JPH0549984B2 - - Google Patents
Info
- Publication number
- JPH0549984B2 JPH0549984B2 JP58150287A JP15028783A JPH0549984B2 JP H0549984 B2 JPH0549984 B2 JP H0549984B2 JP 58150287 A JP58150287 A JP 58150287A JP 15028783 A JP15028783 A JP 15028783A JP H0549984 B2 JPH0549984 B2 JP H0549984B2
- Authority
- JP
- Japan
- Prior art keywords
- color
- charging
- distance
- image
- development
- 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 - Lifetime
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 8
- 239000003086 colorant Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0105—Details of unit
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
技術分野
この発明は、複数色、特に3色重ね合せ転写方
式のカラー電子写真法に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a color electrophotographic method using a plurality of colors, particularly a three-color overlapping transfer method.
従来技術
3色重ね合せ転写方式のカラー電子写真複写シ
ステムの概要を第1図により説明すると、このシ
ステムでは感光体ドラム4が3回転して1枚のコ
ピーが得られる。コンタクトガラス上に載置され
た原稿1で反射した光線は光路に切換可能に挿入
された青、緑、赤の3色のフイルター2により色
分解され帯電チヤージヤー3により一様に帯電さ
れた感光体ドラム4上に3種の潜像を順次形成す
る。感光体ドラム1の周囲には露光位置に引続い
てシアン、マゼンタ、イエローの3色のトナーを
含む現像剤を夫々有する現像装置7,6,5がこ
の順に配設されている。Prior Art An outline of a color electrophotographic copying system using a three-color overlapping transfer method will be explained with reference to FIG. 1. In this system, the photosensitive drum 4 rotates three times to obtain one copy. The light beam reflected by the original 1 placed on the contact glass is separated into colors by a three-color filter 2 of blue, green, and red that is switchably inserted into the optical path, and the photoreceptor is uniformly charged by a charger 3. Three types of latent images are sequentially formed on the drum 4. Developing devices 7, 6, and 5 each having a developer containing toner of three colors, cyan, magenta, and yellow, are arranged in this order around the photosensitive drum 1 following the exposure position.
まず、青色フイルターを通した光線で形成され
た潜像はイエロー色の現像装置5で現像され、そ
のトナー像は3つの現像装置の後の位置で感光体
ドラム1に接して設けられた転写ドラム8に巻装
された転写紙9に転写ドラム8内の転写チヤージ
ヤー10により転写される。感光体4上の残留ト
ナーはクリーニング装置11でクリーニングさ
れ、次の潜像形成に入る。次いで緑色フイルター
を通した光線で形成された潜像はマゼンタ色の現
像装置6で現像され、そのトナー像は1回転した
転写ドラム8上の同じ転写紙9に前記のイエロー
トナー像と重ね合せて転写される。次いで赤色フ
イルターによる潜像はシアン色現像装置7で限像
され、そのトナー像は同じく同一転写紙上に重ね
合せて転写される。三色のトナー像が重ね合せて
転写された転写紙9は除電チヤージヤー12及び
分離爪により転写ドラム8から分離され、定着装
置13により定着され、機外のトレイ14に排出
されて複写が完了する。 First, a latent image formed by a light beam passing through a blue filter is developed by a yellow developing device 5, and the toner image is transferred to a transfer drum provided in contact with the photoreceptor drum 1 at a position after the three developing devices. A transfer charger 10 in the transfer drum 8 transfers the image onto a transfer paper 9 wrapped around the transfer drum 8 . The remaining toner on the photoreceptor 4 is cleaned by a cleaning device 11, and the next latent image formation begins. Next, the latent image formed by the light beam passing through the green filter is developed by a magenta developing device 6, and the toner image is superimposed with the yellow toner image on the same transfer paper 9 on the transfer drum 8 that has rotated once. transcribed. Next, the latent image formed by the red filter is limited by a cyan color developing device 7, and the toner images are transferred onto the same transfer paper in a superimposed manner. The transfer paper 9 on which the three-color toner images have been superimposed and transferred is separated from the transfer drum 8 by a static eliminating charger 12 and a separating claw, fixed by a fixing device 13, and discharged to a tray 14 outside the machine to complete copying. .
