JPS6022135A - Potential control method of electrophotographic device - Google Patents
Potential control method of electrophotographic deviceInfo
- Publication number
- JPS6022135A JPS6022135A JP58129441A JP12944183A JPS6022135A JP S6022135 A JPS6022135 A JP S6022135A JP 58129441 A JP58129441 A JP 58129441A JP 12944183 A JP12944183 A JP 12944183A JP S6022135 A JPS6022135 A JP S6022135A
- Authority
- JP
- Japan
- Prior art keywords
- potential
- contrast
- original
- standard
- exposure
- 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
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
- G03G15/5037—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor the characteristics being an electrical parameter, e.g. voltage
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
(呟業上の利用分野)
本発明は、電子写真y&置の感光体上へ6静電潜像を、
複写する原稿の地肌と文字パターンの画像濃度のコント
ラストに応じて、最適状態に自動制御する方法に関する
。Detailed Description of the Invention (Field of Industrial Use) The present invention provides six electrostatic latent images on a photoreceptor in an electrophotographic device.
The present invention relates to a method for automatically controlling to an optimum state according to the contrast between the background of a document to be copied and the image density of a character pattern.
(従来技術)
電子写真法によって形成される静電潜像は、一般に、環
境変動や感光体の劣化、長時間休止等の諸条件によつC
不安定となるために、コピー前に感光体上にモデル電位
を形成し、このモデル電位を電位センサで検知し、予め
定めた標準゛電位と上記モデル電位とが等しくなるよう
に帯電111や露光量等を制御する方法が知られている
。(Prior art) Electrostatic latent images formed by electrophotography generally suffer from C due to various conditions such as environmental changes, deterioration of the photoreceptor, and long periods of rest.
To avoid instability, a model potential is formed on the photoreceptor before copying, this model potential is detected by a potential sensor, and charging 111 and exposure are performed so that the model potential becomes equal to a predetermined standard potential. Methods for controlling the amount etc. are known.
しかしながら、このような方法にあっては、標準電位を
定める場合には、薄手原稿やカラー印刷原稿などのよう
に、原稿の地肌と文字パターンの画像濃度のコントラス
トが低い原稿でも文字パターンが鮮明にコピーされる条
件や、感光体の帯電劣化を少くする条目二等を考慮する
必委があり、たとえば、表面絶I&層、感光層、導電層
から成る感−光体に、−次−P/1竜、二次帯電同時画
像Dx光、全dlr露光により静電潜像を形成する電子
写真装(6:において、モデル電位に暗部電位(完全非
命光4)と明部電位(完全露光部)とを用いた場も、低
コントラスト原稿の文字パターンを蔚明にコピーするた
めには、前記暗部電位と明部電位との′磁位差を大きく
する必要があるが、そのために−次、二次帯電愉が増加
して、感光体の劣化を促進するという問題を生ずるので
、このように標準型1σを決定するに当っては、いくつ
かの相反する条件を満足させる必要があり、困難を伴う
ことが多いという問題点があった。However, with this method, when determining the standard potential, it is necessary to ensure that the character pattern is clear even on originals with low contrast between the background of the original and the image density of the character patterns, such as thin originals or color printed originals. It is necessary to take into account the copying conditions and the second layer to reduce charging deterioration of the photoreceptor. 1. An electrophotographic device that forms an electrostatic latent image by simultaneous secondary charging image Dx light and full DLR exposure (6: In model potential, dark area potential (complete non-light 4) and bright area potential (fully exposed area) In order to clearly copy the character pattern of a low-contrast original, it is necessary to increase the magnetic potential difference between the dark potential and the bright potential. This causes the problem of increased secondary charging and accelerated deterioration of the photoconductor, so in determining the standard type 1σ, it is necessary to satisfy several conflicting conditions, which is difficult. The problem was that it was often accompanied by
(発明の目的)
本発明は、AiJ記のような電子写真法において、低コ
ントラスト原稿の文子パターンを蔚明にコピーし、かつ
感光体の劣化を少くすることを目的とするもので、煩写
する原稿のコントラスlr、静電潜像の表面電位といて
検出し、判別し、コントラストが低い場合は標準′電位
の電位差を太きくし、またコントラストが高い場合は標
準電位の電位差を小さくすることによって上記目的を達
成しようとするものである。(Object of the Invention) The present invention aims to copy the pattern of a low-contrast original in an electrophotographic method such as AiJ, and to reduce the deterioration of the photoreceptor. The contrast lr of the original to be printed and the surface potential of the electrostatic latent image are detected and discriminated, and when the contrast is low, the potential difference between the standard potentials is increased, and when the contrast is high, the potential difference between the standard potentials is decreased. This aims to achieve the above objectives.
