JPS5990871A - Controlling method of potential of electrophotographic sensitive body - Google Patents
Controlling method of potential of electrophotographic sensitive bodyInfo
- Publication number
- JPS5990871A JPS5990871A JP20072782A JP20072782A JPS5990871A JP S5990871 A JPS5990871 A JP S5990871A JP 20072782 A JP20072782 A JP 20072782A JP 20072782 A JP20072782 A JP 20072782A JP S5990871 A JPS5990871 A JP S5990871A
- Authority
- JP
- Japan
- Prior art keywords
- potential
- pencil
- potentials
- photoreceptor
- photosensitive body
- 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
- G03G15/065—Arrangements for controlling the potential of the developing electrode
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrophotography Using Other Than Carlson'S Method (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は電子写真法において常に安定した画像を得るた
めに電子写真感光体上の静電潜像の電位を自動的に制御
する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically controlling the potential of an electrostatic latent image on an electrophotographic photoreceptor in order to always obtain a stable image in electrophotography.
電子写真法に於て、コピー画像の画質を安定化するため
に、コピー動作前に通常の潜像形成ザイクルにより感光
体上にモデル電位として完全非露光部(暗部市7位)と
完全露光部(明部電位)とを形成し、それらの電位を電
位センサで検知し、これらの検知信号に基づいて演算後
、感光体の帯電量を変化させて暗部%1位と明部t4.
位を夫々の目標値に近づけるように制御する方法が知ら
れている。In electrophotography, in order to stabilize the image quality of the copied image, before the copying operation, a normal latent image formation cycle is used to create a model potential on the photoreceptor in completely unexposed areas (7th place in Dark City) and completely exposed areas. (bright area potential), these potentials are detected by a potential sensor, and after calculation based on these detection signals, the amount of charge on the photoreceptor is changed to obtain dark area %1 and bright area t4.
There is a known method for controlling the positions so that they approach their respective target values.
しかし、このように暗部%、位と明部電位とを所定値に
制御した場合、感光体の感度特性により第1図の様に種
々の露光量−電位カーブ(E=Vカーブ)が得られる。However, if the dark area %, level and bright area potential are controlled to predetermined values in this way, various exposure amount-potential curves (E=V curves) can be obtained depending on the sensitivity characteristics of the photoreceptor as shown in Figure 1. .
従ってそれぞれに対して中間部階調(灰色部)の画質が
異々つでしまう。Therefore, the image quality of the intermediate gradation (gray part) differs for each.
本発明は、安定した1IIll像を得るだめの感光体電
位制御方法において、特に一般に多く用いられる印刷及
びタイプ原稿等に対応する暗部電位と鉛筆原稿等の中間
階調部に対応する電位を安定させることを目的とするも
ので、本発明の感光体電位制御方法の特徴とする所は、
感光体に−・次帯電、二次帯電同時像露光及び全面露光
からなるプロセスにより静電潜像を形成する霜、子写真
法において、コピー動作開始前に完全非露光部に相癲す
る電位(暗部電位)及び鉛筆書き部などの中間階調部(
反射濃度0.3〜0.5)に相当する電位をモデル電位
として感光体上に形成し、これら電位を電位センサで検
知して夫々の目標値に近づけるように一次帯電及び二次
帯電の電流値を制御することにある。In a photoreceptor potential control method for obtaining a stable 1IIIll image, the present invention particularly stabilizes the dark area potential corresponding to commonly used printing and type originals, and the potential corresponding to the intermediate gradation area of pencil originals. The characteristics of the photoconductor potential control method of the present invention are as follows.
In the photoreceptor method, which forms an electrostatic latent image by a process consisting of secondary charging, secondary charging, simultaneous image exposure, and full-surface exposure, the potential that builds up in completely unexposed areas before the start of the copying operation ( dark area potential) and intermediate gradation areas such as pencil-drawn areas (
A potential corresponding to a reflection density of 0.3 to 0.5) is formed on the photoreceptor as a model potential, and these potentials are detected by a potential sensor, and primary charging and secondary charging currents are applied so as to approach each target value. It is about controlling the value.
