するこ
とも可能である。A partition plate 1 having an opening 16 is provided in the middle of the container 13.
5 is provided, and the upper part thereof is used as a stock space for non-magnetic particles T (hereinafter referred to as toner). A toner supply roller 17 having an uneven surface faces the opening 16 of the partition plate 15 . The toner supply roller 17 is configured to be slowly rotated in the direction indicated by the arrow by rotation of a drive gear (not shown) of the developing sleeve 2 that meshes with a drive gear (not shown) of the photosensitive drum l. One end of the elastic member 18 is brought into contact with the lower part of the toner supply roller 17 . The other end of this elastic member 18 is attached to the right side of the partition plate 15 here, and the toner T accumulated in the space above the partition plate 15 is formed below the partition plate 15 by vibration caused by the rotation of the toner supply roller 17. It is set so that it is dropped little by little into the developing chamber 19. Therefore, the container 13
is a bifurcated fork forming a hopper for the developer 7, and in the container 13, there is a regulation for regulating the layer thickness of the developer 7 facing the developing sleeve 2 at a position between the magnetic poles N and S1. A member 20 is provided. The regulating member 20 is made of a non-magnetic material, and the distal end of the regulating member 20 is placed at a distance of approximately 100 to 550 ru, preferably 150 to 450 ru, from the outer peripheral surface of the developing sleeve 2. This regulating member 20 has an AC power supply 6 to the DC power supply 5.
A bias voltage that is superimposed is applied to the developing sleeve 2, so that it is electrically at the same potential as the developing sleeve 2. This regulating member 20
A leveling plate 22 is installed through a mounting member 21. The leveling plate 22 is made of an elastic member such as mylar or urethane rubber, and is formed to uniformize the developer 7 having a regulated layer thickness. Note that the leveling plate 22 can also be omitted.
一方、現像剤７は、磁性粒子Ｍ（以下キャリアという）
とトナーＴとを混合して形成されている。キャリアＭは
、楕円体状に形成され、短軸の平均の長さか長軸の平均
の長さの約局以下となっている。例えば短軸長さを約３
０ル■以上（好ましくは約４０〜６０ＪＪ、■）とする
と、長軸の長さはその３倍である約９０１Ｌ−以上とい
うことになる。このキャリアＭは、例えばスチレン・ア
クリル・アミノアクリル共重合体樹脂を主成分とした樹
脂中に、マグネタイト（Ｆｅｚ０４）の磁性粉を７５％
ｉｔ混練し、粉砕後熱風中に浮遊させて、冷却した金属
等に激突させることにより上記楕円体状に形成させるこ
とができる。また、樹脂に顔料や染料等の荷電制御剤を
混入して、トナーＴが所定の極性かつ帯電量となるよう
に形成することもできる。On the other hand, the developer 7 contains magnetic particles M (hereinafter referred to as carrier).
It is formed by mixing and toner T. The carrier M is formed into an ellipsoid shape, and the average length of the short axis is approximately equal to or less than the average length of the long axis. For example, the short axis length is about 3
If it is 0 liters or more (preferably about 40 to 60 JJ, 2), the length of the major axis will be about 901L or more, which is three times that length. This carrier M contains, for example, 75% magnetic powder of magnetite (Fez04) in a resin whose main component is styrene-acrylic-aminoacrylic copolymer resin.
The above-mentioned ellipsoidal shape can be formed by kneading it, pulverizing it, suspending it in hot air, and colliding it against a cooled metal or the like. Alternatively, a charge control agent such as a pigment or dye may be mixed into the resin so that the toner T has a predetermined polarity and charge amount.
トナーＴは、例えば熱可塑性樹脂（ポリスチレン）を主
成分とした体積平均粒径約５１Ｌｍの粒子として形成さ
れ、キャリアＭに対して負極性に帯電するように設定し
である。The toner T is formed as particles having a volume average particle size of about 51 Lm, for example, mainly composed of a thermoplastic resin (polystyrene), and is set to be negatively charged with respect to the carrier M.
このトナーＴの個数平均粒径ＤＴは、キャリアＭの個数
平均粒径Ｄ２に対してＤ７≦Ｄ、≦３０Ｄアの範囲にあ
るようにして安定した高画質の画像が得られるように設
定されている。The number average particle diameter DT of the toner T is set within the range of D7≦D and ≦30D with respect to the number average particle diameter D2 of the carrier M so that a stable high-quality image can be obtained. There is.
