JPS5854385B2 - Electrostatic latent image developing device - Google Patents
Electrostatic latent image developing deviceInfo
- Publication number
- JPS5854385B2 JPS5854385B2 JP14278775A JP14278775A JPS5854385B2 JP S5854385 B2 JPS5854385 B2 JP S5854385B2 JP 14278775 A JP14278775 A JP 14278775A JP 14278775 A JP14278775 A JP 14278775A JP S5854385 B2 JPS5854385 B2 JP S5854385B2
- Authority
- JP
- Japan
- Prior art keywords
- latent image
- electrostatic latent
- developer
- sleeve
- 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.)
- Expired
Links
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は静電潜像現像装置、詳しくは磁性キャリアとト
ナーと称する着色粉体微粒子とからなる二成分現像方式
による静電潜像現像装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic latent image developing device, and more particularly to an electrostatic latent image developing device using a two-component developing system consisting of a magnetic carrier and colored powder particles called toner.
一般に、上記二成分現像方式はカスケード式と磁気ブラ
シ式とに大別されるが、両者はともに相反する長所と短
所とを有している。In general, the above two-component development methods are broadly classified into a cascade method and a magnetic brush method, but both have contradictory advantages and disadvantages.
すなわち、カスケード式は線像の再現に効果的である反
面、面積像の再現が不可能であり階調性をもつ写真等の
複写には全く使用できない。That is, while the cascade type is effective in reproducing line images, it cannot reproduce area images and cannot be used at all for copying photographs with gradation.
また、現像剤をパケットで感光体の現像領域の上部にい
ったん搬送してから該現像領域に流下させるために、装
置自体の小形化が困難であるとともに、流下の際に生じ
るトナー粉煙およびキャリヤの飛散に十分な対策が必要
とされる。In addition, because the developer is transported in packets to the upper part of the developing area of the photoreceptor and then allowed to flow down into the developing area, it is difficult to miniaturize the device itself, and the toner powder smoke and carrier that are generated when the developer is flowed down. Sufficient measures are required to prevent the scattering of
一方、磁気ブラシ式は面積像の再現は可能であり、装置
の小形化が容易である反面、複写画像にスジ模様が発生
しその画質は満足できるものではない。On the other hand, although the magnetic brush type is capable of reproducing an area image and the apparatus can be easily miniaturized, on the other hand, streaks appear in the copied image and the image quality is not satisfactory.
これは、スリーブ内に設置した固定磁石の磁場で形成さ
れる現像剤のブラシが硬く、現像時に感光体上の静電潜
像面をこするために生じる。This occurs because the developer brush formed by the magnetic field of the fixed magnet installed in the sleeve is hard and scrapes the electrostatic latent image surface on the photoreceptor during development.
したがって、スジのない滑かな画質を得るには、磁場を
弱めて柔らかなブラシとすることが考えられるが、この
方法によれば磁場によるキャリアの保持が弱くなるので
、潜像電位が高い場合は分極力によって感光体へキャリ
アが付着し、画質が損われることはもちろん、他のプロ
セスである転写部、清掃部、定着部に障害が発生し、好
ましいものではない。Therefore, in order to obtain smooth image quality without streaks, it is possible to weaken the magnetic field to create a soft brush, but this method weakens the retention of carriers by the magnetic field, so if the latent image potential is high, The polarization force causes carriers to adhere to the photoreceptor, which not only impairs image quality but also causes trouble in other processes such as a transfer section, a cleaning section, and a fixing section, which is not desirable.
また、線像の再現においても上記理由により決して満足
するものではない。Further, the reproduction of line images is also not satisfactory for the reasons mentioned above.
さらに、十分な画像濃度を得るためには、現像剤中のト
ナー濃度をキャリアに対する重量比で数％として、カス
ケード式におけるトナー濃度である１％前後と比べて高
くしなげればならず、トナー補給、現像剤の攪拌混合を
十分に行わなければならないために、現像に寄与しない
いわゆるスペントトナーが発生しやすく、現像剤の耐久
性を弱めている。Furthermore, in order to obtain sufficient image density, the toner concentration in the developer must be several percent by weight relative to the carrier, which is higher than the toner concentration in the cascade system, which is around 1%. Since the developer must be sufficiently replenished and agitated and mixed, so-called spent toner, which does not contribute to development, is likely to be generated, weakening the durability of the developer.