第1図は、各棹原稙の種類とその静電潜像の平均表面電
位との関係を示すもので、低コントラスト原稿である博
学原稿や、カラー印刷などと、高コントラスト原稿であ
る白黒印刷、色紙印刷などとは、平均表面′電位から区
別することが可能であることを読取することができる。Figure 1 shows the relationship between each type of Minoru Sawahara and the average surface potential of its electrostatic latent image. , colored paper printing, etc. can be distinguished from the average surface potential.
(問題を解決するための手段)
前記の目的を達成するために、本発明は、複写する原稿
の地肌と文字パターンの画(& 濃度のコントラストを
静電潜像の表面電位として検出、判別し、孕め定めた方
式に従って原稿のコントラストに応じた標準電位を用い
るようにしたものである。(Means for Solving the Problem) In order to achieve the above object, the present invention detects and discriminates the contrast between the background and character pattern images (& density) of a document to be copied as the surface potential of an electrostatic latent image. , a standard potential corresponding to the contrast of the original is used according to a predetermined method.
(実施例)
以下に、本発明の構成および作用を1而に基づいて説明
する。第2図は、本発明の電子写真装置の構成の一実施
例を示す。表■杷蘇層1.感光層2、導電層3より成る
感光ドラム(第3図は、その部分的詳細説明図である)
に、−成帯電器5、二次帯′屯同時画像露光器6、全鮨
元ランプ7により靜電箔像を形成し、現像器8でトナー
による現IWを行ない、転写帯電器9によって、給紙ロ
ーラ10により送られる転写紙11にトナー像を転写し
、加熱および加圧ローラから成る定腐器12により前i
己トナー像を転写紙に定着し、13へ排紙する。また転
写に利用しつくさねなかったトナーを表面に鳴する感光
ドラム4は、クリーニング装置縁14により残余トナー
をクリーニングする。(Example) Below, the configuration and operation of the present invention will be explained based on one example. FIG. 2 shows an embodiment of the configuration of an electrophotographic apparatus according to the present invention. Table ■ Loquat layer 1. A photosensitive drum consisting of a photosensitive layer 2 and a conductive layer 3 (FIG. 3 is a partially detailed explanatory diagram)
Then, a static foil image is formed by the -forming charger 5, the secondary belt simultaneous image exposure device 6, and the full-scale original lamp 7, the developing device 8 performs toner IW, and the transfer charger 9 supplies the image. The toner image is transferred onto a transfer paper 11 sent by a paper roller 10, and then pre-processed by a preservative device 12 consisting of a heating and pressure roller.
The self-toner image is fixed on the transfer paper and the paper is discharged to 13. Further, the photosensitive drum 4, which carries the toner that has not been used for transfer, is removed from the surface by the cleaning device edge 14 to remove the remaining toner.
