JPS63149662A - Color image forming device - Google Patents
Color image forming deviceInfo
- Publication number
- JPS63149662A JPS63149662A JP61297223A JP29722386A JPS63149662A JP S63149662 A JPS63149662 A JP S63149662A JP 61297223 A JP61297223 A JP 61297223A JP 29722386 A JP29722386 A JP 29722386A JP S63149662 A JPS63149662 A JP S63149662A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- image
- color
- image forming
- images
- 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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Links
- 238000012546 transfer Methods 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 20
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 108091008695 photoreceptors Proteins 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Color Electrophotography (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
−Ｆのｐ ノ）！
本発明は、各色毎に像担持体Ｆに潜像を形成し、該潜像
を選択された任意の色現像器にて可視化し、該ｏｆ視両
画像同一の転写材に順次重ね転写するようにしたカラー
画像形成装置に関するものである。[Detailed Description of the Invention] -F pノ)! In the present invention, a latent image is formed on the image carrier F for each color, the latent image is visualized using a selected color developer, and the two images are sequentially superimposed and transferred onto the same transfer material. The present invention relates to a color image forming apparatus.
従ｊＥ例」Ｌ術
従来、多色原稿を複写するべくカラー画像形成装置が種
々に提案されているが、その中で多用されているものは
カラー電子写真複写装置であり。Conventionally, various color image forming apparatuses have been proposed for copying multicolor originals, and among them, color electrophotographic copying apparatuses are widely used.
特に複数の画像形成部を備え、各画像形成部にてそれぞ
れ色の異なったトナー像を形成し、該トナー像を同一転
写材に順次重ね転写するカラー電子写真複写装芒である
。In particular, it is a color electrophotographic copying device that includes a plurality of image forming sections, each of which forms toner images of different colors, and sequentially transfers the toner images onto the same transfer material in an overlapping manner.
斯るカラー複写装置の一例を第２図に基づいて筒中に説
明すると、カラー複写装置の装２本体内には第１．第２
．第３及び第４画像形Ｉ＆部Ｐａ。An example of such a color copying apparatus will be explained based on FIG. Second
．． Third and fourth image form I & part Pa.
Ｐｂ、Ｐｃ及びＰｄが並設される。該画像形成部Ｐａ、
Ｐｂ、Ｐｃ及びＰｄはそれぞれ１ダ用の像担特休１本例
では電子写真感光ドラム１ａ、１ｂ、ｌｃ及びｌｄを具
備する。Pb, Pc and Pd are arranged in parallel. the image forming section Pa;
Pb, Pc, and Pd are each equipped with one image carrier for one image, and in this example, electrophotographic photosensitive drums 1a, 1b, lc, and ld.
感光ドラムｌａ、ｌｂ、ｌｃ及びｌｄは、その外周側に
潜像形成部２ａ、２ｂ、２ｃ、２ｄ、現像部３ａ、３ｂ
、３ｃ、３ｄ、転写用放電部４ａ、４ｂ、４ｃ、４ｄ及
びクリーニング部５ａ。The photosensitive drums la, lb, lc, and ld have latent image forming sections 2a, 2b, 2c, and 2d, and developing sections 3a and 3b on their outer peripheral sides.
, 3c, 3d, transfer discharge parts 4a, 4b, 4c, 4d, and cleaning part 5a.
５ｂ、５ｃ、５ｄが配置される。5b, 5c, and 5d are arranged.
斯る構成にて、先ず第１画像形成部Ｐａの感光ドラムｌ
ａ上に潜像形成部２ａにより原稿画像におけるイエロー
成分色の潜像が形成される。該潜像は現像部３ａのイエ
ロートナーを有する現像剤で可視画像とされ、転写部４
ａにて該イエロートナー像は転写材６に転写される。In such a configuration, first, the photosensitive drum l of the first image forming section Pa is
A latent image of the yellow component color of the original image is formed by the latent image forming section 2a on the document image a. The latent image is made into a visible image by a developer containing yellow toner in the developing section 3a, and then transferred to the transfer section 4.