さて、感光体には暗減衰と呼ばれる現象があ
り、帯電時に帯電させた表面電位は暗黒中でも時
間の経過に伴つて減衰する性質がある。したがつ
て、第1図に示したカラー電子写真システムの如
く帯電チヤージヤー3から各現像装置5,6,7
の現像位置迄の感光体ドラム4の周面に沿つた距
離が異る場合は、帯電チヤージヤ3による帯電さ
れた部位が各色現像装置5,6,7による現像位
置20Y,20M,20Cに達する迄の時間に差が
あるため、たとえば帯電チヤージヤ3で感光体ド
ラム4を同一表面電位に帯電させたとしても、各
現像部に達した時には、感光体の暗減衰のために
帯電チヤージヤ3から最も近いシアン現像装置7
による現像位置20Cでは表面電位が高く、最も
遠いイエロー現像装置5による現像位置20Yで
は表面電位が低く、その中間のマゼンタ現像装置
6による現像位置20Mではその中間になる。例
えば、第1図において帯電チヤージヤ3による帯
電部で一定電圧(表面電位で800V)にした場合
シアン現像部20Cでは約750V、マゼンタ現像部
20Mでは約700V、イエロー現像部20Yでは約
650Vとなり、約100V前後の表面電位差を生ず
る。そのため、帯電部に最も近い位置にある現像
装置による画像の濃度は高くなり、最も遠い位置
にある現像装置による画像の濃度は低くなり、こ
れらの画像を重ね合せて作成したカラーコピーは
カラーバランスがくずれ、良好な画質が得られな
い結果となる。 Now, a photoreceptor has a phenomenon called dark decay, and the surface potential charged at the time of charging has a property of decaying over time even in the dark. Therefore, as in the color electrophotographic system shown in FIG.
If the distance along the circumferential surface of the photoreceptor drum 4 to the development position is different, the portion charged by the charger 3 is located at the development position 20 Y , 20 M , 20 C by each color developing device 5 , 6 , 7 . For example, even if the photoreceptor drum 4 is charged to the same surface potential by the charger 3, when it reaches each developing section, the charger 3 is charged due to the dark decay of the photoreceptor. Cyan developing device 7 closest to
The surface potential is high at the development position 20C by the yellow developing device 5, low at the development position 20Y by the farthest yellow developing device 5, and the surface potential is intermediate at the developing position 20M by the magenta developing device 6 located in between. For example, in FIG. 1, when a constant voltage (800 V in surface potential) is applied to the charged portion by the charging charger 3, the cyan developing portion 20C is approximately 750 V, the magenta developing portion 20M is approximately 700 V, and the yellow developing portion 20Y is approximately 750 V.
650V, creating a surface potential difference of around 100V. Therefore, the density of the image produced by the developing device closest to the charging section will be high, and the density of the image produced by the developing device farthest away will be low, and the color copy created by overlapping these images will have poor color balance. This results in distortion and poor image quality.
イエロー、マゼンタ、シアンの各現像位置で表
面電位が一定でない場合、一定濃度の画像を得る
ためにトナー濃度を変化させたり、現像バイアス
を変化させて調整する方法は従来より知られてい
るが、トナー濃度を高くした場合はトナーが飛散
しやすく、又バイアスを小さくした場合は地肌汚
れが生じやすくなるという欠点がある。 When the surface potential is not constant at each development position for yellow, magenta, and cyan, methods of adjusting the toner density or developing bias to obtain an image with a constant density have been known. When the toner concentration is increased, the toner tends to scatter, and when the bias is decreased, the background stains are more likely to occur.
又、色バランスを合せるために青、緑、赤の潜
像の電位を任意に変えられるようにした装置も知
られている。 Also, a device is known in which the potentials of blue, green, and red latent images can be arbitrarily changed in order to match the color balance.
しかし、帯電部から各色現像部迄の距離の差に
よる暗減衰量の差に起因する表面電位の差をあら
かじめ補正した装置は未だ見当らない。 However, no device has yet been found that corrects in advance the difference in surface potential caused by the difference in dark attenuation due to the difference in distance from the charging section to the developing section for each color.
目 的
この発明は、多色重ね合せ転写方式のカラー電
子写真法の帯電部から各色現像部迄の距離の差に
よる暗減衰量の差に起因する表面電位差をあらか
じめ補正し、適正なカラーバランスを有するカラ
ーコピーを得ることのできるカラー電子写真法を
提供することを目的とする。Purpose This invention corrects in advance the surface potential difference caused by the difference in dark attenuation due to the difference in distance from the charging part to the developing part of each color in color electrophotography using a multicolor overlay transfer method, and achieves an appropriate color balance. It is an object of the present invention to provide a color electrophotographic method capable of obtaining color copies with the following characteristics.
