JPS5919969A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPS5919969A JPS5919969A JP13018082A JP13018082A JPS5919969A JP S5919969 A JPS5919969 A JP S5919969A JP 13018082 A JP13018082 A JP 13018082A JP 13018082 A JP13018082 A JP 13018082A JP S5919969 A JPS5919969 A JP S5919969A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- blade
- magnetic
- thickness
- developer
- 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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は現像装置、4!に静電潜像保持体に対し微小間
隔を以て配置した無端状の現像剤保持手段上に、現像剤
(以下、トナーと称す)をトナ一層厚規制手段によって
均一な厚さに塗布し、静電潜像の電界によりトナーを静
電潜像保持手段面に飛行させるジャンピング現像装置に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a developing device, 4! A developer (hereinafter referred to as toner) is applied to a uniform thickness by a toner layer thickness regulating means on an endless developer holding means arranged at a minute distance from the electrostatic latent image holding member, and the electrostatic latent image is The present invention relates to a jumping developing device that causes toner to fly onto a surface of an electrostatic latent image holding means using an electric field of a latent image.
この種のジャンピング現像装置は静電潜像保持手段面と
トナ一層とが非接触の状態で現像を行なうため、地かぶ
りの防止という点で極めて有効である。しかし、使用環
境変化等によりトナー保持手段上のトナー塗布厚さが変
化し、最終的々画像特性に悪影響を与えることがある。This type of jumping developing device performs development in a state where the surface of the electrostatic latent image holding means and the toner layer are not in contact with each other, and is therefore extremely effective in preventing background fog. However, due to changes in the usage environment, etc., the thickness of toner applied on the toner holding means changes, which may ultimately have an adverse effect on image characteristics.
即ち、トナー塗布厚さは高温多湿下においてはトナーの
低抵抗化のため、また、低温低湿下においては強い鏡影
力のために薄い塗布厚さとなってしまう。That is, the toner coating thickness becomes thinner under high temperature and high humidity conditions due to the low resistance of the toner, and under low temperature and low humidity conditions due to the strong specular force.
この塗布厚さの変化を解決する手段としては。As a means to solve this change in coating thickness.
トナー全含む現像ユニットヲ調温して安定環境とするか
、環境変動に応じて通常ブレードと称されるトナ一層厚
規制手段とトナー保持手段との間隙を補正することが考
えられる。しかし、前者は装置の複雑化、後者は精度の
確保からくる補正操作の繁雑キラ夫々招来し、依然実用
の可能性は希薄といわざるを得ない。It is conceivable to adjust the temperature of the developing unit containing all the toner to create a stable environment, or to correct the gap between the toner thickness regulating means, usually called a blade, and the toner holding means in response to environmental changes. However, the former makes the device complicated, and the latter complicates the correction operation due to ensuring accuracy, and it must be said that the possibility of practical use is still low.
本発明は上記に鑑み提案されたもので、簡易な操作によ
り簡便に安定なトナー塗布層が確保できる現像装置を提
供すること全目的とする。The present invention has been proposed in view of the above, and its entire purpose is to provide a developing device that can easily ensure a stable toner coating layer through simple operations.
本発明は上記の目的を達成する手段として、潜像保持体
に対して微小間隔を以て配置した無端状の現像剤保持手
段と、この現像剤保持手段上へ供給された現像剤を均一
り厚さに規制する現像剤層厚規制手段とを備えた現像装
置に於て、中心及び半径の異なる2つの円形曲線ヲ含む
横断面略卵形の形状を有【7.上記2つの円形曲線のう
ち半径の小さ彦円形曲線を上記現像剤保持手段に対向さ
せて該円形曲線の中心を軸に回転可能に軸支した磁性材
を上記現像剤層厚規制手段とすることを特徴とする。As a means for achieving the above object, the present invention includes an endless developer holding means arranged at a minute interval with respect to a latent image holding member, and a developer supplied onto the developer holding means so as to have a uniform thickness. [7. Of the two circular curves, the Hiko circular curve with the smaller radius is opposed to the developer holding means, and a magnetic material is rotatably supported around the center of the circular curve as the developer layer thickness regulating means. It is characterized by
以下1本発明の実施例全図面について説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS All drawings of an embodiment of the present invention will be described below.