本発明は上記の欠点に鑑みてなされたもので、その目的
は装置の小形化を図るとともに低い１・す濃度で高濃度
の画像を得て、線像および面積像の忠実で質のよい画像
とすることができ、かつ高速現像にも適した静電潜像現
像装置を提供することにある。The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to reduce the size of the apparatus, obtain high-density images with low 1.S density, and obtain faithful and high-quality images of line images and area images. It is an object of the present invention to provide an electrostatic latent image developing device that can perform the following steps and is also suitable for high-speed development.
以下、本発明を一実施例である添付図面にしたがって説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are exemplary embodiments.
１は現像剤タンクで、一側部は図中時計回り方向に回転
可能な感光体ドラム７の現像領域７ａに向って開口して
いる。Reference numeral 1 denotes a developer tank, one side of which is open toward a developing area 7a of a photosensitive drum 7 that is rotatable in the clockwise direction in the figure.
２は導電材からなるスリーブで、上記現像剤タンク１内
の中央部に感光体ドラム７の現像領域７ａＫ近接してか
つ図中反時計回り方向にすなわち現像領域７ａにおいて
は感光体ドラム７と同方向に回転可能に設置され、電気
的には潜像電荷と同極性のバイアス電圧を印加される。Reference numeral 2 denotes a sleeve made of a conductive material, which is located close to the developing area 7aK of the photoreceptor drum 7 in the central part of the developer tank 1 and extends counterclockwise in the figure, that is, in the same manner as the photoreceptor drum 7 in the developing area 7a. It is installed so as to be rotatable in the direction, and is electrically applied with a bias voltage having the same polarity as the latent image charge.
３ａ、３ｂｔ３ｃは永久磁石で、スリーブ２内の軸方向
に固定した支持棒４の外周部に、それぞれ上記現像領域
７ａと対向しない方向に位置して取付けられている。Permanent magnets 3a and 3bt3c are attached to the outer circumference of the support rod 4 fixed in the axial direction within the sleeve 2, respectively, in a direction that does not face the developing area 7a.
５はブレードで、現像剤タンク１の天井部に設置され、
先端部はスリーブ２の上部に近接して位置している。5 is a blade installed on the ceiling of the developer tank 1;
The tip is located close to the top of the sleeve 2.
８はトナー補給タンクで、底部には現像剤タンク１の開
口１ａに臨むトナー補給ロール９が図中時計回り方向に
回転可能に設置され、トナー１０はロール９の回転によ
り現像剤タンク１内に補給される。Reference numeral 8 denotes a toner replenishment tank, and a toner replenishment roll 9 facing the opening 1a of the developer tank 1 is installed at the bottom so as to be rotatable in the clockwise direction in the figure. will be replenished.
以上の構成からなる現像装置において、開口１ａから現
像剤タンク１内に補給されたトナー１０は、スリーブ２
０反時計回り方向への回転にもとづいて、まず永久磁石
３ａの磁界の作用で、磁気ブラシ式に使用する鉄粉より
直径の大きい磁性キャリアと攪拌混合され、両者の相互
摩擦によりトナーは正に帯電し、負に帯電したキャリア
に静電的に吸着して現像剤１１を構成する。In the developing device configured as described above, the toner 10 replenished into the developer tank 1 through the opening 1a is transferred to the sleeve 2.
0 Based on the counterclockwise rotation, first, by the action of the magnetic field of the permanent magnet 3a, the toner is stirred and mixed with a magnetic carrier whose diameter is larger than that of the iron powder used in the magnetic brush type, and due to mutual friction between the two, the toner is The developer 11 is formed by being electrostatically charged and electrostatically adsorbed to the negatively charged carrier.
この現像剤１１は永久磁石３ｂの磁界に拘束されてスリ
ーブ２０回転とともに反時計回り方向に搬送され、フレ
ード５で搬送量を規制されたのち、スリーブ２と感光体
ドラム７との間隙の上方に位置する現像剤溜め６にまで
搬送され、永久磁石３ｂの磁界による拘束力を解除され
る。This developer 11 is restrained by the magnetic field of the permanent magnet 3b and is conveyed counterclockwise as the sleeve 20 rotates, and after the amount of conveyance is regulated by the flade 5, it is transported above the gap between the sleeve 2 and the photoreceptor drum 7. The developer is transported to the developer reservoir 6 located at the developer reservoir 6, and the restraining force caused by the magnetic field of the permanent magnet 3b is released.