構 成
この目的を達成する本発明は、各色現像装置の
現像位置の帯電位置からの距離の差による暗減衰
量の差に起因する表面電位差を補正するために、
各色画像作成時に当該色現像位置での感光表面の
暗部の電位がほゞ一定の電位になるように、帯電
用電源出力を、帯電装置から各現像装置の現像位
置迄の距離に応じて制御するようにしたことを特
徴とする。Configuration The present invention achieves this object by correcting the surface potential difference caused by the difference in dark attenuation due to the difference in distance from the charging position of the developing position of each color developing device.
When creating an image for each color, the charging power output is controlled according to the distance from the charging device to the development position of each development device so that the potential of the dark area of the photosensitive surface at the development position of the color is approximately constant. It is characterized by the following.
その場合、帯電チヤージヤーからの距離が短い
現像装置で現像する画像作成時の帯電用電源出力
を小さくし、帯電チヤージヤーからの距離が長い
現像装置で現像する画像作成時の出力を大きくす
る如く制御すれば目的が達成される。 In that case, control should be performed to reduce the charging power output when creating an image developed with a developing device that is located at a short distance from the charging charger, and to increase the output when creating an image that is developed using a developing device that is located at a long distance from the charging charger. If so, the purpose will be achieved.
以下に本発明を図面に示す実施例にもとずいて
詳細に説明する。 The present invention will be explained in detail below based on embodiments shown in the drawings.
第2図は、第1図に示した構成のカラー電子写
真装置のある一つの実施例について帯電チヤージ
ヤ3の電源出力流を変化させた場合の各現像部2
0Y,20M,20Cでの感光体表面電位の変化を
示す図である。図の直線Y,M,Cは夫々現像部
20Y,20M,20Cに対する曲線を示す。 FIG. 2 shows each developing section 2 when the power output flow of the charging charger 3 is changed in one embodiment of the color electrophotographic apparatus having the configuration shown in FIG.
FIG. 3 is a diagram showing changes in photoreceptor surface potential at 0 Y , 20 M , and 20 C. Straight lines Y, M, and C in the figure represent curves for the developing sections 20 Y , 20 M , and 20 C , respectively.
この図より、各現像部20Y,20M,20Cで
感光体表面電位が700Vになるようにするには、
イエロー画像形成時には帯電々源出力電流を約
300μAに、マゼンタ画像形成時には約250μAに、
シアン画像形成時には約200μAにしなければなら
ないことが判る。すなわち、現像位置が帯電位置
より遠い程帯電用電源出力電流を大きくする必要
があることを示している。 From this figure, in order to make the photoreceptor surface potential 700V at each developing section 20Y , 20M , 20C ,
When forming a yellow image, the charging source output current is reduced to approx.
300μA, approximately 250μA during magenta image formation,
It can be seen that the current must be approximately 200 μA when forming a cyan image. In other words, this indicates that the farther the developing position is from the charging position, the larger the charging power supply output current needs to be.
第3図は帯電チヤージヤの電源出力電流を夫々
約300μA、約250μA、約200μAとした場合の帯電
位置における感光体表面電位と、これらの表面電
位が時間の経過に伴つて暗減衰現象により減衰す
る模様を示す曲線である。図の横軸には帯電位置
(第1図の3)を起点とした各現像位置20C,2
0M,20Y迄の回動角度と所要時間が示されてい
る。即ちシアン現像装置7による現像位置20C
迄の回動角度は65゜で0.72秒を要し、マゼンタ現
像装置6による現像位置20M迄は115゜で1.28秒
を要し、イエロー現像装置5による現像位置20
Y迄は165゜で1.83秒を要する。この実施例は、感光
体ドラム4の直径が120mmで毎分5枚コピーを行
なう場合の例である。図中曲線1はイエロー画像
形成時の曲線で、帯電用電源出力を300μAとした
とき、帯電位置で感光体表面電位が約900Vにな
り、1.83秒後にイエロー現像位置20Yに達した
時点では700Vに減衰することを示す。又、マゼ
ンタ画像形成時は曲線2に示す如く、帯電用電源
出力が250μAで、帯電位置で表面電位が約800V
であつたものが1.28秒後マゼンタ現像位置で
700Vに減衰する。又、シアン画像形成時には、
曲線3に示す如く、帯電用電源出力が200μAで帯
電位置で表面電位が約750Vであつたものが、
0.72秒後シアン現像位置で700Vに減衰する。 Figure 3 shows the photoreceptor surface potential at the charging position when the power supply output current of the charging charger is approximately 300 μA, approximately 250 μA, and approximately 200 μA, respectively, and how these surface potentials attenuate over time due to the dark decay phenomenon. It is a curved line that shows a pattern. The horizontal axis of the figure shows each development position 20 C , 2 starting from the charging position (3 in Figure 1).