次に本発明の実施例を図面を参照して説明する。Next, embodiments of the present invention will be described with reference to the drawings.
第2図は本発明を実施する電子写真複写機の概略断面図
であって、導電層1.感光層22表面絶縁層3から成る
感光体ドラム4上に、その矢印方向回転に伴って、−・
次帯電器5、二次帯電同時電光器6、全面露光ランプ7
により、静電潜像を形成するようになっている。全面露
光ランf7の後に全面霧光後の感光体電位を検知する電
位センサ8が設けられている。9は現1象部、1oは転
写部、11けクリーニング部である。12はブランク露
光用の光である。FIG. 2 is a schematic cross-sectional view of an electrophotographic copying machine embodying the present invention, in which conductive layers 1. On the photosensitive drum 4 consisting of the photosensitive layer 22 and the surface insulating layer 3, as it rotates in the direction of the arrow, -.
Secondary charger 5, secondary charging simultaneous flasher 6, full exposure lamp 7
This forms an electrostatic latent image. After the entire surface exposure run f7, a potential sensor 8 is provided to detect the potential of the photoreceptor after the entire surface is fogged. Reference numeral 9 indicates a display section, 1o indicates a transfer section, and 11 indicates a cleaning section. 12 is light for blank exposure.
コピー動作前に予めドラム4を回転させ、図示しないブ
ランク罎光ランプを点滅させてブランク露光光12を点
滅させ、完全非露光部に相当する電位(暗部電位)V+
及び鉛筆書き等中間階調部分(反射濃度0.3〜0.
5)に相当する電位V2をドラム4上に作り、電位セン
サ8で測定し7て、とれら電位V、、V2を夫々の目標
値に近づけるべく一次帯電器5による一次帯電及び二次
帯電器6による二次帯電の電流値を制御する。Before the copying operation, the drum 4 is rotated in advance, a blank brightness lamp (not shown) is blinked, and the blank exposure light 12 is blinked, and a potential corresponding to a completely non-exposed area (dark area potential) V+ is set.
and intermediate gradation areas such as pencil writing (reflection density 0.3 to 0.
A potential V2 corresponding to 5) is created on the drum 4, measured by the potential sensor 8, and the primary charger 5 performs primary charging and secondary charger 7 in order to bring the obtained potentials V, V2 closer to their respective target values. 6 controls the current value of secondary charging.
このような制御操作を行う場合、電位V、は一次帯電の
電流値の制御によって、また電位V2は二次帯電の電流
値の制御によって夫々効果的に調節することができる。When performing such a control operation, the potential V can be effectively adjusted by controlling the current value for primary charging, and the potential V2 can be effectively adjusted by controlling the current value for secondary charging.
このような制御を児了した後、上記中間階調部の目標表
面電位の部分に相当程度以上にトナーが付着するような
現像バイアス電圧を現像器9に与える。これにより印刷
、タイプ文字など暗部に対するコピー濃度が十分で且つ
鉛筆書き文字など灰色部分に対しても相当程度以上に濃
いコピー濃度とすることが可能となる。After completing such control, a developing bias voltage is applied to the developing device 9 such that a considerable amount of toner adheres to the target surface potential portion of the intermediate gradation area. This makes it possible to achieve a sufficient copy density for dark areas such as printed and typed characters, and a considerably higher copy density for gray areas such as pencil-written characters.
上記実施例において暗部電位V、の目標値を+450v
に、まだ中間階調部電位V2 (反射濃度0.3相当)
のそれを+200■に設定し、ブランク露光ランプへの
点燈電圧を17Vにして点滅させて、上記の電位制御を
行ったところ、感光体を種種に変化させても、コピー濃
度は低下せず、灰色部分も鮮明にコピーすることができ
た。In the above example, the target value of the dark potential V is set to +450v.
, there is still an intermediate gradation part potential V2 (equivalent to reflection density 0.3)
When I set it to +200■, set the lighting voltage to the blank exposure lamp to 17V, blinked it, and performed the above potential control, the copy density did not decrease even when the photoreceptor was changed to different types. , even gray areas could be clearly copied.