The yellow toner image is transferred to the transfer material 6 at step a.
一方、上記のようにイエロー画像が転写材に転写されて
いる間に、第２画像形成部Ｐｂではマゼンタ成分色の潜
像が形成され、続いて現像部３ｂでマゼンタトナーによ
るトナー像が得られる。該マゼンタトナー像は、上記の
第１画像形成部Ｐａでの転写が終了した転写材６が転写
部４ｂに搬入されたとき、該転写材６の所定位置に転写
される。On the other hand, while the yellow image is being transferred to the transfer material as described above, a latent image of magenta component color is formed in the second image forming section Pb, and then a toner image with magenta toner is obtained in the developing section 3b. . The magenta toner image is transferred to a predetermined position on the transfer material 6 when the transfer material 6, which has been transferred at the first image forming section Pa, is carried into the transfer section 4b.
以ド、−上記と同様な方法により第３、第４画像形成部
Ｐｃ、Ｐｄによってシアン色、ブラック色の画像形成が
行なわれ、上記同一の転写材に該シアン色、ブラック色
が所定位置に転写される。このような画像形成プロセス
が終了すると、転写材上の画像は定着部７で転写材に定
着され多色画像が？’）られる、一方転写が終了し、た
各感光ドラム１ａ、ｌｂ、ｌｃ、ｌｄはクリーニング部
５ ａ ｔ、 ５ｂ、５ｃ、５ｄにより残留トナーが除
去され、引き続き行なわれる次の潜像形成に備えられる
。Thereafter, cyan and black images are formed by the third and fourth image forming sections Pc and Pd in the same manner as above, and the cyan and black images are placed at predetermined positions on the same transfer material. transcribed. When such an image forming process is completed, the image on the transfer material is fixed to the transfer material by the fixing section 7 to form a multicolor image. On the other hand, the transfer is completed, and the remaining toner is removed from each of the photosensitive drums 1a, lb, lc, and ld by cleaning sections 5a, 5b, 5c, and 5d, in preparation for the next latent image formation to be performed subsequently. It will be done.
上記構成の画像形成装置においては、転写材６は搬送ベ
ルト８にて第４図で右側から左側へ搬送され、搬送ベル
ト８と共に移動し各画像形成部Ｐａ、Ｐｂ、Ｐｃ、Ｐｄ
の転写部４ａ、４ｂ、４ｃ、４ｄを通過するように構成
される。In the image forming apparatus having the above configuration, the transfer material 6 is transported by the transport belt 8 from the right side to the left side in FIG.
It is configured to pass through transfer sections 4a, 4b, 4c, and 4d.
が −。 古
ところが本発明者等の研究実験によると、上記構成の画
像形成装置において、特に文字、ハーフトーン画像が混
在した原稿画像を複写する場合には、各色に要求される
解像度は異なり、ブラック色、シアン色、マゼンタ色、
イエロー色の順、或いはブラック色、マゼンタ色、シア
ン色、イエロー色の順で高い空間周波数、つまり高い解
像度が必要とされることが分かった。But −. However, according to research experiments conducted by the present inventors, when copying an original image containing a mixture of characters and halftone images using an image forming apparatus having the above configuration, the resolution required for each color is different, and the resolution required for each color is different. cyan, magenta,
It has been found that a high spatial frequency, that is, a high resolution, is required in the order of yellow, black, magenta, cyan, and yellow.