現像剤溜め６にいったん溜められた現像剤１１は感光体
ドラム７の現像領域７ａを流下し、あらかじめ感光体ド
ラムγ上に形成された静電潜像を現像する。The developer 11 once stored in the developer reservoir 6 flows down the development area 7a of the photoreceptor drum 7, and develops the electrostatic latent image previously formed on the photoreceptor drum γ.
このとき、スリーブ２には上述のようにバイアス電圧が
印加され、スリーブ２は現像電極として機能する。At this time, the bias voltage is applied to the sleeve 2 as described above, and the sleeve 2 functions as a developing electrode.
上記現像を終えた現像剤１１は永久磁石３ｃの磁界に拘
束されて永久磁石３ａの方向に搬送されるとともに、新
たなトナー１０を補給され、上記同様の現像工程を繰り
返す。The developer 11 that has completed the development is conveyed in the direction of the permanent magnet 3a while being restrained by the magnetic field of the permanent magnet 3c, and is replenished with new toner 10, and the same development process as described above is repeated.
上記現像工程において、現像剤１１を現像剤溜め６にい
ったん溜めるには、スリーブ２とブレード５との間隙ｄ
ｄ およびスリーブ２と感光体ドラム７との間隙ｄｓ
の相関関係に影響され、ｄｓ が太きければ当然ｄｄ
も大きくしなげればならない。In the above development process, in order to temporarily store the developer 11 in the developer reservoir 6, the gap d between the sleeve 2 and the blade 5 must be
d and the gap ds between the sleeve 2 and the photosensitive drum 7
If ds is thick, naturally dd
must also be made larger.
本発明者の実験によれば、１．５關のｄｓ に対してｄ
ｄを２．３關とし、スリーブ２の直径が６０１ｒＬ７／
ＬＳ回転数が１６Ｏｒｐｍ、感光体ドラム７の直径が１
００ｍｍ、周速度が１０ＣｒＩＬ／ｓで、良好な結果が
得られた。According to the inventor's experiments, for ds of 1.5 degrees, d
d is 2.3 degrees, and the diameter of sleeve 2 is 601rL7/
The LS rotation speed is 16 Orpm, and the diameter of the photosensitive drum 7 is 1
00 mm and a peripheral speed of 10 CrIL/s, good results were obtained.
すなわち、本発明は１個のスリーブ２の内部に感光体ド
ラム７の現像領域７ａと対向しない永久磁石３ａ 、３
ｂ 、３ｃを設けて現像剤１１を攪拌混合および搬送し
、現像剤１１は永久磁石３ｂの磁界の拘束から解除され
た状態でいったん現像剤溜め６に溜められたのち現像領
域７ａを流下してカスケード現像を行うようにしたため
に、装置自体は極めて小形化され、現像剤中のトナー濃
度は磁気ブラシ式に比べて低濃度となり、線像はもちろ
ん面積像の再現も可能であり、複写画像にスジが発生す
ることはなく満足できる画質を得ることができ、高速現
像も可能である。That is, in the present invention, permanent magnets 3a, 3 that do not face the developing area 7a of the photoreceptor drum 7 are provided inside one sleeve 2.
b and 3c are provided to stir, mix, and transport the developer 11, and the developer 11 is released from the restraint of the magnetic field of the permanent magnet 3b and is temporarily stored in the developer reservoir 6, and then flows down the development area 7a. Because cascade development is carried out, the device itself is extremely compact, and the toner concentration in the developer is lower than that of the magnetic brush type, making it possible to reproduce not only line images but also area images. Satisfactory image quality can be obtained without streaks, and high-speed development is also possible.
しかも、スリーブ２は導電材で形成されバイアス電圧を
印加されるため、現像電極としても機能し、より装置自
体の小形化を図ることができるとともに、別体の現像電
極を設けることによる現像剤１１の流下を妨げるという
欠点を除去できる。In addition, since the sleeve 2 is made of a conductive material and a bias voltage is applied, it also functions as a developing electrode, making it possible to further reduce the size of the device itself. The disadvantage of obstructing the flow of water can be eliminated.
さらに、上述のごとく現像剤溜め６を設けたために、現
像領域７ａが実質的に広がって現像効率が向上するばか
りか、現像剤１１の流下時に発生するトナー粉煙は現像
剤溜め６で吸収されるので、殊更トナー粉煙対策を施さ
なくてもよい。Furthermore, since the developer reservoir 6 is provided as described above, not only the developing area 7a is substantially expanded and development efficiency is improved, but also the toner powder smoke generated when the developer 11 flows down is absorbed by the developer reservoir 6. Therefore, there is no need to take any special measures against toner powder smoke.
