JPH0792763A - Color image forming device - Google Patents
Color image forming deviceInfo
- Publication number
- JPH0792763A JPH0792763A JP5233374A JP23337493A JPH0792763A JP H0792763 A JPH0792763 A JP H0792763A JP 5233374 A JP5233374 A JP 5233374A JP 23337493 A JP23337493 A JP 23337493A JP H0792763 A JPH0792763 A JP H0792763A
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- Japan
- Prior art keywords
- transfer belt
- intermediate transfer
- image
- color
- mark
- 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.)
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- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
- Color Electrophotography (AREA)
- Color, Gradation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】複写機、ファクシミリ、プリンタ
等の画像形成装置に関し、特に、感光体上のトナ−像を
中間転写ベルト上に転写し、中間転写ベルトから転写紙
上にトナ−像を転写するカラ−画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a facsimile, a printer, etc., in particular, a toner image on a photoconductor is transferred onto an intermediate transfer belt, and the toner image is transferred from the intermediate transfer belt onto a transfer paper. Color image forming apparatus.
【０００２】[0002]
【従来技術】複数色のトナ−像を転写紙上に多重転写す
る所謂フルカラ−画像形成装置にあっては、多重転写時
における各色間の重ねあわせズレが極めて大きな問題で
ある。 この問題を解決するため、出願前公知の特開昭
６３−３００２６０にあっては、転写紙を担持して複数
の感光体のそれぞれの転写位置に転写紙を搬送する転写
ベルト上にレジストマ−クを形成し、このレジストマ−
クを検出することによって発生するレジストマ−ク検出
信号に応じて、感光体上に光画像を書き込む書き込み光
学系の姿勢を調整する画像形成装置が提案されている。2. Description of the Related Art In a so-called full-color image forming apparatus that multiple-transfers toner images of a plurality of colors onto a transfer sheet, a misregistration between the colors during the multiple-transfer is a very serious problem. In order to solve this problem, in Japanese Patent Laid-Open No. 63-300260 known before the application, a resist mark is formed on a transfer belt that carries the transfer paper and conveys the transfer paper to each transfer position of a plurality of photoconductors. To form this resist
An image forming apparatus has been proposed which adjusts the attitude of a writing optical system that writes an optical image on a photoconductor in accordance with a resist mark detection signal generated by detecting a mark.
【０００３】しかしながら、このような画像形成装置に
あっても、書き込み光学系の画像書き込み開始タイミン
グにズレがあると、多重転写時の各色間の重ねあわせズ
レが発生するといった問題を有している。However, even in such an image forming apparatus, if there is a deviation in the image writing start timing of the writing optical system, there is a problem that an overlay deviation between the colors occurs during multiple transfer. .
【０００４】本発明は、多重転写時の各色間の重ねあわ
せズレが発生することのない、カラ−画像形成装置を提
供することを目的とするものである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a color image forming apparatus which does not cause misregistration between colors during multiple transfer.
【０００５】本発明のカラ−画像形成装置は、感光体
と、前記感光体上に色分解した静電潜像を形成する手段
と、前記静電潜像を各色分解像と補色関係にあるトナ−
で現像する手段と、中間転写ベルトと、前記トナ−像を
前記中間転写ベルト上に転写する手段と、前記中間転写
ベルト上のトナ−像を転写紙上に転写する手段とを有す
るカラ−画像形成装置において、前記中間転写ベルト上
の所定位置に形成されたマ−クと、前記マ−クを検出す
る検出手段と、前記マ−ク検出手段からの検出信号に基
づき前記静電潜像形成手段の動作開始タイミングを制御
する制御手段とを有する。The color image forming apparatus of the present invention comprises a photoconductor, means for forming a color-separated electrostatic latent image on the photoconductor, and a toner having a complementary color relationship with the electrostatic latent image. −
Color image formation having means for developing with an intermediate transfer belt, means for transferring the toner image onto the intermediate transfer belt, and means for transferring the toner image on the intermediate transfer belt onto a transfer paper. In the apparatus, a mark formed at a predetermined position on the intermediate transfer belt, a detecting means for detecting the mark, and the electrostatic latent image forming means based on a detection signal from the mark detecting means. And a control means for controlling the operation start timing of.