また、トナーＴとキャリアＭの混合比は例えば１０ｗｔ
１〜４０ｗｔ＄の広い範囲内で選択可能として、トナー
濃度の制御を容易化し、地力ブリの無い現像濃度の高い
画像が得られるように設定されている。Further, the mixing ratio of toner T and carrier M is, for example, 10wt.
It can be selected within a wide range of 1 to 40 wt$, and is set to facilitate the control of toner density and to obtain images with high developed density without blurring.
トナーＴは、容器１３の上部から現像室１９へ落下した
後、現像スリーブ２の矢印Ａ方向への回転によって、矢
印Ｃ方向へ移動しキャリアＭに混合されて上記現像剤７
が形成される。この混合時の摩擦で生ずる静電気力によ
ってトナーＴはキャリアＭの表面に付着する。After the toner T falls from the upper part of the container 13 into the developing chamber 19, as the developing sleeve 2 rotates in the direction of the arrow A, the toner T moves in the direction of the arrow C, is mixed with the carrier M, and is mixed with the developer 7.
is formed. The toner T adheres to the surface of the carrier M due to the electrostatic force generated by friction during this mixing.
次に上記のととくの現像剤７による現像方法について述
べる。Next, a developing method using the above-mentioned developer 7 will be described.
トナーＴが付着したキャリアＭは、磁極Ｓ２．Ｎ２間に
作用する磁力線によって現像スリーブ２の外周表面に担
持されて、現像領域４まて搬送される。The carrier M to which the toner T has adhered is moved to the magnetic pole S2. It is supported on the outer circumferential surface of the developing sleeve 2 by the lines of magnetic force acting between N2 and transported to the developing area 4.
そして、現像領域４に到達すると、第１図に示すように
トナーＴを付着したキャリアＭは、現像スリーブ２の現
像領域４での外周表面にほぼ平行に作用する磁極Ｎ＋、
Ｓｔ間の複数の磁力線２３によって担持される。その場
合、楕円体状のキャリアＭはその長軸か上記磁力線２３
に沿って寝たような姿勢をとるようになる。When the carrier M has the toner T attached thereto, as shown in FIG.
It is supported by a plurality of lines of magnetic force 23 between St. In that case, the ellipsoidal carrier M has its long axis or the magnetic field line 23
The child begins to take a sleeping position along the lines.
このように担持されるキャリアＭは、その質量を所定値
のものとし多層状態で現像剤層７を形成しても、その層
は薄くなり、その結果、キャリアＭは現像スリーブ２上
て磁力線２３によって強く拘束されなからも、感光ドラ
ムｌ側の電界の影響をあまり受けることなく、感光ドラ
ムｌ側へ飛翔しなくなる。しかもキャリアＭは楕円体状
をなしているのでその表面積は所定値だけ確保てき、十
分なる量のトナーＴを付着せしめることかできる。Even if the carrier M supported in this way has a predetermined mass and forms the developer layer 7 in a multi-layered state, the layer becomes thin, and as a result, the carrier M moves onto the developing sleeve 2 and forms the magnetic field lines 23. Even if it is not strongly restrained by the photosensitive drum l side, it is not affected much by the electric field on the photosensitive drum l side and does not fly toward the photosensitive drum l side. Furthermore, since the carrier M has an ellipsoidal shape, its surface area can be secured to a predetermined value, and a sufficient amount of toner T can be deposited on the carrier M.
かくして、現像領域４での現像スリーブ２の外周表面は
Ｓ層でかつ十分なる量の現像剤７で完全に覆われる。こ
のため、不要なトナーＴは感光トラムｌ側に吸引されず
現像されることかないので地力ブリが発生しなくなる。Thus, the outer peripheral surface of the developing sleeve 2 in the developing area 4 is completely covered with the S layer and a sufficient amount of the developer 7. For this reason, unnecessary toner T is not attracted to the photosensitive tram l side and is not developed, so that no ground force blur occurs.
また、トナーＴは十分なる量が担持されているのでいわ
ゆるベタ黒濃度が良好となる。Further, since a sufficient amount of toner T is carried, so-called solid black density is good.
（発明の効果）
本発明は、現像剤の磁性粒子を楕円体状に形成し、この
磁性粒子を現像領域に対向する現像剤担持体の外周表面
に、上記磁性粒子の長軸か現像剤担持体の外周表面にほ
ぼ平行する状態で担持させて現像することとしたので、
現像領域における現像剤は現像剤担持体の外周表面に、
多層（積層）状態で担持され、しかも、外周表面は完全
に被覆されるばかりでなくその層厚は厚くならない。(Effects of the Invention) The present invention forms magnetic particles of a developer into an ellipsoidal shape, and places the magnetic particles on the outer circumferential surface of a developer carrier facing the development area so that the long axis of the magnetic particles is aligned with the developer carrier. Since we decided to develop the film by supporting it almost parallel to the outer circumferential surface of the body,
The developer in the development area is distributed on the outer peripheral surface of the developer carrier.