The rotation angle and time required to reach 0 M and 20 Y are shown. That is, the development position 20 C by the cyan development device 7
The rotation angle is 65 degrees and it takes 0.72 seconds, and the rotation angle is 115 degrees and it takes 1.28 seconds to reach the development position 20 M by the magenta developing device 6.
It takes 1.83 seconds to reach Y at 165°. This embodiment is an example in which the photosensitive drum 4 has a diameter of 120 mm and five copies are made per minute. Curve 1 in the figure is a curve during yellow image formation. When the charging power supply output is 300 μA, the photoreceptor surface potential becomes approximately 900 V at the charging position, and 700 V when it reaches the yellow development position 20 Y after 1.83 seconds. It is shown that the attenuation occurs as follows. Also, when forming a magenta image, as shown in curve 2, the charging power supply output is 250 μA, and the surface potential at the charging position is approximately 800 V.
After 1.28 seconds, the hot one is at the magenta development position.
Attenuates to 700V. Also, when forming a cyan image,
As shown in curve 3, when the charging power supply output was 200μA and the surface potential at the charging position was approximately 750V,
After 0.72 seconds, it decays to 700V at the cyan development position.
第4図は各色画像形成時に帯電用電源出力を上
記の如く変化させるための帯電用電源のブロツク
回路図である。制御回路30によりイエロー画像
形成用信号Y、マゼンタ画像形成用信号M、シア
ン画像形成用信号Cの各信号を順次帯電用電源3
1に入力した場合帯電用電源の出力電流をこれに
応じて順次降下させる如く変化させるように構成
してある。 FIG. 4 is a block circuit diagram of a charging power supply for changing the charging power supply output as described above during the formation of each color image. The control circuit 30 sequentially sends the signals Y for forming a yellow image, the signal M for forming a magenta image, and the signal C for forming a cyan image to the charging power source 3.
1, the output current of the charging power source is changed so as to sequentially decrease accordingly.
したがつて、カラーコピー時、各色画像形成信
号が発せられると色分解フイルターが切換えら
れ、当該色の現像装置が作動するとともに帯電用
電源の出力電流が自動的に切換えられ前述の如く
暗減衰による感光体表面電位の減衰の差を補正し
て、どの現像位置でも同一の感光体表面電位が自
動的に得られ、その結果、カラーバランスの良好
なカラーコピーを得ることができる。 Therefore, during color copying, when an image forming signal for each color is issued, the color separation filter is switched, the developing device for the color is activated, and the output current of the charging power source is automatically switched, resulting in dark attenuation as described above. By correcting the difference in attenuation of the photoreceptor surface potential, the same photoreceptor surface potential can be automatically obtained at any development position, and as a result, a color copy with good color balance can be obtained.
なお、3色の現像はイエロー、マゼンタ、シア
ンの順に行なわれるが、第1図に示した装置の例
では3つの現像装置は帯電装置に近い方からシア
ン、マゼンタ、イエローの順に設けられている。
その理由は、感光体ドラムを3回転させて、3つ
のトナー像を重ね合せてカラー画像を作成する場
合、現像装置がこれと逆にイエロー、マゼンタ、
シアンの順に設けらていると、感光体ドラムの直
径を小さくした場合、現像タイミングの関係で電
気的に問題が発生するからである。感光体ドラム
の直径がタイミング的に充分余裕がある場合は、
現像装置をイエロー、マゼンタ、シアンの順に並
べることも勿論可能である。その場合は、帯電用
電源の出力は前記の例とは逆に順次上昇させる如
く変化させればよい。 Note that three-color development is performed in the order of yellow, magenta, and cyan, but in the example of the apparatus shown in FIG. 1, the three developing devices are provided in the order of cyan, magenta, and yellow from the one closest to the charging device. .
The reason for this is that when creating a color image by superimposing three toner images by rotating the photoreceptor drum three times, the developing device
This is because if they are provided in cyan order, electrical problems will occur due to development timing when the diameter of the photoreceptor drum is made smaller. If the diameter of the photoreceptor drum has enough margin in terms of timing,
Of course, it is also possible to arrange the developing devices in the order of yellow, magenta, and cyan. In that case, the output of the charging power source may be changed so as to increase sequentially, contrary to the above example.
又、この発明は3色画像重ね合せ方式の電子写
真カラー複写機の他、2つの現像装置を感光体ド
ラムの周囲の順次設けた2色カラー複写機にも適
用することができる。 Further, the present invention can be applied not only to an electrophotographic color copying machine using a three-color image superimposition system but also to a two-color color copying machine in which two developing devices are sequentially provided around a photoreceptor drum.