【０００６】中間転写ベルト上のマ−クを検出手段が検
出し検出信号を出力すると、この信号は静電潜像形成手
段の動作開始タイミングを制御する手段に入力され、静
電潜像形成手段の動作開始タイミングが制御される。When the detection means detects the mark on the intermediate transfer belt and outputs a detection signal, this signal is input to the means for controlling the operation start timing of the electrostatic latent image forming means, and the electrostatic latent image forming means is formed. The operation start timing of is controlled.
【０００７】図１は、本実施例に係るカラ−複写装置の
感光体・中間転写ベルト回りの拡大図、図２は同カラ−
複写装置の概略構成図である。まず、本装置の構成、動
作の概略を説明する。カラ−画像読み取り装置１は、原
稿３の画像を照明ランプ４、ミラ−群５ａ〜５ｃ、及び
レンズ６を介してカラ−センサ−７に結像して、原稿の
カラ−画像情報を例えばブル−、グリ−ン、レッドの色
分解光ごとに読み取り、電気的な画像信号に変換する。
そして、このカラ−スキャナ−１で得たブル−、グリ−
ン、レッドの色分解画像信号は画像処理部で色変換処理
が行われ、ブラック、シアン、マゼンタ、イエロ−のカ
ラ−画像デ−タを得る。このカラ−画像デ−タを用い
て、カラ−画像記録装置２により、ブラック、シアン、
マゼンタ、イエロ−の顕像化を行い、これらの顕像を重
ねあわせて４色のフルカラ−画像を形成する。FIG. 1 is an enlarged view around a photoconductor / intermediate transfer belt of a color copying apparatus according to this embodiment, and FIG. 2 is the same color copying apparatus.
It is a schematic block diagram of a copying apparatus. First, an outline of the configuration and operation of this device will be described. The color image reading apparatus 1 forms an image of the original 3 on the color sensor 7 through the illumination lamp 4, the mirror groups 5a to 5c, and the lens 6, and outputs the color image information of the original to, for example, a blue image. −, Green and red color-separated light are read and converted into electrical image signals.
And the blue and green obtained with this color scanner-1
The color-separated image signals of red and red are subjected to color conversion processing in the image processing unit to obtain color image data of black, cyan, magenta, and yellow. By using this color image data, the color image recording device 2 performs black, cyan,
Visualization of magenta and yellow is performed, and these visual images are superposed to form a full-color image of four colors.
【０００８】次に、カラ−画像記録装置の概要を説明す
る。書き込み光学ユニット８はカラ−スキャナ−１から
のカラ−画像デ−タを光信号に変換して、原稿画像に対
応した光書き込みを行い、感光体ドラム９に静電潜像を
形成する。書き込み光学ユニット８は、レ−ザ−８ａと
ポリゴンミラ−８ｂとその回転用モ−タ８ｃ、ｆ／θレ
ンズ８ｄ、及び反射ミラ−８ｅ等で構成されている。プ
リンタ部２の感光体ドラム９は、反時計方向に回転し、
その回りには、クリ−ニングユニット１０、除電ランプ
１１、帯電器１２、電位センサ−１３、ブラック現像器
１４、シアン現像器１５、マゼンタ現像器１６、イエロ
−現像器１７、Ｐセンサ１８、中間転写ベルト１９等が
配設されている。Next, the outline of the color image recording apparatus will be described. The writing optical unit 8 converts the color image data from the color scanner-1 into an optical signal, performs optical writing corresponding to the original image, and forms an electrostatic latent image on the photosensitive drum 9. The writing optical unit 8 is composed of a laser 8a, a polygon mirror 8b, a rotation motor 8c thereof, an f / θ lens 8d, a reflection mirror 8e, and the like. The photoconductor drum 9 of the printer unit 2 rotates counterclockwise,
Around it, a cleaning unit 10, a charge eliminating lamp 11, a charging device 12, a potential sensor 13, a black developing device 14, a cyan developing device 15, a magenta developing device 16, a yellow developing device 17, a P sensor 18, and an intermediate portion. A transfer belt 19 and the like are provided.