コピー開始キーが押されると、潜像形成プロセスが開始
され、ブランク露光ランプ16を点灯し7てドラム上を
照射することにより、ドラム上に明部電位v1を形成し
、+たブランク露光ランプ7を消灯することにより、ド
ラム上に暗部屯B’L V 2を形成する。しかるのち
、全面無光ランプ7の後に設けた表面゛電位センナ17
により、前i己明部電位V、および暗部電位v2を両足
しC演算、制御、記憶P、(S18に送り、予め定めた
高コントラスト涼イ^用の標準電位と比較して、この標
準゛電位に近付くように演算した後、その制御値を−ベ
および二a高圧トランス19 、20へ送り、−次、二
次帯電の各電流1−を制御する。When the copy start key is pressed, the latent image forming process is started, and the blank exposure lamp 16 is turned on to irradiate the drum, forming a bright area potential v1 on the drum. By turning off the light, a dark area B'L V 2 is formed on the drum. After that, the surface potential sensor 17 installed after the full-surface non-light lamp 7
Then, the bright area potential V and the dark area potential v2 are added together and sent to S18, and compared with a predetermined standard potential for high contrast cooling. After calculation is made to approximate the potential, the control value is sent to the high-voltage transformers 19 and 20, and the secondary and secondary charging currents 1- are controlled.
つきに、原稿台21の非原稿部に設けた原稿反射濃度0
.05〜0.2相当の標準白色板22を、原稿照明ラン
プ23により豚光し、その露光15により感光ドラム4
上に白色部電位v3を形成し、電位センサ17で測定し
て前記演算、制御、記憶部18に送り、予め定めた高コ
ントラスト原稿用標準電位と比軟して、この標準電位に
近付くように演算した後、その制御値を原稿ランプ電源
24に送り、原稿照明電圧を制御する。つぎに、この制
御された帯電量 露光量を用いCIS稿の静゛亀潜像を
J体成し、その多面電位を電位七ン丈17で両足して、
演算、制・1、記憶部18に送り、原稿の静電潜像の平
均表面゛電位を演算して、その値が予め定めた高コント
ラスト原稿を想定した範囲内にあれは、そのま喰の帯電
器と露光量でコピーを行ない、また予め定めた低コント
ラスト原稿を想定した範囲内であれば、標準電位を低コ
ントラスト用に切替えて前述の制御をやり直した後にコ
ピーを行なう。At the same time, the original reflection density 0 provided in the non-original part of the original platen 21
.. A standard white plate 22 equivalent to 0.05~0.2 is illuminated by the original illumination lamp 23, and the exposure 15 causes the photosensitive drum 4 to
A white part potential v3 is formed on the top, measured by the potential sensor 17, and sent to the calculation, control, and storage unit 18, and is softened in comparison with a predetermined standard potential for high-contrast originals so that it approaches this standard potential. After the calculation, the control value is sent to the original lamp power supply 24 to control the original illumination voltage. Next, a static latent image of the CIS manuscript is formed using this controlled charge amount and exposure amount, and the multifaceted potentials are added together with the potential length 17.
Calculation, control 1, the average surface potential of the electrostatic latent image of the document is calculated, and if the value is within a predetermined range assuming a high-contrast document, it is processed as is. Copying is performed using the charger and the exposure amount, and if it is within a predetermined range assuming a low-contrast original, the standard potential is switched to low-contrast and the above-mentioned control is re-performed before copying is performed.
これを実証するために、実除に、明部、暗部電位の各標
準電位を、^コントラスト原稿の場合には、ツレ(’t
1.−100 V 、 350 Vニ、!*低コントラ
スト原稿の場合には、それぞれ−150VI600Vと
し、白色部電位の標準電位は、どちらの場合にもOvと
し゛C制御を行ない、平均電位が60〜250vの範囲
の時は高コントラスト原稿、55v以下または255V
以上の時は低コントラスト原稿と区別してコピーを行っ
た。In order to demonstrate this, we actually measured the standard potentials of the bright and dark areas, and in the case of contrast originals, the deviation ('t
1. -100 V, 350 V! *For low-contrast originals, set the standard potential to -150VI and 600V, respectively. In both cases, perform Ov and -C control for the standard potential of the white part. When the average potential is in the range of 60 to 250v, set it to 55V for high-contrast originals. Below or 255V
In the above cases, copying was performed while distinguishing from low-contrast originals.
また、比較のために、従来の基準で明部、暗部。Also, for comparison, bright and dark areas are compared using conventional standards.
白色部電位の各標準電位を、それぞれ−L50V。Each standard potential of the white part potential is -L50V.
