US 5,181,072 AGranted

Color recording apparatus

AssigneeFuji Xerox Co., Ltd.

InventorsNobumasa Furuya, Tsuneo Noami, Takeshi Sumikawa

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Abstract

In a color recording apparatus, charges are applied to a latent electrostatic image carrier by a scorotron having a grid after development of a first latent electrostatic image on the carrier with a first color toner. Thereafter, a second electrostatic latent image is formed and developed with a second color toner. If the charges given by the scorotron have the same polarity as a charging polarity of the first color toner, a potential of the grid is set to be equal to a non-image portion potential of the first latent electrostatic image, or set to have a polarity opposite to that of an image portion potential of the first latent electrostatic image assuming that the non-image portion potential is regarded as 0 V as a reference potential. If the charges given by the scorotron have a polarity opposite to the charging polarity of the first color toner, a potential of the grid is set to have a polarity opposite to that of the non-image portion potential image assuming that the image portion potential is regarded as 0 V as a reference potential.

Claims9

Dependent claims

A color recording apparatus comprising:

first development means for developing a first latent electrostatic image with a first color toner, said first latent electrostatic image being formed on a latent electrostatic image carrier;
scorotron means, including a grid, for applying a charge to said latent electrostatic image carrier after the development of said first latent electrostatic image by said first development means, said scorotron means including:
means, responsive in the event that said charge applied by said scorotron means has the same polarity as a charging polarity of said first color toner, for setting a potential of said grid to a level equivalent to a potential of a non-image portion of said first latent electrostatic image or to a polarity opposite to a polarity of an image portion of said first latent electrostatic image with said potential of said non-image portion being regarded as the neutral polarity reference potential, and
means, responsive in the event that said charge applied by said scorotron means has a polarity opposite to said charging polarity of said first color toner, for setting said potential of said grid to a polarity opposite to a polarity of said non-image portion with said potential of said image portion being regarded as the neutral polarity reference potential;
and
second development means for developing a second latent electrostatic image with a second color toner, said second latent electrostatic image being formed on said latent electrostatic image carrier.

3 more elements

Dependencies are inferred from the claim text.