JPS5919974A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPS5919974A JPS5919974A JP13067182A JP13067182A JPS5919974A JP S5919974 A JPS5919974 A JP S5919974A JP 13067182 A JP13067182 A JP 13067182A JP 13067182 A JP13067182 A JP 13067182A JP S5919974 A JPS5919974 A JP S5919974A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- developing sleeve
- voltage
- developing
- electrode member
- 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
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
- G03G15/0851—Detection or control means for the developer concentration the concentration being measured by electrical means
Abstract
Description
【発明の詳細な説明】
本発明は、磁性体を含む絶縁性のトナーとキャリヤーか
らなる２成分系の現像剤のトナー濃度を特別のセンサー
を用いることなく簡略に制御することのできるトナー濃
度制御装置を具備した現像装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides toner concentration control that allows the toner concentration of a two-component developer consisting of an insulating toner containing a magnetic material and a carrier to be easily controlled without using a special sensor. The present invention relates to a developing device equipped with a developing device.
従来、導電性の鉄粉等のキャリヤーを用いだ２成分系現
像剤に対するトナー濃度制御装置として、コイルにより
透磁率の変化を測定するもの、ホール素子により磁気抵
抗の変化全測定するもの等がある。これらｒ］１、トナ
ー濃度全検出するのに、コイルやホール素子等のセンサ
ーを用いる為、その設冨場所、ｆ１．能のバラツキ等の
制約を受ける。その他、現像剤の電気抵抗の変化を直接
測定するセンサーを用いないものもある。Conventionally, as toner concentration control devices for two-component developers using carriers such as conductive iron powder, there are devices that measure changes in magnetic permeability using a coil, and devices that measure all changes in magnetic resistance using a Hall element. . These r]1, since a sensor such as a coil or Hall element is used to detect the entire toner concentration, the location where it is installed, f1. Subject to constraints such as variations in performance. Others do not use a sensor that directly measures changes in the electrical resistance of the developer.
しかし、本発明による磁性体を含む絶縁性のトナーとキ
ャリート−からなる２成分系現像剤に対しては、電気数
１ノ“１．の変化によるトナー濃度制御装置では、トナ
ー濃１ｗの測定精度が悪く、制御が困難である。However, for a two-component developer consisting of an insulating toner containing a magnetic material and a carry toner according to the present invention, the toner density control device based on a change in electrical number 1 has a measurement accuracy of 1W of toner density. is difficult to control.
本発明は、磁性体を含む絶縁性のトナーとキャリヤーか
らなる２成分系現像剤を用いた現像装置に関し、簡略な
構成により、トナー濃度を検出し一定の濃度に制御しう
るトナー濃度制御装置を有する現像装置全１星供するも
のである。The present invention relates to a developing device using a two-component developer consisting of an insulating toner containing a magnetic material and a carrier, and a toner concentration control device that can detect the toner concentration and control it to a constant concentration with a simple configuration. A total of one developing device is provided.
以下、図面を参照して本発明の詳細な説明する。Hereinafter, the present invention will be described in detail with reference to the drawings.
第１図は本発明のトナー濃度制御装置全具備した現像装
置の一実施例の内部構造の概略を示した断面図である。FIG. 1 is a sectional view schematically showing the internal structure of an embodiment of a developing device fully equipped with the toner density control device of the present invention.
同図において、感光体１は、表面感光層がセレンテルル
よりなるもので、周速度が１５０” ／ ｓｅｅで矢印
Ａ方向に回転している。現像装置２の現像スリーブ３は
非磁性体製で、矢印Ｂ方向に１５Ｏｒｐｍの速度で回転
し、その内部に配設されたマグネットロール４は矢印Ｃ
方向に１５０Ｏｒｐｍ の速度で回転して、現像剤５
の攪拌を行っている。現像装置２内の現像剤６は、１０
μｍ径の磁性体を含む絶縁性トナーと、４０μｍ径の磁
性体を含む絶縁性キャリヤーの混合物から成っている。In the figure, the photoreceptor 1 has a surface photosensitive layer made of selenium tellurium, and is rotating in the direction of arrow A at a circumferential speed of 150''/see.The developing sleeve 3 of the developing device 2 is made of a non-magnetic material. The magnet roll 4 rotates in the direction of arrow B at a speed of 15 Orpm, and the magnet roll 4 disposed inside rotates in the direction of arrow B.
The developer rotates at a speed of 150 rpm in the
stirring is performed. The developer 6 in the developing device 2 is 10
It consists of a mixture of an insulating toner containing a magnetic material with a diameter of .mu.m and an insulating carrier containing a magnetic material with a diameter of 40 .mu.m.