450V、OVとしCコピーを行った。C copy was performed at 450V and OV.
まず低コントラスト原稿のMとして、博学原稿で、文字
の反射aV:が0.3の場合では、従来例では0.5の
反射#曳となってコピーされたのに対し、本発明では0
.85の反射濃度でコピーされ、低コントラスト原稿で
も鮮明なコピーが得られた。First, as for M of a low-contrast original, in the case of an erudite manuscript with character reflection aV: 0.3, in the conventional example, it was copied with a reflection # of 0.5, whereas in the present invention, it was copied with a reflection # of 0.5.
.. Copies were made with a reflection density of 85, and clear copies were obtained even with low contrast originals.
つぎに、5万枚コピーを行った後に、感光ドラム4を電
子写真皆直内に放置したまま一時間休止した後に、10
0枚連続コピーを行ない、その一枚目と100枚目の暗
部電位を棚定したところ、従来例が70Vであるのに本
発明では40Vとなり、感光体の帯電劣化も少いことが
実際に確められた。Next, after copying 50,000 sheets, the photosensitive drum 4 was left in front of all the electronic photographs, and after an hour's rest, 100,000 copies were made.
When 0 copies were made continuously and the dark area potential of the 1st and 100th copies was determined, it was 40V in the present invention, whereas it was 70V in the conventional example, which actually shows that there is less charging deterioration of the photoreceptor. Confirmed.
尚、カールシンプロセス、NPプロセスに1収うず本願
は適用できる。Incidentally, the present application can be applied to the Carlsyn process and the NP process.
(他の実施例)
前記第一実施例のほか、特に図示はしないが、予め高コ
ントラストIfA福用と低コントラスト原稿用とでのそ
n、それの標準電位に対して制御を行ない、その側倒1
された帝奄蝋と蕗光阻を記憶しCおいて、゛高コントラ
スト原稿用の潜像条件で複写する原稿のコントラストを
検出して判別し、原稿が高コントラストであればそのま
まの潜像条14=で、低コントラストの場合は記憶しで
おいた低コントラスト用の潜像条件に切替えてコピーを
行うことも可能であり、原稿のコントラスト検知後に制
御を行なわない分だけ、いわゆるファーストコピ一時間
(コピー開始キーが押さハ、てから、一枚目の転写紙に
原稿像がコピーされてjJF紙さ7′1.る牛での時間
)全短縮することができる。(Other Embodiments) In addition to the first embodiment, although not particularly shown in the drawings, control is performed in advance for the standard potentials of high-contrast IfA use and low-contrast original use, and Down 1
Memorize the Teijaku wax and photoresistance C, then detect and discriminate the contrast of the original to be copied under the latent image conditions for high contrast originals, and if the original has high contrast, use the same latent image condition. 14=, if the contrast is low, it is possible to switch to the memorized latent image conditions for low contrast and copy, and the so-called first copy time is 1 hour by the time that no control is performed after detecting the contrast of the original. (The time it takes for the original image to be copied onto the first sheet of transfer paper after the copy start key is pressed and the original image to be printed on the JJF paper) can be completely shortened.
また、原稿の静゛屯7鹸像の平均表面゛電位より、予め
定めた計算式に従って原稿照明ランプの適止露光電圧を
惟足し、原稿照明ランプ電線を制御することにより、自
動露光も合わせて行うことも可能である。In addition, automatic exposure is also possible by adding the appropriate exposure voltage of the document illumination lamp according to a predetermined calculation formula based on the average surface potential of the static image of the document and controlling the document illumination lamp electric wire. It is also possible to do so.
(発明の効果)
以上説明してきたように、本発明では、複写する原稿の
地肌と文字パターンの画像濃度のコントラストにより標
準′屯田を変えることによって、低コントラスト原稿の
文字パターンも鮮明にコピーすることができるほか、感
光体の劣化を減少させるという効果が得られる。(Effects of the Invention) As explained above, in the present invention, character patterns of low-contrast originals can be clearly copied by changing the standard value depending on the contrast between the background of the original to be copied and the image density of the character pattern. In addition to this, it also has the effect of reducing deterioration of the photoreceptor.
