Novel Color Electrophotography by “ One Drum Color Superimposing Process ”

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  • YAMAMOTO Hajime
    Matsushita Electric Industrial Co., Ltd., Central Research Laboratories, Electro-Mechanics Group
  • TAKASHIMA Yuji
    Matsushita Electric Industrial Co., Ltd., Central Research Laboratories, Electro-Mechanics Group
  • KUNISHIGE Hidenori
    Matsushita Electric Industrial Co., Ltd., Central Research Laboratories, Electro-Mechanics Group
  • SAITOH Toshi
    Matsushita Electric Industrial Co., Ltd., Central Research Laboratories, Electro-Mechanics Group

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Other Title
  • 色重ね現像によるカラー電子写真プロセス
  • 色重ね現像によるカラー電子写真プロセス--1ドラム色重ねプロセス
  • イロカサネ ゲンゾウ ニ ヨル カラー デンシ シャシン プロセス 1 ドラ
  • &mdsh; “1ドラム色重ねプロセス” —

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Abstract

Full-color image is directly formed on the photoconductor by repetitional cycles of charging, exposing and developing of yellow, magenta and cyan toners. Each image is superimposed onto the preceding toner image on the photoconductor.<BR> Main technical points are as follows: <BR> 1) To make the naked area and the toner-covered area of the photoconductor equal surface potentia1, a scorotron charger is employed. <BR> 2) To make succeeding latent image under the preceding toner image, the choice of the light source and the developing order of three component colors are important. As for the light emitting diode, the developing order of Y —> M —> C makes the excellent color reproduction. <BR> 3) To avoid color contamination, non-contact toner flying development is used under D.C. electric field. <BR> By this process, 8 prints A4 per minute can be obtained. In this color process, conventionally employed image-transfer-drum is excluded. So this novel color process has the good capability to make color electrophotographic printer smaller.

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