なお、感光体上に前記モデル電位V!及びv2を作るに
は、ブランク露光ランプを点滅させる代シに、電子写真
複写機の原稿台の非原稿部に灰色部を設け、原稿照明ラ
ングの点滅を行うようにしてもよく、又は原稿台の非原
稿部に黒色部、灰色部を設け、原稿照明ランプを点灯し
てこれら黒色部、灰色部を走査するようにしてもよい。Note that the model potential V! on the photoreceptor is and v2, instead of blinking the blank exposure lamp, a gray area may be provided in the non-document area of the document table of the electrophotographic copying machine, and the document illumination rung may be made to blink. A black portion and a gray portion may be provided in the non-document portion of the document, and the document illumination lamp may be turned on to scan these black portions and gray portions.
以上説明したように、本発明においては、モデル電位と
して完全非露光部に相当する電位と、鉛筆書き部分等に
相当する電位とをコピー動作開始前に感光体上に形成し
、これら電位を夫々の目標値に合わせるように制御する
ことにより、感光体が変化しても黒色部のコピーの画像
濃度は十分に保たれ且つ灰色部分も相当な濃度で再現さ
れ、鮮明なコピーを得ることができる効果がある。As explained above, in the present invention, a potential corresponding to a completely unexposed area and a potential corresponding to a pencil-written area, etc. are formed as model potentials on the photoreceptor before the start of copying operation, and these potentials are respectively set as model potentials. By controlling the image density to match the target value, even if the photoconductor changes, the image density of the black part of the copy will be maintained sufficiently, and the gray part will also be reproduced with considerable density, making it possible to obtain clear copies. effective.
第1図は電子写真感光体の感度曲線図、第2図は本発明
方法を実施する電子写真複写機の一例を示す略断面図で
ある。
4:感光体、 5;−次帯電器、6:二次帯
電同時像露光器、
7:全面露光ランプ、 8:電位センサ、9:現像部
、 lO:転写部、11:クリーニング部、
12ニブランク露光用の光。FIG. 1 is a sensitivity curve diagram of an electrophotographic photoreceptor, and FIG. 2 is a schematic sectional view showing an example of an electrophotographic copying machine implementing the method of the present invention. 4: Photoreceptor, 5: Secondary charger, 6: Secondary charging simultaneous image exposure device, 7: Full-surface exposure lamp, 8: Potential sensor, 9: Developing section, IO: Transfer section, 11: Cleaning section, 12 Ni blank light for exposure.
Claims (1)
ノロセスを行なって静電潜像を形成する電子写真法にお
いて、コピー動作開始前に全面露光後の感光体上のモデ
ル電位として完全非露光部に相当する電位及び鉛筆書き
部等の中間階調部に相当する電位を上記プロセスによシ
感光体に形成し、上記の各モデル電位を電位センサで検
知して夫々の目標値に近づけるように夫々−次帯電及び
二次帯電の電流値を制御することを特徴とする感光体電
位制御方法。In an electrophotographic method in which an electrostatic latent image is formed by performing primary charging, secondary charging, simultaneous image exposure, and full-surface exposure on a photoreceptor, a completely neutralized potential is set as the model potential on the photoreceptor after full-surface exposure before the start of copying operation. A potential corresponding to an exposed area and a potential corresponding to an intermediate gradation area such as a pencil-written area are formed on the photoreceptor through the above process, and each of the model potentials described above is detected by a potential sensor and brought closer to each target value. A photoreceptor potential control method characterized by controlling the current values of secondary charging and secondary charging, respectively.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20072782A JPS5990871A (en) | 1982-11-16 | 1982-11-16 | Controlling method of potential of electrophotographic sensitive body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20072782A JPS5990871A (en) | 1982-11-16 | 1982-11-16 | Controlling method of potential of electrophotographic sensitive body |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5990871A true JPS5990871A (en) | 1984-05-25 |
Family
ID=16429183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20072782A Pending JPS5990871A (en) | 1982-11-16 | 1982-11-16 | Controlling method of potential of electrophotographic sensitive body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5990871A (en) |
-
1982
- 1982-11-16 JP JP20072782A patent/JPS5990871A/en active Pending
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