It is supported in a multi-layered (laminated) state, and not only the outer circumferential surface is completely covered, but the layer thickness does not increase.
その結果、潜像保持体に磁性粒子が付着しなくなり、必
要かつ十分なる量の非磁性粒子のみが現像領域へ移動す
るので安定した高画質の画像を長期間に亘って得られる
。特に、ビクトリアル・カラーでは高画質の画像が得ら
れ現像装置の信頼性が向上するという効果を得る。As a result, magnetic particles do not adhere to the latent image carrier, and only a necessary and sufficient amount of non-magnetic particles move to the development area, so that stable, high-quality images can be obtained over a long period of time. In particular, with Victorian color, high quality images can be obtained and the reliability of the developing device can be improved.
第１図は本発明の一実施例としての現像方法を示す現像
部を示す縦断面図、第２図は第１図の現像部をもつ現像
装置の顆要構成を示す縦断面図である。
１−−−−−・・・・潜像保持体（感光ドラム）２・・
・・・・・・・現像剤担持体（現像スリーブ）７・・・
・・・・・・現像剤
Ｓ・・・・・・・・・キャリア
Ｔ・・・・・・・・・トナー
特許出願人 キャノン株式会社代 理 人
弁理士 藤 岡 徹第 １ 図FIG. 1 is a longitudinal sectional view showing a developing section showing a developing method as an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing the essential structure of a developing device having the developing section shown in FIG. 1-----...Latent image holder (photosensitive drum) 2...
...Developer carrier (development sleeve) 7...
...Developer S...Carrier T...Toner patent applicant Canon Co., Ltd. Agent Patent attorney Toru Fujioka Figure 1
Claims (1)
磁界発生手段の磁気力によって外周表面に現像剤を担持
する現像剤担持体とを備え、該現像剤担持体を上記潜像
保持体に近接配置し、該近接部分を上記磁界発生手段の
隣接する二つの異磁極間に位置せしめて、ここに現像領
域を形成せしめ、磁性粒子と非磁性粒子とを混合して成
る現像剤を、上記磁気力によって現像剤担持体に保持さ
れる上記磁性粒子の表面に上記非磁性粒子を付着させる
ことにより上記現像剤担持体の外周表面に担持させ、潜
像保持体と現像剤担持体との間のバイアス電圧により、
非磁性粒子を潜像保持体に飛翔させて現像する方法にお
いて、 上記磁性粒子を楕円体状に形成し、該磁性粒子の長軸が
上記現像剤担持体の外周表面にほぼ平行な状態で磁力線
に沿って保持されている、 ことを特徴とする現像方法。[Scope of Claims] A latent image holding member, a developer carrying member having a magnetic field generating means stationary therein and carrying a developer on its outer circumferential surface by the magnetic force of the magnetic field generating means, A carrier is disposed close to the latent image carrier, and the proximate portion is positioned between two adjacent different magnetic poles of the magnetic field generating means to form a development region there, and to form a development area therein, to form a development area where magnetic particles and non-magnetic particles are separated. The mixed developer is supported on the outer peripheral surface of the developer carrier by attaching the non-magnetic particles to the surface of the magnetic particles held on the developer carrier by the magnetic force, thereby retaining the latent image. Due to the bias voltage between the body and the developer carrier,
In a method of developing by flying non-magnetic particles onto a latent image carrier, the magnetic particles are formed into an ellipsoidal shape, and lines of magnetic force are formed in a state where the long axis of the magnetic particles is substantially parallel to the outer peripheral surface of the developer carrier. A developing method characterized by: being maintained along.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24995887A JPH0192779A (en) | 1987-10-05 | 1987-10-05 | Developing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24995887A JPH0192779A (en) | 1987-10-05 | 1987-10-05 | Developing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0192779A true JPH0192779A (en) | 1989-04-12 |
Family
ID=17200716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24995887A Pending JPH0192779A (en) | 1987-10-05 | 1987-10-05 | Developing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0192779A (en) |
-
1987
- 1987-10-05 JP JP24995887A patent/JPH0192779A/en active Pending
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