効 果
以上の如く、本発明によれば、帯電位置から各
色現像装置迄の距離の差に起因する感光体表面電
位の暗減衰の差が自動的に補正され、カラーバラ
ンスの良好なカラーコピーを得ることができる。Effects As described above, according to the present invention, the difference in dark attenuation of the photoreceptor surface potential caused by the difference in distance from the charging position to the developing device for each color is automatically corrected, and color copies with good color balance can be produced. Obtainable.
第1図は3色重ね合せ方式のカラー電子写真複
写装置の概略構成を示す断面図、第2図は上記構
成の装置において帯電々源出力電流を変えた場合
の各現像部での感光体表面電位の変化を示す曲線
図、第3図は帯電々源出力電流を各色現像時毎に
変化させた場合の夫々の暗減衰の様子を示す曲線
図、第4図は帯電々源装置の制御回路を示すブロ
ツクダイアグラムである。
1……原稿、2……色分解用フイルタ、3……
帯電装置、4……感光体ドラム、5,6,7……
各色現像装置、9……転写紙、10……転写装
置、20Y,20M,20C……現像位置。
Figure 1 is a cross-sectional view showing the schematic configuration of a color electrophotographic copying device using a three-color superimposition method, and Figure 2 is a photoconductor surface in each developing section when the charging source output current is changed in the device with the above configuration. A curve diagram showing changes in potential. Figure 3 is a curve diagram showing dark decay when the charging source output current is changed for each color development. Figure 4 is a control circuit of the charging source device. This is a block diagram showing the following. 1... Original, 2... Color separation filter, 3...
Charging device, 4... Photosensitive drum, 5, 6, 7...
Each color developing device, 9...transfer paper, 10...transfer device, 20Y , 20M , 20C ...developing position.
Claims (1)
順に1つの帯電装置、露光位置、互いに異る色の
複数の現像装置、転写位置が配設された装置を使
用し、複数の色に色分解された原稿の像を順次上
記感光体ドラムに露光し、感光体ドラム上に対応
して形成された各色トナー像を上記転写位置で同
一転写紙上に重ね合せて転写し、カラー複写を行
なうカラー電子写真法において、各色画像作成時
に当該色の現像装置による現像位置における感光
体表面の暗部の電位がほゞ同一になる如く帯電用
電源出力電流を、帯電装置から各現像装置の現像
位置迄の感光体ドラム周面に沿つた距離に応じて
その距離が短い程小さく、長い程大きくする如く
制御することを特徴とするカラー電子写真法。1. A device is used in which a charging device, an exposure position, multiple developing devices of different colors, and a transfer position are arranged around a single photosensitive drum in the order of its rotational direction. The image of the separated document is sequentially exposed to the photoreceptor drum, and each color toner image formed correspondingly on the photoreceptor drum is superimposed and transferred onto the same transfer paper at the transfer position to perform color copying. In electrophotography, when creating an image for each color, the charging power supply output current is applied from the charging device to the development position of each development device so that the potential of the dark area on the surface of the photoreceptor at the development position by the development device of the color is almost the same. A color electrophotographic method characterized by controlling the distance along the circumferential surface of a photoreceptor drum so that the shorter the distance, the smaller the distance, and the longer the distance, the larger the distance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58150287A JPS6043672A (en) | 1983-08-19 | 1983-08-19 | Color electrophotographing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58150287A JPS6043672A (en) | 1983-08-19 | 1983-08-19 | Color electrophotographing method |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8068182A Division JPH08272172A (en) | 1996-03-25 | 1996-03-25 | Color electrophotographic method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6043672A JPS6043672A (en) | 1985-03-08 |
JPH0549984B2 true JPH0549984B2 (en) | 1993-07-27 |
Family
ID=15493678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58150287A Granted JPS6043672A (en) | 1983-08-19 | 1983-08-19 | Color electrophotographing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6043672A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61120175A (en) * | 1984-11-16 | 1986-06-07 | Canon Inc | Electrophotographic device |
JP2784768B2 (en) * | 1988-07-11 | 1998-08-06 | キヤノン株式会社 | Image forming device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58107555A (en) * | 1981-12-22 | 1983-06-27 | Canon Inc | Color copying device |
-
1983
- 1983-08-19 JP JP58150287A patent/JPS6043672A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58107555A (en) * | 1981-12-22 | 1983-06-27 | Canon Inc | Color copying device |
Also Published As
Publication number | Publication date |
---|---|
JPS6043672A (en) | 1985-03-08 |
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