現像剤５は現像スリーブ３の周面を、その現像スリーブ
３の回転方向と同方向に搬送される。一方、現像スリー
ブ３には現像バイアス電源６から所定のバイアス電圧ｖ
ｑが印加されており、その極性は、感光体の静電潜像の
電位と同極性である。The developer 5 is conveyed along the circumferential surface of the developing sleeve 3 in the same direction as the rotating direction of the developing sleeve 3. On the other hand, the developing sleeve 3 is supplied with a predetermined bias voltage v from the developing bias power supply 6.
q is applied, and its polarity is the same as the potential of the electrostatic latent image on the photoreceptor.
現像スリーブ３の外周近傍には０．５ ｍＮの間隔で電
極部材７が現像スリーブ３の回転軸心に平行して設けら
れている。この電極部材７は現像剤の穂立高さを規制す
る機能全有するブレードであって、磁性体材料よりなっ
ている。まだ、上記電極部材７は、抵抗８とコンデンサ
９全通して接地されている。上記抵抗８の両端には、電
流による電圧Ｖが発生し、この電圧Ｖは制却回路１０に
入力される。制御回路１ｏにおいて上記電圧Ｖは基準電
圧Ｖｓ と比較され、基準電圧以下になると、ホッパー
１１の下部にあるトナー補給ローラ１２に連結されてい
るモータ１３を一定の回転数たけ回してトナー１４を現
像装置２の中に落下きせるようになっている。なお、１
５は帯電用コロトロン、１６は転写用コロトロン、１７
は紙分離用コロトロン、１８はコピー紙である。Near the outer periphery of the developing sleeve 3, electrode members 7 are provided parallel to the rotational axis of the developing sleeve 3 at intervals of 0.5 mN. This electrode member 7 is a blade having the full function of regulating the spike height of the developer, and is made of a magnetic material. The electrode member 7 is still grounded through the resistor 8 and capacitor 9. A voltage V due to the current is generated across the resistor 8, and this voltage V is input to the control circuit 10. In the control circuit 1o, the voltage V is compared with a reference voltage Vs, and when it becomes lower than the reference voltage, the motor 13 connected to the toner replenishing roller 12 at the bottom of the hopper 11 is rotated a certain number of revolutions to develop the toner 14. It is designed so that it can be dropped into the device 2. In addition, 1
5 is a corotron for charging, 16 is a corotron for transfer, 17
1 is a corotron for paper separation, and 18 is copy paper.
ココテ、上記？ｌＪ’、圧Ｖを検出するタイミングは、
制御回路１ｏにｊ：り静電潜像の非画像部、具体的には
、原稿の光学スキャン以外の部分で、感光体の表面電位
がイレー→ノ“により一定値に下カっている部分全現像
している時とする。なせならば、・電圧Ｖの値が画像部
と非画像部全現像している時で異なり、特に黒ベタ全現
像する時の差が大きいので、非画像部を現像している時
に検出し、画像の差による影響ヲ々くし、精度を上げる
為である。Cocote, above? The timing to detect lJ' and pressure V is
In the control circuit 1o, there is a non-image part of the electrostatic latent image, specifically, a part other than the optical scanning of the original, where the surface potential of the photoreceptor has fallen to a constant value due to the erase. The value of voltage V is different when the image area and the non-image area are fully developed, and the difference is especially large when the black solid area is fully developed. This is to detect the image during development, eliminate the influence of image differences, and improve accuracy.
現像バイアス電圧Ｖｑ ｋ、画像濃度を変化させる為に
可変する場合には、電圧Ｖが変化するので、検出するタ
イミング中、制御回路１０により一定の現像バイアス電
圧に切替えることが望ましい。When the developing bias voltage Vqk is varied to change the image density, the voltage V changes, so it is desirable to switch to a constant developing bias voltage by the control circuit 10 during the detection timing.
第２図は、現像剤のトナー濃度と、電圧Ｖとの関係を示
したもので、トナー濃度が６％から１０９６の範囲で比
例している。この比例領域で、トナー濃度が一定になる
様に制御を行うものである。FIG. 2 shows the relationship between the toner concentration of the developer and the voltage V, and the toner concentration is proportional within the range of 6% to 1096%. Control is performed so that the toner concentration remains constant in this proportional region.
次に、本発明におけるトナー濃度制御の原理について第
３図を参照して説明する。Next, the principle of toner density control in the present invention will be explained with reference to FIG.