1は周面に略叫間隔に複数個の内部磁極2a〜2dを保
持する固定軸で、これ等内部磁極は固定軸の萄全長に亘
って設けられている。3は固定軸1の外側にはめた非磁
性スリーブ(以下、単にスリーブと称す)で、一部を外
部に露出させてホッパ4の側板間に矢示方向に回転自在
に取付は支持されている。5けトナ一層厚規制手段と[
2ての磁性ブレードにして、スリーブ3との間に隙間g
1をあけ且つ内部磁極2bK対向するようにホッパ4の
開口部4aに設けられている。7はホッパ4内に収納し
た磁性トナー、8は不図示の機体に矢示方向に回転自在
に取付は支持でれた潜像保持体にして、これに対し前記
スリーブ6が隙間g2をあけて対向配置されている。Reference numeral 1 denotes a fixed shaft which holds a plurality of internal magnetic poles 2a to 2d at substantially regular intervals on its circumferential surface, and these internal magnetic poles are provided over the entire length of the fixed shaft. Reference numeral 3 denotes a non-magnetic sleeve (hereinafter simply referred to as the sleeve) fitted on the outside of the fixed shaft 1, and is mounted and supported between the side plates of the hopper 4 so as to be rotatable in the direction of the arrow, with a part exposed to the outside. . 5-layer thickness regulation means and [
There is a gap g between the two magnetic blades and the sleeve 3.
1 and is provided in the opening 4a of the hopper 4 so as to face the internal magnetic pole 2bK. 7 is the magnetic toner stored in the hopper 4, 8 is a latent image holding body which is rotatably mounted and supported on a machine body (not shown) in the direction of the arrow; They are placed opposite each other.
上記の構成において、ホッパ4内のトナー7は内部磁極
2CIICより吸引され、矢示方向に回転駆動されるス
リーブろとの接触帯電によるクーロン力で該スリーブに
吸着保持して搬送される。こうして搬送されたトナー7
は磁性ブレード5とこれに対向する内部磁極2bとによ
って磁気剪断力を受け 所用のトナ一層厚に調整された
後、潜像保持体8と対向する現像位置に移送さね1.ト
ナー7は静電潜像の電界作用を受けて潜像保持体面に飛
行してジャンピング現像に供てれる。In the above configuration, the toner 7 in the hopper 4 is attracted by the internal magnetic pole 2CIIC, is attracted and held by the sleeve by the Coulomb force due to contact charging with the sleeve filter which is rotationally driven in the direction of the arrow, and is conveyed. Toner 7 transported in this way
is subjected to magnetic shearing force by the magnetic blade 5 and the internal magnetic pole 2b facing it, and after the toner is adjusted to the desired thickness, it is transferred to the developing position facing the latent image carrier 8. The toner 7 flies to the surface of the latent image carrier under the action of the electric field of the electrostatic latent image and is subjected to jumping development.
第2図は磁性ブレード5によるトナ一層厚規制の原理説
明図であって、磁束密度は磁性ブレードの下端に集中し
ており、内部磁極2bとの間の一ブーブレード間の平衡
点でトナ一層が分割され。FIG. 2 is an explanatory diagram of the principle of regulating the thickness of the toner layer by the magnetic blade 5. The magnetic flux density is concentrated at the lower end of the magnetic blade, and the toner layer is thickened at the equilibrium point between the blades and the internal magnetic pole 2b. is divided.
トナー7はスリーブ3との鏡影力によって該スリーブ表
面に均一薄層に付着するものである。The toner 7 adheres to the sleeve surface in a uniform thin layer due to the mirror force with the sleeve 3.
