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US 5,329,346 AGranted
Multi-color image forming system
AssigneeCanon Kabushiki Kaisha
InventorsHiroyuki Suzuki, Kenichiro Waki
Life of this patent
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Abstract
The present invention aims to solve problems caused in forming multiple images on the same transfer sheet in response to an original by using black toner and color toner, and prevents a shade of the original from being developed by the color toner which results in the indistinct copy image. To this end, according to the present invention, an area developed by the color toner is made narrower than an area developed by the black toner.
Claims11
A color image forming apparatus, comprising:
- an image carrier;
- reading means for reading and for inputting color information for each color of a color original;
- first latent image forming means for forming a latent image on the image carrier in accordance with color information corresponding to a black color input by said reading means;
- first developing means for developing the latent image formed by said first latent image forming means using a black color developer;
- second latent image forming means for forming a latent image on the image carrier of a color different from a black color in accordance with color information input by said reading means;
- and
- second developing means for developing the latent image formed by said second latent image forming means using a color developer different from a black color,
- wherein a second image area formed on the image carrier by said second latent image forming means and said second developing means is smaller than a first image area formed on the image carrier by said first latent image forming means and said first developing means.
5 more elements
Dependencies are inferred from the claim text.