【０００９】次に、画像形成動作の概略を説明する。待
機状態では４つの現像器全てについて、現像スリ−ブ上
の現像剤の穂切りにより、現像スリ−ブ上の現像剤が感
光体上に接触しない状態にされ、現像不作動状態になっ
ている。コピ−動作が開始されると、カラ−スキャナ−
１で所定のタイミングからブラック画像デ−タの読み取
りがスタ−トし、この画像デ−タに基づきレ−ザ光によ
る光書き込み、潜像形成が始まる。ブラック潜像の先端
部から現像可能とすべくブラック現像器１４の現像位置
に潜像先端部が到達する前に、現像スリ−ブ１４ａを回
転開始して現像剤の穂立てを行い、ブラック潜像をブラ
ックトナ−で現像する。ブラック潜像の現像が終了する
と、ブラック現像スリ−ブ１４ａ上の穂切りを行う。Next, the outline of the image forming operation will be described. In the standby state, the developer on all the four developing devices is in a state in which the developer on the developing sleeve does not come into contact with the photoconductor due to the cutting off of the developer on the developing sleeve, and the developing is inoperative. . When the copy operation is started, the color scanner-
At 1, the reading of black image data is started from a predetermined timing, and the optical writing by the laser light and the latent image formation are started based on this image data. Before the latent image front end reaches the developing position of the black developing device 14 so that development can be performed from the front end of the black latent image, the developing sleeve 14a is started to rotate so that the developer spikes up. The image is developed with black toner. When the development of the black latent image is completed, the spikes on the black developing sleeve 14a are cut off.
【００１０】感光体９に形成したブラックトナ−像は、
感光体と等速駆動されている中間転写ベルト１９の表面
に転写する（以下、感光体から中間転写ベルトへの転写
をベルト転写という）。ベルト転写は、感光体９と中間
転写ベルト１９が接触状態において、転写バイアスロ−
ラ２０に所定のバイアス電圧を印加することで行う。中
間転写ベルト１９には、感光体９に順次形成するブラッ
ク、シアン、マゼンタ、イエロ−のトナ−像を同一面に
順次位置合わせして、４色重ねのベルト転写画像を形成
し、その後転写紙に一括転写を行う。The black toner image formed on the photoconductor 9 is
The image is transferred onto the surface of the intermediate transfer belt 19 that is driven at the same speed as the photoconductor (hereinafter, transfer from the photoconductor to the intermediate transfer belt is referred to as belt transfer). The belt transfer is performed by transferring the transfer bias when the photoconductor 9 and the intermediate transfer belt 19 are in contact with each other.
This is performed by applying a predetermined bias voltage to the laser 20. On the intermediate transfer belt 19, black, cyan, magenta, and yellow toner images sequentially formed on the photoconductor 9 are sequentially aligned on the same surface to form a four-color belt transfer image, and then the transfer paper. Batch transfer to.
【００１１】感光体９側ではブラック工程の次にシアン
工程に進むが、所定のタイミングからカラ−スキャナ−
１によるシアン画像デ−タ読み取りが始まり、その画像
デ−タによるレ−ザ書き込みでシアン潜像形成を行う。
シアン現像器１５はその現像位置に対して、先のブラッ
ク潜像後端部が通過した後で、シアン潜像の先端が到達
する前に現像スリ−ブ１５ａを回転開始して剤の穂立て
を行い、シアン潜像をシアントナ−で現像する。以後、
シアン潜像領域の現像を続け、潜像後端が通過した時点
で、先のブラック現像器の場合と同様にシアン現像スリ
−ブ１５ａ上の穂切りを行う。尚、マゼンタ、イエロ−
工程についても、それぞれの画像デ−タの読み取り、潜
像形成及び現像の動作が上述のブラック、シアン工程と
同様に行われる。On the side of the photoreceptor 9, the black process is followed by the cyan process, but the color scanner-scans from a predetermined timing.
Cyan image data reading by 1 is started, and a cyan latent image is formed by laser writing by the image data.
The cyan developing device 15 starts to rotate the developing sleeve 15a after the trailing edge of the previous black latent image has passed to the developing position and before the leading edge of the cyan latent image reaches the developing position so that the developer spikes. Then, the cyan latent image is developed with a cyan toner. After that,
The development of the cyan latent image area is continued, and when the trailing edge of the latent image passes, the spikes on the cyan developing sleeve 15a are cut as in the case of the previous black developing device. In addition, magenta, yellow
Regarding the steps, the operations of reading the respective image data, forming the latent image, and developing are performed in the same manner as the above-described black and cyan steps.