換言すれば、本発明は磁気ブラシ式の長所のみをとり入
れてカスケード式の短所を除去した静電潜像現像装置で
ある。In other words, the present invention is an electrostatic latent image developing device that incorporates only the advantages of the magnetic brush type and eliminates the disadvantages of the cascade type.
第１図は本発明にかかる静電潜像現像装置の断面図、第
２図は現像剤の動きを小す断面図である。
２・・・・・・スリーブ、３ａ
石、６・・・・・・現像剤溜め、
７ａ・・・・・・現像領域。
、３ｂ、３ｃ・・・・・・永久値
Ｉ・・・・・・感光体ドラム、FIG. 1 is a sectional view of an electrostatic latent image developing device according to the present invention, and FIG. 2 is a sectional view showing a method for reducing the movement of developer. 2...Sleeve, 3a Stone, 6...Developer reservoir, 7a...Development area. , 3b, 3c... permanent value I... photosensitive drum,
Claims (1)
担体上にあらかじめ形成された静電潜像に接触させるこ
とにより、該静電潜像を現像するようにした静電潜像現
像装置において、導電材からなるとともに上記静電潜像
担体の現像領域に近接してかつ該現像領域に回転可能に
設置され、バイアス電圧を印加されたスリーブと、該現
像スリーブの回転にもとづいて現像剤を上記静電潜像担
体とスリーブとの間隙の上方まで搬送していったん溜め
たたのち、該間隙に流下させて上記静電潜像担体上に形
成された静電潜像を現像するように上記スリーブ内に現
像領域と対向しない位置に設置された磁石とを備えたこ
とを特徴とする静電潜像現像装置。1. In an electrostatic latent image developing device that develops an electrostatic latent image formed in advance on an electrostatic latent image carrier by bringing a developer consisting of a magnetic carrier and toner into contact with the electrostatic latent image. , a sleeve made of a conductive material, rotatably installed in the vicinity of and rotatably in the development area of the electrostatic latent image carrier, and to which a bias voltage is applied; The electrostatic latent image carrier is conveyed to above the gap between the electrostatic latent image carrier and the sleeve, and then allowed to flow down into the gap to develop the electrostatic latent image formed on the electrostatic latent image carrier. An electrostatic latent image developing device characterized by comprising a magnet installed in a sleeve at a position not facing a developing area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14278775A JPS5854385B2 (en) | 1975-11-29 | 1975-11-29 | Electrostatic latent image developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14278775A JPS5854385B2 (en) | 1975-11-29 | 1975-11-29 | Electrostatic latent image developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5266438A JPS5266438A (en) | 1977-06-01 |
| JPS5854385B2 true JPS5854385B2 (en) | 1983-12-05 |
Family
ID=15323584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14278775A Expired JPS5854385B2 (en) | 1975-11-29 | 1975-11-29 | Electrostatic latent image developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5854385B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60110584A (en) * | 1983-11-17 | 1985-06-17 | 三洋電機株式会社 | Generating set for bicycle |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5895370A (en) * | 1981-12-01 | 1983-06-06 | Sharp Corp | Developing device |
| JPS6087353A (en) * | 1983-10-19 | 1985-05-17 | Canon Inc | Formation of thin layer of developer |
| JP2500912B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotographic equipment |
| JP2500905B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Image forming device |
| JP2500911B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotographic equipment |
| JP2500910B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotographic equipment |
| JP2500915B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotography method |
| JP2500908B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Image forming device |
| JP2500909B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotography method |
| JP2500913B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotographic equipment |
| JP2500904B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotographic equipment |
| JP2500903B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotographic equipment |
| JP2500907B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotographic equipment |
| JP2500902B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotographic equipment |
| JP2500906B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Image forming device |
| JP2500914B2 (en) * | 1993-06-30 | 1996-05-29 | 松下電器産業株式会社 | Electrophotographic equipment |
-
1975
- 1975-11-29 JP JP14278775A patent/JPS5854385B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60110584A (en) * | 1983-11-17 | 1985-06-17 | 三洋電機株式会社 | Generating set for bicycle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5266438A (en) | 1977-06-01 |
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