又、例えば帯電、露光、現像、転写工程から成るカール
ソンプロセスによる電子写真法においては、一般に、潜
像形成時における解像度は現像工程電絡えた感光体上の
可視画像となった時点での解像度に比べてはるかに高い
ことが分かつている。具体的に言えば、潜像形成時にお
ける解像度は１００木／ ｍ ｍ以北であるのに対し、
現像工程終了時における解像度は現像剤（トナー）粒子
３個分相当の解像力、即ち粒径１２ｐｍのトナーを用い
た場合には３０本／ ｍ ｍ程度より高い解像力を得る
ことは困難であった。In addition, for example, in electrophotography using the Carlson process, which consists of charging, exposure, development, and transfer steps, the resolution at the time of forming a latent image is generally the same as the resolution at the time when the developing process becomes a visible image on the photoreceptor. It is known that it is much higher. Specifically, while the resolution at the time of latent image formation is north of 100 mm/mm,
The resolution at the end of the development process is equivalent to three developer (toner) particles, that is, when toner with a particle size of 12 pm is used, it is difficult to obtain a resolution higher than about 30 lines/mm.
一方、従来のカラー電子写真複写装置においては、各色
現像器とも同一の平均粒Ｐｉｔｅ有した現像剤を用いて
おり、そのために各色共にその解像度は現像剤に依存し
たものとなり、限界解像度は同じとされ、Ｅ述のように
色違いによる必要解像度を達成し得るものではなかった
。つまり、各色現像剤の粒径を、イエロー色の画像再現
に必要な解像度に合せた幾分粒径の大きなものとした場
合には、ブラック色の画像再現時の必要解像度を満足し
得ず、又各色現像剤の粒径をブラック色の画像再現のた
めの解像度に合せて小さくすれば、ブラック色の色再現
は達成されるが、微粒現像剤は現像剤が被覆したｔに微
粒現像剤を転写した場合に転写効率が悪くなるという特
性を有するために。On the other hand, in the conventional color electrophotographic copying apparatus, each color developing device uses a developer having the same average particle size, so the resolution of each color depends on the developer, and the limit resolution is the same. However, as mentioned in E, it was not possible to achieve the required resolution due to the difference in color. In other words, if the particle size of each color developer is made somewhat larger than the resolution required to reproduce a yellow image, the required resolution for black image reproduction cannot be satisfied. In addition, if the particle size of each color developer is made small to match the resolution for black image reproduction, black color reproduction can be achieved, but fine particle developer does not apply fine particle developer to the area covered by the developer. This is because it has the characteristic that the transfer efficiency deteriorates when it is transferred.
問題があった。更に、微粒現像剤は高価格であるために
、各色共微粒現像剤を用いることはランニングコストの
面からも好ましいものではなかった。There was a problem. Furthermore, since fine grain developers are expensive, it has not been preferable to use fine grain developers for each color in terms of running costs.
介ｆｆｌの
本発明の目的は、色再現に必要な解像度を達成すること
ができ、高品質のカラー画像を得ることができ、ｌ］、
ウランニゲコストも低廉であるカラー画像形成装置を提
供することである。The purpose of the present invention is to be able to achieve the resolution necessary for color reproduction and obtain high quality color images;
It is an object of the present invention to provide a color image forming apparatus that is inexpensive.
１八１与 るため −二
Ｌ記目的は本発明に係るカラー画像形成装置にて達成さ
れる。要約すれば本発明は、各色毎に像担持体りに潜像
を形成し、該潜像を選択された任意の色現像器にて可視
化し、該可視画像を同一の転写材に順次重ね転写するよ
うにしたカラー画像形成装置において、前記現像器のう
ちの少なくとも一つの現像器が収容した現像剤の平均粒
径は他の現像器が収容した現像剤の平均粒径と異なるも
のとし、更に前記現像器による潜像の可視化は、現像剤
の平均粒径の小さいものの順に行なうようにしたことを
特徴とするカラー画像形成装置である。好ましくは、ブ
ラック色の現像剤が他の現像剤より平均粒径が小さくさ
れる。181 The object of -2L is achieved by the color image forming apparatus according to the present invention. In summary, the present invention forms a latent image for each color on an image carrier, visualizes the latent image using a selected color developer, and sequentially transfers the visible image onto the same transfer material. In the color image forming apparatus, the average particle size of the developer contained in at least one of the developing devices is different from the average particle size of the developer contained in the other developing devices, and further The color image forming apparatus is characterized in that the latent image is visualized by the developer in the order of developer having a smaller average particle size. Preferably, the black developer has a smaller average particle size than the other developers.