従って、トラ−1−厚はトナーの荷電状態と磁性ブレー
ドへの磁束密度集中状態によって決定される。環境の変
動などでトナーの荷電が減少しトナ一層のスリーブ6へ
の鏡影力による吸着力が減少すると、トナ一層厚はより
薄くカリ、画像濃度は太きく下落する。この時9画像濃
度即ちトナ一層厚を回復せしめる為には、トナーの荷電
状態の減少に応じて磁性ブレード5への磁束集中を減じ
ればよいことになる。また9反対にトナー荷電の増加に
よってトナ一層厚の増加した場合画像濃度が極端に上が
り9文字や細線がつぶれ、解像力やかぶりの程度も劣悪
化するばかりでなく均一なトナ一層が得られ々くなって
画像に濃度ムラ全土じたりする。この場合は、磁性ブレ
ード5への磁束集中を増加させることによってトナ一層
厚’k 抑制fればよいことに々る。Therefore, the Tora-1 thickness is determined by the charge state of the toner and the state of concentration of magnetic flux density on the magnetic blade. When the charge of the toner decreases due to changes in the environment and the adsorption force of the toner layer due to the mirror image force to the sleeve 6 decreases, the toner layer becomes thinner and the image density decreases sharply. At this time, in order to recover the density of the 9th image, that is, the thickness of the toner, it is sufficient to reduce the concentration of magnetic flux on the magnetic blade 5 in accordance with the decrease in the charged state of the toner. On the other hand, if the thickness of the toner increases due to the increase in toner charge, the image density will rise to an extreme level, characters and fine lines will become flat, the resolution and degree of fog will deteriorate, and it will be difficult to obtain a uniform layer of toner. This results in uneven density throughout the image. In this case, it may be sufficient to further suppress the toner thickness 'k' by increasing the concentration of magnetic flux on the magnetic blade 5.
本発明者が開発、研究を重ねた結果、第6図(a)に示
す如く、磁性ブレード5の下流側に磁束が集中している
場合、磁性ブレード5の上流側は逆に磁束が疎らh状態
とhつで磁性ブレード付近のトナ一層厚規制部へのトナ
ー進入が容易となり、第2図の標準状態に比べ規制部へ
の進入のトナー量が増加する。−また、第6図Φ)に示
す如く磁性ブレード5の上流側に磁束が集中している場
合、トナー7は磁性ブレード5の上流側端にブロッキン
グ層を作り、磁性ブレード付近の規制部へのトナー進入
が抑制され、第2図の標準状態に比べ規制部への進入の
トナー量が減少する。即ち、環境変化に応じて磁束集中
を磁性ブレード5の上流側にするか下流側にすることに
より、常に適正々トナ一層厚とhり画像は安定すること
を見出した。As a result of repeated development and research by the present inventor, as shown in FIG. 6(a), when the magnetic flux is concentrated on the downstream side of the magnetic blade 5, the magnetic flux is sparse on the upstream side of the magnetic blade 5. In state and h, the toner near the magnetic blade becomes easier to enter into the thickness regulating section, and the amount of toner entering the regulating section is increased compared to the standard state shown in FIG. -Also, when the magnetic flux is concentrated on the upstream side of the magnetic blade 5 as shown in FIG. Toner entry is suppressed, and the amount of toner entering the restriction portion is reduced compared to the standard state shown in FIG. That is, it has been found that by shifting the magnetic flux concentration to the upstream side or the downstream side of the magnetic blade 5 depending on environmental changes, the toner thickness can always be properly increased and the image can be stabilized.
本発明は上記の点に着目して、中心及び半径の異なる2
つの円形曲線5a、5b’に含む横断面略卵形の形状を
有する磁性材を磁性ブレード5とい上記2つの円形曲線
のうち半径の小さな円形曲線5bをスリーブろに隙間g
2にあけて対向させ。Focusing on the above points, the present invention has developed two
A magnetic material having a substantially oval cross section included in the two circular curves 5a and 5b' is called a magnetic blade 5. Among the two circular curves, the circular curve 5b with the smaller radius is placed between the sleeve and the gap g.
Open 2 and face each other.
上記円形曲線の中心に通した軸6でホッパ4の側板間に
回転自在に取付は支持したものである。The hopper 4 is rotatably mounted and supported between the side plates of the hopper 4 by a shaft 6 passing through the center of the circular curve.