【００１２】ここで、中間転写ベルトユニットについて
説明する。中間転写ベルト１９は、駆動ロ−ラ２１、ベ
ルト転写バイアスロ−ラ２０、及び従動ロ−ラ群３０、
３１に張架されており、駆動モ−タにより駆動制御され
る。 ベルトクリ−ニングユニット２２は、入り口シ−
ル２２ａ、ゴムブレ−ド２２ｂ，及びベルトからの入り
口シ−ル及びゴムブレ−ド２２ｂの接離機構２２ｃ等で
構成されており、１色目のブラック画像をベルト転写し
た後の、２、３、４色目をベルト転写している間は、接
離機構２２ｃによってベルト面から入り口シ−ル２２ａ
及びゴムブレ−ド２２ｂを離間させておく。Now, the intermediate transfer belt unit will be described. The intermediate transfer belt 19 includes a drive roller 21, a belt transfer bias roller 20, and a driven roller group 30,
It is stretched around 31 and is driven and controlled by a driving motor. The belt cleaning unit 22 has an entrance seat.
And a rubber blade 22b, and a contact / separation mechanism 22c for the entrance seal from the belt and the rubber blade 22b. While the colors are being transferred onto the belt, the entrance / seal 22a is moved from the belt surface by the contact / separation mechanism 22c.
And the rubber blade 22b are separated from each other.
【００１３】紙転写ユニット２３は、紙転写バイアスロ
−ラ２３ａ、ロ−ラクリ−ニングブレ−ド２３ｂ、及び
ベルトからの接離機構２３ｃ等で構成されている。バイ
アスロ−ラ２３ａは、通常はベルト１９面から離間して
いるが、中間転写ベルト１９面に形成された４色の重ね
画像を転写紙に一括転写する時にタイミングを取って接
離機構２３ｃで押圧され、バイアスロ−ラ２３ａに所定
のバイアス電圧を印加して紙への転写を行う。尚、転写
紙２４は給紙ロ−ラ２５、レジストロ−ラ２６によっ
て、中間転写ベルト面の４色重ね画像の先端部が、紙転
写位置に到達するタイミングに合わせて給紙され、中間
転写ベルト１９上に形成されたブラック、シアン、マゼ
ンタ、イエロ−のトナ−像は、転写紙２４上に一括転写
される。その後転写紙２４は、紙搬送ユニット２７で定
着器２８に搬送され、定着ロ−ラ２８ａと加圧ロ−ラ２
８ｂでトナ−像が溶融定着され、コピ−トレイ２９に排
出される。The paper transfer unit 23 is composed of a paper transfer bias roller 23a, a roller cleaning blade 23b, a contact / separation mechanism 23c from the belt, and the like. The bias roller 23a is normally separated from the surface of the belt 19 but is pressed by the contact / separation mechanism 23c at a timing when the four-color superimposed images formed on the surface of the intermediate transfer belt 19 are collectively transferred to the transfer paper. Then, a predetermined bias voltage is applied to the bias roller 23a to transfer it to the paper. The transfer paper 24 is fed by a paper feed roller 25 and a registration roller 26 at the timing when the leading edge of the four-color superimposed image on the surface of the intermediate transfer belt reaches the paper transfer position. The toner images of black, cyan, magenta, and yellow formed on 19 are collectively transferred onto the transfer paper 24. After that, the transfer paper 24 is conveyed to the fixing device 28 by the paper conveying unit 27, and the fixing roller 28a and the pressure roller 2 are conveyed.
At 8b, the toner image is fused and fixed, and is discharged to the copy tray 29.
【００１４】尚、ベルト転写後の感光体９は、感光体ク
リ−ニングユニット１０で表面をクリ−ニングされ、除
電ランプ１１で均一に除電される。また、転写紙２４に
トナ−像を転写した後の中間転写ベルト１９は、クリ−
ニングユニット２２において、接離機構２２ｃによりゴ
ムブレ−ド２２ｂが押圧され、表面がクリ−ニングされ
る。The surface of the photoconductor 9 after the belt transfer is cleaned by the photoconductor cleaning unit 10 and uniformly discharged by the charge eliminating lamp 11. In addition, the intermediate transfer belt 19 after the toner image is transferred onto the transfer paper 24 is
In the training unit 22, the rubber blade 22b is pressed by the contacting / separating mechanism 22c to clean the surface.