支１ｊ
次に、本発明に係る画像形成装置の一実施例を図面に即
して更に詳しく説明する。Support 1j Next, an embodiment of the image forming apparatus according to the present invention will be described in more detail with reference to the drawings.
第１図を参照すると１本発明は第２図に関連して説明し
たと同様のカラー電子写真複写装置に具現化されている
。つまり１本発明に係る画像形成装置は、装置本体ｌＯ
内に画像形成部Ｐａ、Ｐｂ、Ｐｃ、Ｐｄが配ｌされ、該
画像形成部の下方に駆動ローラ１１．１２及び７６並び
に該ローラに巻回された搬送ベルト８から成る転写材搬
送手段が設けられ、該搬送ベルト８は矢印方向に回動さ
れる。Referring to FIG. 1, the present invention is embodied in a color electrophotographic reproduction apparatus similar to that described in connection with FIG. In other words, the image forming apparatus according to the present invention has an apparatus main body lO
Image forming sections Pa, Pb, Pc, and Pd are disposed within the image forming section, and a transfer material conveying means consisting of drive rollers 11, 12 and 76 and a conveying belt 8 wound around the rollers is provided below the image forming section. and the conveyor belt 8 is rotated in the direction of the arrow.
第２図にて、搬送ベルト８の右側には給紙機構１３が配
置され、該給紙機構１３を介して転写材６が搬送ベルト
８上に送り込まれる。各画像形成部Ｐａ、Ｐｂ、Ｐｃ、
Ｐｄにて転写が終了した転写材６は搬送ベルト８の左側
から定着器７へと送出される。定着された転写材６は排
出口１４から装置本体ｌＯ外へと排出される。In FIG. 2, a paper feed mechanism 13 is arranged on the right side of the conveyor belt 8, and the transfer material 6 is fed onto the conveyor belt 8 via the paper feed mechanism 13. Each image forming section Pa, Pb, Pc,
The transfer material 6 whose transfer has been completed at Pd is sent to the fixing device 7 from the left side of the conveyor belt 8. The fixed transfer material 6 is discharged from the discharge port 14 to the outside of the apparatus main body IO.
搬送ベルト８の上方に並設された第１．第２゜第３及び
第４画像形成部Ｐａ、Ｐｂ、Ｐｃ及びＰｄは感光ドラム
ｌａ、ｌｂ、ｌｃ及び１ｄを有し、該感光ドラムｌａ、
ｌｂ、ＩＣ及びｌｄのそれぞれの上部左側に帯電器１５
ａ、１５ｂ、１５Ｃ及び１５ｄが設けられる。The first... 2nd degree The third and fourth image forming sections Pa, Pb, Pc, and Pd have photosensitive drums la, lb, lc, and 1d, and the photosensitive drums la,
A charger 15 is installed on the upper left side of each of lb, IC, and ld.
a, 15b, 15C and 15d are provided.
又、感光ドラムｌａ、ｌｂ、ｌｃ、ｌｄはそのＬ部にレ
ーザービームｌｅａ、１６ｂ、ｌｅｅ。Further, the photosensitive drums la, lb, lc, and ld have laser beams lea, 16b, and lee on their L portions.
１６ｄがそれぞれ配設される。これらレーザービームス
キャナｌｅａ、１６ｂ、１６ｃ、ｌｅｄは半導体レーザ
ー、ポリゴンミラー、ｆθレンズ等からなり、電気デジ
タル画像信号の入力を受け。16d are arranged respectively. These laser beam scanners lea, 16b, 16c, and LED are composed of semiconductor lasers, polygon mirrors, fθ lenses, etc., and receive input of electric digital image signals.