磁性ブレード5を上記のように構成することにより、磁
性ブレード5の回転角θにかがわらず隙間gl−を常に
一定であす、また、上記回転角が小さい、つオり磁性ブ
レードの傾動角度が小さくても磁束集中を磁性ブレード
5の上流側及び下流側に容易に振り別けることが可能と
なった。By configuring the magnetic blade 5 as described above, the gap gl- is always constant regardless of the rotation angle θ of the magnetic blade 5, and the tilting angle of the magnetic blade when the rotation angle is small is Even if it is small, it is now possible to easily distribute the magnetic flux concentration to the upstream and downstream sides of the magnetic blade 5.
即ち、磁性ブレード5の実質的な磁気容量中心は該磁性
ブレードの手刀にあり、この磁性ブレード5がその回転
中心を通るスリーブ乙の法線上から上流側に回転ζせた
場合、磁束方向が磁性ブレード5全通して」1流側へ曲
げられることにより上流側へ磁束が偏ることによる。That is, the substantial center of magnetic capacity of the magnetic blade 5 is located at the handle of the magnetic blade, and when the magnetic blade 5 is rotated upstream from the normal line of the sleeve B passing through its center of rotation, the direction of magnetic flux becomes magnetic. This is because the magnetic flux is biased toward the upstream side by bending the entire blade 5 toward the first flow side.
第4図に磁性ブ1/−ド5を拡大して示した正面図で9
回転中心側の円形曲線5bの半径Bけ隙間g1.トナ一
種、(al極の強さ等にもよるが、スリーブ表面で60
0ガウス以上の磁束密度を有する磁′1tLVcおいて
隙間g1が3C1Oμ以下の場合、概ね磁極幅t(第2
図)以下が望ましくは2AA以下で良好な結果を得た。Fig. 4 shows an enlarged front view of the magnetic board 1/-5.
Gap g1 with radius B of circular curve 5b on the rotation center side. A type of toner (depending on the strength of the Al pole, etc., 60 on the sleeve surface)
When the gap g1 is 3C1Oμ or less in a magnetic field '1tLVc having a magnetic flux density of 0 Gauss or more, the magnetic pole width t (second
(Figure) Good results were obtained with the following, preferably 2AA or less.
これに対し、実質的々磁気中心全形成する上側の円形曲
線5aの半径Aは上記円形曲線5bの半径Bの1.5倍
以上必要であり9両円形曲線5a、5bの中心間距離は
上記両半径の和の10倍以下が良好であった。On the other hand, the radius A of the upper circular curve 5a that forms substantially the entire magnetic center must be at least 1.5 times the radius B of the circular curve 5b, and the distance between the centers of both circular curves 5a and 5b is as described above. A value of 10 times or less of the sum of both radii was considered good.
本発明は上記の構成であるから、環境変化に応じて磁性
ブレードを回転させ、磁束集中を磁性ブレードの上流側
にするか下流側に選択することにより、スリーブ上のト
ナ一層厚が常に適正に維持し得るものとなり、その結果
、環境変化にかかわらず常に良好な画像が維持できるも
のである。Since the present invention has the above-mentioned configuration, by rotating the magnetic blade according to environmental changes and selecting the magnetic flux concentration to be on the upstream side or the downstream side of the magnetic blade, the thickness of the toner layer on the sleeve can always be maintained at an appropriate level. As a result, a good image can always be maintained regardless of environmental changes.
本発明の現像装置に特に特開昭55−18656〜9号
公報記載の絶縁性−成分トナーを用いるジャンピング現
像法に適用すると良いものであるが。The developing device of the present invention is particularly suitable for use in the jumping developing method using an insulating component toner described in Japanese Patent Laid-Open Nos. 55-18656-9.
トナー稿に応じて規制角(スリーブの接線と磁性ブレー
ドとのなす角度)範囲、磁性ブレード形状。The regulation angle (the angle between the tangent of the sleeve and the magnetic blade) range and the shape of the magnetic blade depend on the toner paper.
規制中(スリーブに対する磁性ブレードの対向幅)を適
宜調整することにより最良のものがそれぞれ得られる。The best results can be obtained by appropriately adjusting the restriction (width of the magnetic blade facing the sleeve).
また、上記構成の磁性ブレードを環境センサーや現像濃
度などのセンサーと結合して傾動制御することにより自
動化も簡単に行なえるものである。Moreover, automation can be easily achieved by controlling the tilting of the magnetic blade having the above structure by combining it with an environmental sensor, a sensor for developing concentration, etc.