第1図は、各捗原桶の欅類とその静電潜像の平均表面電
位との関係を示す図、第2図は、本発明の一実施例を説
明するための構成断面図、第3図は、感光ドラムの部分
的詳細説明図である。
4・・・・・・・・・感光ドラム
5・・・・・・・・・−成帯電器
6・・・・・・・・・二次帯電同時画像露光器7・・・
・・・・・・全面露光ランプ
8・・・・・・・・・現像器
9・・・・・・・・・転写帯電器
11・・・・・・・・・転写紙
16・・・・・・・・・ブランク無光う/ブ17・・・
・・・・・・C表亀1)゛電位センサ18・・・・・・
・・・演算、制f卸、記憶部19.20・・・・・・・
・・−次、二次iM4圧トラノス22・・・・・・・・
・標準白色板
23・・・・・・・・・原稿照明ランプ24・・・・・
・・・・原稿照明ランプ市原v + 、 V 2 、V
s・・・・・・明部、暗部および白色部の各モデル°
屯泣FIG. 1 is a diagram showing the relationship between the zelkovas of each suzuhara-oke and the average surface potential of its electrostatic latent image. FIG. FIG. 3 is a partially detailed explanatory diagram of the photosensitive drum. 4...Photosensitive drum 5...-Charger 6...Secondary charging simultaneous image exposure device 7...
......Full exposure lamp 8...Developer 9...Transfer charger 11...Transfer paper 16...・・・・・・Blank no light/Bu17...
・・・・・・C table turtle 1)゛Potential sensor 18・・・・・・
...Calculation, control, storage section 19.20...
...-Next, secondary iM4 pressure tranos 22...
・Standard white plate 23...Original illumination lamp 24...
...Manuscript illumination lamp Ichihara v + , V 2 , V
s...Models for bright, dark and white areas°
Crying
Claims (1)
位を形成し、これらモデル電位を電位センサで検知し、
予め定めた各標準電位と前記各モデル電位とが等しくな
るように帯“亀喰又は鈷光量等を制御する方式において
%複写する原稿の地肌と文字パターンの画像濃度のコン
トラストを1011潜像の表面電位として検出5判別し
、予め足めた方式に従って原稿のコントラストに応じた
各標準電位を用いることを特徴とする電子写真y7を置
の電位制御法。Before copying in an electrophotographic device, each model potential is formed on the photoreceptor, and these model potentials are detected by a potential sensor.
The surface of the latent image is calculated by calculating the contrast between the image density of the background of the document to be copied and the character pattern by % in a method of controlling the amount of light, etc. so that each predetermined standard potential and each of the model potentials are equal. A potential control method for electrophotography, which is characterized by detecting and discriminating potentials and using each standard potential according to the contrast of the original according to a predetermined method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58129441A JPS6022135A (en) | 1983-07-18 | 1983-07-18 | Potential control method of electrophotographic device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58129441A JPS6022135A (en) | 1983-07-18 | 1983-07-18 | Potential control method of electrophotographic device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6022135A true JPS6022135A (en) | 1985-02-04 |
Family
ID=15009539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58129441A Pending JPS6022135A (en) | 1983-07-18 | 1983-07-18 | Potential control method of electrophotographic device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6022135A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6258453U (en) * | 1985-06-17 | 1987-04-11 | ||
JPS62125842A (en) * | 1985-11-27 | 1987-06-08 | Nippon Zeon Co Ltd | Coal ash-aqueous slurry composition |
-
1983
- 1983-07-18 JP JP58129441A patent/JPS6022135A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6258453U (en) * | 1985-06-17 | 1987-04-11 | ||
JPH0526584Y2 (en) * | 1985-06-17 | 1993-07-06 | ||
JPS62125842A (en) * | 1985-11-27 | 1987-06-08 | Nippon Zeon Co Ltd | Coal ash-aqueous slurry composition |
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