Image forming apparatus

Details Image forming apparatus Image forming apparatus

2007-04-24

2007-04-24

Nguyen, Vincent Q. (Department: 2858)

Electrophotography

Control of electrophotography process

Of plural processes

Reexamination Certificate

active

11018858

ABSTRACT:
In an image forming apparatus a forming unit forms an image using a light color toner and a dark color toner having the same hue as the light color toner. A patch image is formed with the light color toner and the dark color toner, and has different image density level portions. In the patch image, a difference in image density levels between adjacent image density level portions in a transition range before and after a switching region between a range in which either one of the light color toner or the dark color toner is used and a range in which both of the light color toner and the dark color toner are used is smaller than a difference in image density levels in the other ranges. Densities of the patch image are detected and the image density is controlled in accordance with a detected output.

REFERENCES:
patent: 6013403 (2000-01-01), Ichikawa
patent: 6631249 (2003-10-01), Katsumi et al.
patent: 6640077 (2003-10-01), Suzuki et al.
patent: 2000-231279 (2000-08-01), None

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