第1図は本発明現像装置の実施例を示す概要図。
第2図はスリーブに対するトナ一層厚規制の原理説明図
、第3図(al、(b)は磁性ブレードの回動方向に対
する磁束集中の変化を示す図、第4図は本発明現像装置
に適用する磁性ブレードの拡大正面図である。
3はトナー保持手段としてのスリーブ、5はトナ一層厚
規制手段としての磁性ブレード、7はトナー、8は潜像
保持体。
特許出願人 キャノン株式会社FIG. 1 is a schematic diagram showing an embodiment of the developing device of the present invention. Figure 2 is an explanatory diagram of the principle of regulating the thickness of toner to the sleeve, Figures 3 (al and b) are diagrams showing changes in magnetic flux concentration with respect to the rotating direction of the magnetic blade, and Figure 4 is applied to the developing device of the present invention. 3 is a sleeve as a toner holding means, 5 is a magnetic blade as a toner thickness regulating means, 7 is a toner, and 8 is a latent image holding member. Patent applicant: Canon Co., Ltd.
Claims (1)
像剤保持手段と、この現像剤保持手段上へ供給された現
像剤を均一な厚さに規制する現像剤層厚規制手段とを備
えた現像装置において、中心及び半径の異なる2つの円
形曲線を含む横断面略卵形の形状を有し、上記2つの円
形曲線のうち半径の小さな円形曲線を上記現像剤保持手
段に対向させて該円形曲線の中心を軸に回転可能に軸支
した磁性材ヲ」1記現像剤層厚規制手段とすることを特
徴とする現f象装置。It includes an endless developer holding means arranged at a minute interval with respect to the latent image holding member, and a developer layer thickness regulating means for regulating the developer supplied onto the developer holding means to a uniform thickness. The developing device has a substantially oval cross-sectional shape including two circular curves with different centers and radii, and the circular curve with the smaller radius of the two circular curves is opposed to the developer holding means. 1. A developing device characterized in that the developer layer thickness regulating means is a magnetic material rotatably supported about the center of a circular curve.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13018082A JPS5919969A (en) | 1982-07-26 | 1982-07-26 | Developing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13018082A JPS5919969A (en) | 1982-07-26 | 1982-07-26 | Developing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5919969A true JPS5919969A (en) | 1984-02-01 |
Family
ID=15027963
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13018082A Pending JPS5919969A (en) | 1982-07-26 | 1982-07-26 | Developing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5919969A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5054419A (en) * | 1988-05-09 | 1991-10-08 | Konica Corporation | Image forming apparatus |
-
1982
- 1982-07-26 JP JP13018082A patent/JPS5919969A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5054419A (en) * | 1988-05-09 | 1991-10-08 | Konica Corporation | Image forming apparatus |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4406535A (en) | Development apparatus | |
US4538898A (en) | Developing device | |
US4370049A (en) | Image developing device | |
US4233935A (en) | Magnetic brush apparatus for electrostatic printing system | |
US4334497A (en) | Magnetic brush developing apparatus | |
JPS5919969A (en) | Developing device | |
US4638759A (en) | Magnetic brush apparatus for developing electrostatic images | |
JPS5919970A (en) | Developing device | |
JPH08234567A (en) | Developing device and multicolor image forming device using the same | |
JP2725686B2 (en) | Magnetic brush developing device | |
JPH0635325A (en) | Developing device for electrophotographic printer | |
JPH0220991B2 (en) | ||
JPS62153975A (en) | Developing device | |
JPH0449635Y2 (en) | ||
JPS6034110B2 (en) | magnetic brush developing device | |
JPS55103566A (en) | Developing device | |
JPS5870257A (en) | Developing device | |
JPS60146276A (en) | Developing device by one component magnetic toner | |
JPS60250375A (en) | Developing device | |
JPS56137372A (en) | Developing device | |
JPH10142930A (en) | Developing device | |
JPS60178472A (en) | Dry type developing device | |
JPH0822186A (en) | Developing device | |
JPS61102671A (en) | Developing device and image forming device equipped with developing device | |
JPS57201255A (en) | Method and device for forming toner layer |