電極部材７と現像スリーブ３間には、現像バイアス電圧
ｖｑ による電界と、マグネットロール４と磁性体製の
電極部材７による磁界が形成されている。その間を帯電
した磁性トナーと磁性キャリヤーからなる現像剤５が磁
界に沿って並びながら、現像スリーブ３の周方向に移動
する。磁性トナーと磁性キャリヤーが電極部材７を通り
過ぎる時、電極部材７への吸着から離れて、磁性トナー
が現像スリーブ３面・＼吸着することにより電荷移動が
生じ、電極部材７と現像スリーブ３間に電流が流れる。An electric field due to the developing bias voltage vq and a magnetic field due to the magnet roll 4 and the electrode member 7 made of a magnetic material are formed between the electrode member 7 and the developing sleeve 3. A developer 5 made of charged magnetic toner and a magnetic carrier moves in the circumferential direction of the developing sleeve 3 while being lined up along the magnetic field. When the magnetic toner and magnetic carrier pass through the electrode member 7, the magnetic toner leaves the electrode member 7 and is attracted to the surface of the developing sleeve 3, causing a charge transfer, and a charge is transferred between the electrode member 7 and the developing sleeve 3. Current flows.
従って、この電流値は、現像スリーブ３の回転による現
像剤の脹送速度に比例している。磁性体製の電極部桐７
とマグネノｌ−ロール４を内部に含む現像スリーブ３間
では、磁界が生じている為、マグネットロール４の回転
による現像剤の搬送および、現像剤の穂の回転による攪
拌は生じず、それに起因する電流は流れていない。Therefore, this current value is proportional to the developer inflation speed due to the rotation of the developing sleeve 3. Magnetic electrode part paulownia 7
Since a magnetic field is generated between the developing sleeve 3 and the developing sleeve 3 containing the Magneno L-roll 4 therein, the developer is not conveyed by the rotation of the magnet roll 4, nor is agitated by the rotation of the ears of the developer. No current is flowing.
また、電流値は、現像バイアス電圧による電界およびト
ナー濃）現に比例しており、トナーの現像スリーブ３面
への静電吸着が電流値に関係している。Further, the current value is proportional to the electric field due to the developing bias voltage and the toner density, and the electrostatic attraction of the toner to the surface of the developing sleeve 3 is related to the current value.
したがって、磁性体全台む絶縁性のトナーとキャリヤー
からなる２成分系の現像剤に対し、磁性体製の電極部材
７からの電流全測定することにより、トナー濃度全検出
し、一定の濃度となるように制御することができる。Therefore, by measuring the total current from the magnetic electrode member 7 for a two-component developer consisting of an insulating toner and a carrier, which is entirely composed of magnetic materials, the total toner concentration can be detected, and the toner concentration can be maintained at a constant level. It can be controlled so that
以上のように本発明は非常に簡単な構成で、トナー濃度
全確実に検出し、一定のトナー濃度となるように制御し
うるもので、その効果は非常に大なるものがある。As described above, the present invention has a very simple configuration, can reliably detect the toner concentration, and can control the toner concentration to a constant level, and has a very large effect.
第１図は本発明の一実施例の概略構成図、第２図はトナ
ー濃度と測定電圧との関係を示す特性図、第３図は本発
明における電流検出の原理を説明するだめの（既安図−
Ｃある。
１・・・・・・感）Ｙ４体、２・・・・・・現像装置、
３・・・・・・現像スリーブ、４・・・・マグネットロ
ール、５・・・・・・現像剤、６・・・・・・現像・・
イアスミ源、７・・・・・・電極部材、８・・・・・・
ｔＪｆ、抗、９・・・・・・コンデンサ、１０・・・・
・・制御回路、１１ ・・・・ホノハ−１１２・・・・
・・トナー補給ローラ、１３・ ・・モータ、１４・・
・・トナー。FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, FIG. 2 is a characteristic diagram showing the relationship between toner concentration and measurement voltage, and FIG. 3 is a diagram illustrating the principle of current detection in the present invention. Anzu-
There is C. 1... feeling) Y4 body, 2... developing device,
3...Development sleeve, 4...Magnet roll, 5...Developer, 6...Development...
Iasumi source, 7... Electrode member, 8...
tJf, anti, 9... capacitor, 10...
・・Control circuit, 11 ・・Honoha-112・・・・
...Toner supply roller, 13...Motor, 14...
··toner.