その信号に対応して変調されたレーザービームを帯電器
１５ａ、１５ｂ、１５ｃ、１５ｄと現像器３ａ、３ｂ、
３ｃ、３ｄとの間で感光ドラムｌａ、ｌｂ、ｌｃ、ｌｄ
の母線方向に走査してこれらを露光するように形成され
ている。A laser beam modulated in accordance with the signal is applied to chargers 15a, 15b, 15c, 15d and developing devices 3a, 3b.
Between 3c and 3d, photosensitive drums la, lb, lc, ld
These are exposed by scanning in the direction of the generatrix.
詳述すると、第１画像形成部Ｐａのレーザースキャナｌ
ｅａには、カラー画像のブラック成分像に対応する画素
信号が、第２画像形成部Ｐｂのレーザースキャナ１６ｂ
にはマゼンタ成分像に対応する画素信号がそれぞれ入力
され、そして、第３画像形成部Ｐｃのレーデ−スキャナ
１６ｃと第４画像形成部Ｐｄのレーザースキャナ１６ｄ
には。To explain in detail, the laser scanner l of the first image forming section Pa
In ea, a pixel signal corresponding to the black component image of the color image is transmitted to the laser scanner 16b of the second image forming section Pb.
Pixel signals corresponding to the magenta component image are respectively input to the radar scanner 16c of the third image forming section Pc and the laser scanner 16d of the fourth image forming section Pd.
for.
シアン成分像に対応する画素信号とイエロー成分像に対
応する画素信号とがそれぞれ入力される。A pixel signal corresponding to a cyan component image and a pixel signal corresponding to a yellow component image are respectively input.
前記給紙機構１３は給紙ガイド５１とセンサー５２とを
備え、転写材６が給紙ガイド５１に挿入されると、その
先端をセンサー５２が検知して。The paper feed mechanism 13 includes a paper feed guide 51 and a sensor 52. When the transfer material 6 is inserted into the paper feed guide 51, the sensor 52 detects the leading edge of the transfer material 6.
感光ドラムｌａ、ｌｂ、ｌｃ、ｌｄへ回転始動の信号を
送り、同時に駆動ローラ１１．１２．９６も駆動し搬送
ベルト８を回動させる。又、搬送ベルト８へ給紙された
転写材６は吸着用帯電器５９．６２からコロナ放電を受
は搬送ベルト８の表面に確実に吸着される０本実施例で
は吸着帯電器５９．６２の高電圧の極性は互いに反対に
なるように設定し、＊１器６２は転写帯電器４ａ、４ｂ
、４ｃ、４ｄと同極性とされる。A rotation start signal is sent to the photosensitive drums la, lb, lc, and ld, and at the same time, the drive rollers 11, 12, and 96 are also driven to rotate the conveyor belt 8. In addition, the transfer material 6 fed to the conveyor belt 8 receives corona discharge from the attraction charger 59.62, and is reliably attracted to the surface of the conveyor belt 8. In this embodiment, the attraction charger 59.62 The polarities of the high voltages are set to be opposite to each other, and *1 device 62 is the transfer charger 4a, 4b.
, 4c, and 4d.
転写紙６の先端が各センサー６０ａ、６０ｂ。The leading edge of the transfer paper 6 is each sensor 60a, 60b.
６０ｃ、６０ｄを遮断すると、その信号により回転中の
感光ドラムｌａ、ｌｂ、ｌｃ、１ｄに対する画像形成が
順次開始される。転写材６がｔｉ４４画像形成部Ｐｄを
通過すると、ＡＣ電圧を加えられた除電３６１により転
写材６は除電され搬送ベルト８から分離される。When 60c and 60d are shut off, image formation on the rotating photosensitive drums la, lb, lc, and 1d is sequentially started based on the signal. When the transfer material 6 passes through the ti44 image forming section Pd, the transfer material 6 is charged and separated from the conveyor belt 8 by a charge remover 361 to which an AC voltage is applied.
、次に転写材６は定Ｒ器７に入り画像定着を行なった後
２排出口１４から排出される。Next, the transfer material 6 enters the fixing device 7 and is discharged from the second discharge port 14 after the image is fixed.