【００１５】図３は、作像開始タイミングを決定するた
めのマ−クを形成した中間転写ベルトを示すものであ
る。尚、図１及び２と同一の部材には同一の番号を付し
ている。図３において、１９は中間転写ベルトであり、
中間転写ベルト１９は、透光性の材料により形成されて
いる。中間転写ベルト１９の非画像形成領域である端部
領域１９ａには、マ−クとしての切欠き部１９ｂが形成
されている。一方、この切欠き部１９ｃに対向する装置
本体側には、ＬＥＤ３２ａ及び受光素子３２ｂで構成さ
れるセンサ−３２が配設される。中間転写ベルト１９が
回転し、センサ−３２が中間転写ベルト１９の切欠き部
１９ｂを検出すると、受光部３２ｂは、検出信号を出力
する。FIG. 3 shows an intermediate transfer belt on which a mark for determining the image formation start timing is formed. The same members as those in FIGS. 1 and 2 are designated by the same reference numerals. In FIG. 3, 19 is an intermediate transfer belt,
The intermediate transfer belt 19 is made of a translucent material. A notch 19b as a mark is formed in an end region 19a which is a non-image forming region of the intermediate transfer belt 19. On the other hand, a sensor 32 including an LED 32a and a light receiving element 32b is arranged on the side of the apparatus body facing the cutout portion 19c. When the intermediate transfer belt 19 rotates and the sensor-32 detects the cutout portion 19b of the intermediate transfer belt 19, the light receiving portion 32b outputs a detection signal.
【００１６】図４は、中間転写ベルト１９のマ−ク１９
ｂをセンサ−３２が検出し、検出信号を出力した場合
の、この検出信号によって、書き込み光学ユニット８の
書き込み開始タイミングを決定するための制御ブロック
図を示す。図４において、センサ−３２から出力される
マ−ク検出信号が入力される制御手段３３は、その内部
にタイマ−を有している。３４は、制御手段３３からの
信号に基づいて書き込み開始信号を出力する書き込み開
始信号発生手段、３５は、書き込み光学系ユニット８の
一連の動作を制御するための書き込み制御手段を示す。FIG. 4 shows a mark 19 of the intermediate transfer belt 19.
A control block diagram for determining the writing start timing of the writing optical unit 8 by the detection signal when the sensor-32 detects b and outputs the detection signal is shown. In FIG. 4, the control means 33 to which the mark detection signal output from the sensor 32 is input has a timer therein. Reference numeral 34 is a writing start signal generating means for outputting a writing start signal based on a signal from the control means 33, and 35 is a writing control means for controlling a series of operations of the writing optical system unit 8.
【００１７】いま、センサ−３２からマ−ク検出信号が
出力されると、この信号は、制御手段３３に入力され
る。このマ−ク検出信号をトリガ−として制御手段３３
内のタイマ−がカウントを開始し、所定のパルス数をカ
ウントしたら、書き込み開始信号発生手段３４に制御信
号を出力する。この所定時間は、ブラック、シアン、マ
ゼンタ、イエロ−各色で全て同一の時間が設定されてい
る。書き込み開始信号発生手段３４は、制御手段３３か
らの制御信号が入力されたと同時に書き込み開始信号を
出力し、この書き込み開始信号の出力に応じて書き込み
光学ユニット８のレ−ザ８ａがその発光を開始する。従
って、潜像先端位置から各色トナ−像の中間転写ベルト
への転写位置までの距離は各色間で全て同一となり、多
重転写時の色ズレが防止できる。Now, when a mark detection signal is output from the sensor 32, this signal is input to the control means 33. The control means 33 uses this mark detection signal as a trigger.