Claims (1)
設され／こマグネットロールの両方が回転するように構
成され、かつ、磁性体を含む絶縁性のトナーとキャリヤ
ーからなる２成分系の現像剤を用い、前記現像スリーブ
の外周に近接して設けた磁性体製の電極部材と前記現像
スリーブ間を現像剤が現像スリーブの周方向に移動する
ことによる電極部材からの電流全測定し、その値が一定
の値になる様にトナーの補給を行って前記２成分系の現
像剤のトナー濃度が一定になる様に制御するように構成
したトナー濃度制御装置を具備してなることを特徴とす
る現像装置。 （２）現像スリーブとマグネットロールの回転方向を異
なら氾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。 （３）電流を測定するタイミングを静電潜像の非画像部
を現像している間とする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。 （４）電流全測定するタイミングにおいて現像スリーブ
に印加する電圧値を切替えることを特徴とする特許請求
の範囲第（３）項記載の現像装置。 （６）電極部材が現像剤の穂立高さを規制する機能を持
つ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。 （６）現像スリーブが非磁性体であること全特徴とする
特許請求の範囲第（１）項記載の現像装置。[Scope of Claims] (1) A developing sleeve to which a voltage is applied and a magnet roll disposed inside the developing sleeve, both of which rotate, and which contain insulating toner and carrier containing a magnetic material. A two-component developer is used, and the developer moves in the circumferential direction of the developing sleeve between an electrode member made of a magnetic material provided close to the outer periphery of the developing sleeve and the developing sleeve. and a toner concentration control device configured to control the toner concentration of the two-component developer to be constant by measuring the total current of and replenishing toner so that the value becomes a constant value. A developing device characterized by: (2) The developing device according to claim (1), wherein the developing sleeve and the magnet roll rotate in different directions. (3) The developing device according to claim (1), wherein the timing for measuring the current is while a non-image area of the electrostatic latent image is being developed. (4) The developing device according to claim (3), characterized in that the voltage value applied to the developing sleeve is switched at the timing of measuring the entire current. (6) The developing device according to claim (1), wherein the electrode member has a function of regulating the spike height of the developer. (6) The developing device according to claim (1), wherein the developing sleeve is made of a non-magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13067182A JPS5919974A (en) | 1982-07-26 | 1982-07-26 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13067182A JPS5919974A (en) | 1982-07-26 | 1982-07-26 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5919974A true JPS5919974A (en) | 1984-02-01 |
Family
ID=15039827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13067182A Pending JPS5919974A (en) | 1982-07-26 | 1982-07-26 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5919974A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60263178A (en) * | 1984-06-01 | 1985-12-26 | ゼロツクス コーポレーシヨン | Apparatus for detecting existence of toner particle |
| JPS63208885A (en) * | 1987-02-26 | 1988-08-30 | Canon Inc | Image forming device |
| JPH04282668A (en) * | 1991-03-12 | 1992-10-07 | Mita Ind Co Ltd | Image forming device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53119049A (en) * | 1977-03-26 | 1978-10-18 | Konishiroku Photo Ind Co Ltd | Detecting and controlling method of toner contents in developer and device for the same |
| JPS5420741A (en) * | 1977-07-18 | 1979-02-16 | Hitachi Ltd | Toner concentration detector |
| JPS5579474A (en) * | 1978-12-13 | 1980-06-14 | Canon Inc | Concentration detecting method of developer |
| JPS5760359A (en) * | 1980-09-27 | 1982-04-12 | Minolta Camera Co Ltd | Magnetic brush developing device |
-
1982
- 1982-07-26 JP JP13067182A patent/JPS5919974A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53119049A (en) * | 1977-03-26 | 1978-10-18 | Konishiroku Photo Ind Co Ltd | Detecting and controlling method of toner contents in developer and device for the same |
| JPS5420741A (en) * | 1977-07-18 | 1979-02-16 | Hitachi Ltd | Toner concentration detector |
| JPS5579474A (en) * | 1978-12-13 | 1980-06-14 | Canon Inc | Concentration detecting method of developer |
| JPS5760359A (en) * | 1980-09-27 | 1982-04-12 | Minolta Camera Co Ltd | Magnetic brush developing device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60263178A (en) * | 1984-06-01 | 1985-12-26 | ゼロツクス コーポレーシヨン | Apparatus for detecting existence of toner particle |
| JPH0581038B2 (en) * | 1984-06-01 | 1993-11-11 | Xerox Corp | |
| JPS63208885A (en) * | 1987-02-26 | 1988-08-30 | Canon Inc | Image forming device |
| JPH04282668A (en) * | 1991-03-12 | 1992-10-07 | Mita Ind Co Ltd | Image forming device |
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