°更に、本発明の特徴部分の一つを構成する各現像器３
ａ、３ｂ、３ｃ、３ｄについて説明すれば、本実施例で
はブラック色現像器３ａに収容された現像剤（トナー）
の平均粒径は６ＩＬｍとされ、他の現像器３ｂ、３ｃ、
３ｄのマゼンタ色、シアン色、イエロー色トナーの平均
粒径は１２ｇｍとされた。斯る現像器’３ａ、３ｂ、３
ｃ、３ｄを使用することにより高い解像度を必要とする
文字部、ライン部の色再現性が向上し、良好な品質の画
像が得られた。Further, each developing device 3 constituting one of the characteristic parts of the present invention
To explain about a, 3b, 3c, and 3d, in this embodiment, the developer (toner) accommodated in the black color developing device 3a
The average particle size of the developing devices 3b, 3c, and
The average particle size of the 3D magenta, cyan, and yellow toners was 12 gm. Such developing devices '3a, 3b, 3
By using C and 3D, the color reproducibility of text and line areas that require high resolution was improved, and images of good quality were obtained.
本発明に係る画像形成装置は、上述の構成のカラー電子
写真複写装置に限定されるものではなく、例えば一つの
電子写真感光体を具備し、該感光体の周囲に帯電器、レ
ーザービームスキャナの如き露光手段、複数の現像器、
転写手段、クリーニング手段を配置し、各色毎に感光体
に潜像を形成し、選択された任意の現像器にて潜像を可
視化し、可視化された各色画像を同一の転写材に転写手
段にて重ね転写するように構成されたカラー画像形成装
置とすることもできる。勿論、露光手段はレーザービー
ムを使用したデジタル光学系に限定されるものではなく
、通常のアナログ式の露光光学系を使用することもでき
る。The image forming apparatus according to the present invention is not limited to the color electrophotographic copying apparatus having the above-described configuration, but may include, for example, one electrophotographic photoreceptor, a charger and a laser beam scanner around the photoreceptor. an exposure means such as, a plurality of developing devices,
A transfer means and a cleaning means are arranged, a latent image is formed on the photoreceptor for each color, the latent image is visualized with a selected arbitrary developer, and the visualized color image is transferred to the same transfer material on the transfer means. It is also possible to provide a color image forming apparatus configured to perform overlapping transfer. Of course, the exposure means is not limited to a digital optical system using a laser beam, and a normal analog exposure optical system can also be used.
又１本発明においては、各現像器による現像の順序は、
上述のように、ブラック色、マゼンタ色、シアン色、イ
エロー色の順とする代りにブラック色、シアン色、マゼ
ンタ色、イエロー色の順としても同様の効果が得られる
ことが実験的に分かった。In addition, in the present invention, the order of development by each developing device is as follows:
As mentioned above, it was experimentally found that instead of using the order of black, magenta, cyan, and yellow, the same effect could be obtained by using the order of black, cyan, magenta, and yellow. .
兄」ＬΩ」Ｅ里
以上の如くに構成される本発明に係る°画像形成装置は
、現像器のうちの少なくとも一つの現像器が収容した現
像剤の平均粒径を他の現像器が収容した現像、剤の平均
粒径とは異なるものとし、更に現像器による潜像の可視
化は、現像剤の平均粒径の小さいものの順に行なうよう
にしたことにより資格に適応した必要な解像力を無駄な
く実現することができ、高品質のカラー画像を得ること
ができ、更にはランニングコストも低廉であるという利
益を提供する。The image forming apparatus according to the present invention configured as described above has an average particle size of the developer contained in at least one of the developing devices, which is equal to the average particle size of the developer contained in at least one of the developing devices. The average particle size of the developing agent is different from the average particle size of the developer, and the latent image is visualized using the developing device in the order of the average particle size of the developer, thereby achieving the necessary resolving power suitable for the qualification without waste. The present invention provides the advantages of being able to obtain high-quality color images and having low running costs.