When a timer therein starts counting and counting a predetermined number of pulses, it outputs a control signal to the write start signal generating means 34. The predetermined time is the same for all colors of black, cyan, magenta and yellow. The writing start signal generation means 34 outputs a writing start signal at the same time when the control signal from the control means 33 is input, and the laser 8a of the writing optical unit 8 starts its light emission in response to the output of this writing start signal. To do. Therefore, the distance from the leading end position of the latent image to the transfer position of each color toner image on the intermediate transfer belt is the same for each color, and color misregistration during multiple transfer can be prevented.
【００１８】図４では、中間転写ベルトに透光性の領域
を有するベルトを用い、透過型センサ−で中間転写ベル
ト上のマ−クを検出する実施例を説明したが、これに変
えて、中間転写ベルトが非透光性の場合には、中間転写
ベルト１９の内面側端部領域に反射型のフォトセンサ−
を配設してもよい。さらに他の実施例として、中間転写
ベルトの端部領域にゴム磁石を接着し、磁気センサ−に
よって、このゴム磁石の位置を検出するもの、それとは
逆に、中間転写ベルトの端部領域をマ−ク部分を除いて
ゴム磁石とし、磁気センサ−で非磁性部分を検出するよ
うにすることも可能である。In FIG. 4, an embodiment in which a belt having a light transmissive region is used as the intermediate transfer belt and the mark on the intermediate transfer belt is detected by the transmission type sensor has been described. When the intermediate transfer belt is non-translucent, a reflection type photo sensor is provided on the inner surface side end area of the intermediate transfer belt 19.
May be provided. In still another embodiment, a rubber magnet is adhered to the end area of the intermediate transfer belt, and the position of this rubber magnet is detected by a magnetic sensor. It is also possible to use a rubber magnet excluding the black part and detect the non-magnetic part with a magnetic sensor.
【００１９】以上、本実施例によれば、感光体９から中
間転写ベルト１９への各色トナ−像の多重転写時の位置
ズレが防止できる。As described above, according to this embodiment, it is possible to prevent the positional deviation during the multiple transfer of the toner images of the respective colors from the photoconductor 9 to the intermediate transfer belt 19.
【００２０】以上本発明によれば、中間転写ベルト上に
形成されたマ−クを検出し、このマ−ク検出をトリガと
して画像信号の書き込みを開始するので、潜像又はトナ
−像先端から中間転写ベルトへの転写位置までの距離が
各色間で全て等しくなり、多重転写時の位置ズレの発生
が防止できる。As described above, according to the present invention, the mark formed on the intermediate transfer belt is detected and the image signal writing is started by using this mark detection as a trigger. The distance to the transfer position on the intermediate transfer belt is the same for all colors, and it is possible to prevent the occurrence of positional deviation during multiple transfer.
【図１】本実施例のカラ−複写装置の感光体・転写ベル
ト回りの拡大図。FIG. 1 is an enlarged view around a photosensitive member and a transfer belt of a color copying apparatus of this embodiment.
【図２】本実施例のカラ−複写装置の概略構成図。FIG. 2 is a schematic configuration diagram of a color copying apparatus of this embodiment.
【図３】中間転写ベルト上に形成したマ−クを表す図。FIG. 3 is a diagram showing a mark formed on an intermediate transfer belt.
【図４】書き込み開始タイミング決定のための制御ブロ
ック図。FIG. 4 is a control block diagram for determining a write start timing.
８ 書き込み光学ユニット １９ 中間転写ベルト １９ｂ マ−ク ３２ センサ− ３３ 制御手段 ３４ 書き込み開始信号発生手段 ３５ 書き込み制御手段 8 Writing Optical Unit 19 Intermediate Transfer Belt 19b Mark 32 Sensor 33 Control Means 34 Writing Start Signal Generating Means 35 Writing Control Means
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０３Ｇ 15/16 21/14 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location G03G 15/16 21/14
Claims (2)
電潜像を形成する手段と、前記静電潜像を各色分解像と
補色関係にあるトナ−で現像する手段と、中間転写ベル
トと、前記トナ−像を前記中間転写ベルト上に転写する
手段と、前記中間転写ベルト上のトナ−像を転写紙上に
転写する手段とを有するカラ−画像形成装置において、 前記中間転写ベルト上の所定位置に形成されたマ−ク
と、前記マ−クを検出する検出手段と、前記マ−ク検出
手段からの検出信号に基づき前記静電潜像形成手段の動
作開始タイミングを制御する制御手段とを有することを
特徴とするカラ−画像形成装置。1. A photoreceptor, means for forming a color-separated electrostatic latent image on the photoreceptor, means for developing the electrostatic latent image by a toner having a complementary color relationship with each color-separated image, and A color image forming apparatus comprising: a transfer belt; a means for transferring the toner image onto the intermediate transfer belt; and a means for transferring the toner image on the intermediate transfer belt onto a transfer paper. The operation start timing of the electrostatic latent image forming means is controlled based on the mark formed at the upper predetermined position, the detecting means for detecting the mark, and the detection signal from the mark detecting means. A color image forming apparatus comprising: a control unit.
入力画像に応じた光画像を書き込む光画像書き込み手段
を含み、前記制御手段は、前記光画像書き込み手段の書
き込み開始タイミングを決定することを特徴とする請求
項１記載のカラ−画像形成装置。2. The electrostatic latent image forming means includes an optical image writing means for writing an optical image according to an input image on the photoconductor, and the control means determines a writing start timing of the optical image writing means. The color image forming apparatus according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5233374A JPH0792763A (en) | 1993-09-20 | 1993-09-20 | Color image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5233374A JPH0792763A (en) | 1993-09-20 | 1993-09-20 | Color image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0792763A true JPH0792763A (en) | 1995-04-07 |
Family
ID=16954112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5233374A Pending JPH0792763A (en) | 1993-09-20 | 1993-09-20 | Color image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0792763A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5697031A (en) * | 1995-08-04 | 1997-12-09 | Ricoh Company, Ltd. | Image forming apparatus and method for overlaid transfer of images |
| US5765083A (en) * | 1996-02-26 | 1998-06-09 | Ricoh Company, Ltd. | Color image forming apparatus with reduced positional deviation |
| US7092651B2 (en) | 2003-01-31 | 2006-08-15 | Canon Kabushiki Kaisha | Image forming apparatus method and storage device storing a program for controlling image forming operation of primarily transferring an image onto an intermediate transfer member |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6157947A (en) * | 1984-08-29 | 1986-03-25 | Ricoh Co Ltd | Belt-shaped photosensitive body |
| JPS62124569A (en) * | 1985-11-26 | 1987-06-05 | Ricoh Co Ltd | Image forming device |
| JPH04345457A (en) * | 1991-05-23 | 1992-12-01 | Mitsubishi Petrochem Co Ltd | Seamless belt |
| JPH0535124A (en) * | 1991-07-29 | 1993-02-12 | Sharp Corp | Electrophotographic copying machine |
| JPH05150574A (en) * | 1991-11-28 | 1993-06-18 | Matsushita Electric Ind Co Ltd | Electrophotographic device |
-
1993
- 1993-09-20 JP JP5233374A patent/JPH0792763A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6157947A (en) * | 1984-08-29 | 1986-03-25 | Ricoh Co Ltd | Belt-shaped photosensitive body |
| JPS62124569A (en) * | 1985-11-26 | 1987-06-05 | Ricoh Co Ltd | Image forming device |
| JPH04345457A (en) * | 1991-05-23 | 1992-12-01 | Mitsubishi Petrochem Co Ltd | Seamless belt |
| JPH0535124A (en) * | 1991-07-29 | 1993-02-12 | Sharp Corp | Electrophotographic copying machine |
| JPH05150574A (en) * | 1991-11-28 | 1993-06-18 | Matsushita Electric Ind Co Ltd | Electrophotographic device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5697031A (en) * | 1995-08-04 | 1997-12-09 | Ricoh Company, Ltd. | Image forming apparatus and method for overlaid transfer of images |
| US5765083A (en) * | 1996-02-26 | 1998-06-09 | Ricoh Company, Ltd. | Color image forming apparatus with reduced positional deviation |
| US7092651B2 (en) | 2003-01-31 | 2006-08-15 | Canon Kabushiki Kaisha | Image forming apparatus method and storage device storing a program for controlling image forming operation of primarily transferring an image onto an intermediate transfer member |
| US7197255B2 (en) | 2003-01-31 | 2007-03-27 | Canon Kabushiki Kaisha | Image forming apparatus and method for controlling an image forming operation of primarily transferring an image onto an intermediate transfer member |
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