第１図は１本発明に係る画像形成装置の一実施例の概略
断面図である。
第２図は、従来の画像形成装置の概略断面図である。
Ｐａ、Ｐｂ、Ｐｃ、Ｐｄ：画像形成部
ｌａ、ｌｂ、ｌｃ、ｌｄ：像担持体
３ａ、３ｂ、３ｃ、３ｄ：現像器
第１図
第２図FIG. 1 is a schematic sectional view of an embodiment of an image forming apparatus according to the present invention. FIG. 2 is a schematic cross-sectional view of a conventional image forming apparatus. Pa, Pb, Pc, Pd: Image forming sections la, lb, lc, ld: Image carriers 3a, 3b, 3c, 3d: Developing device Fig. 1 Fig. 2
Claims (1)
された任意の色現像器にて可視化し、該可視画像を同一
の転写材に順次重ね転写するようにしたカラー画像形成
装置において、前記現像器のうちの少なくとも一つの現
像器が収容した現像剤の平均粒径は他の現像器が収容し
た現像剤の平均粒径と異なるものとし、更に前記現像器
による潜像の可視化は、現像剤の平均粒径の小さいもの
の順に行なうようにしたことを特徴とするカラー画像形
成装置。 ２）ブラック色の現像剤が他の現像剤より平均粒径が小
さくされて成る特許請求の範囲第１項記載の装置。[Claims] 1) Forming a latent image for each color on an image carrier, visualizing the latent image using a selected color developer, and sequentially overlapping the visible image on the same transfer material. In the color image forming apparatus configured to perform transfer, the average particle size of the developer contained in at least one of the developing devices is different from the average particle size of the developer contained in the other developing devices, Furthermore, the color image forming apparatus is characterized in that the latent image is visualized by the developer in the order of developer having a smaller average particle size. 2) The device according to claim 1, wherein the black developer has a smaller average particle size than other developers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61297223A JPH07113790B2 (en) | 1986-12-12 | 1986-12-12 | Color image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61297223A JPH07113790B2 (en) | 1986-12-12 | 1986-12-12 | Color image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63149662A true JPS63149662A (en) | 1988-06-22 |
| JPH07113790B2 JPH07113790B2 (en) | 1995-12-06 |
Family
ID=17843767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61297223A Expired - Fee Related JPH07113790B2 (en) | 1986-12-12 | 1986-12-12 | Color image forming apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07113790B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019197211A (en) * | 2018-05-08 | 2019-11-14 | キヤノン株式会社 | Image forming apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54126039A (en) * | 1978-02-17 | 1979-09-29 | Toshiba Corp | Magnetic toner |
| JPS55100573A (en) * | 1979-01-24 | 1980-07-31 | Ricoh Co Ltd | Multicolor electrophotographic copying method |
| JPS55120046A (en) * | 1979-03-09 | 1980-09-16 | Canon Inc | Developing method |
| JPS60186874A (en) * | 1984-03-07 | 1985-09-24 | Fuji Xerox Co Ltd | Colored electrophotographic method |
-
1986
- 1986-12-12 JP JP61297223A patent/JPH07113790B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54126039A (en) * | 1978-02-17 | 1979-09-29 | Toshiba Corp | Magnetic toner |
| JPS55100573A (en) * | 1979-01-24 | 1980-07-31 | Ricoh Co Ltd | Multicolor electrophotographic copying method |
| JPS55120046A (en) * | 1979-03-09 | 1980-09-16 | Canon Inc | Developing method |
| JPS60186874A (en) * | 1984-03-07 | 1985-09-24 | Fuji Xerox Co Ltd | Colored electrophotographic method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019197211A (en) * | 2018-05-08 | 2019-11-14 | キヤノン株式会社 | Image forming apparatus |
| US11988973B2 (en) | 2018-05-08 | 2024-05-21 | Canon Kabushiki Kaisha | Image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07113790B2 (en) | 1995-12-06 |
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| LAPS | Cancellation because of no payment of annual fees |