Image forming apparatus and adjustment method of the same

Details Image forming apparatus and adjustment method of the same Image forming apparatus and adjustment method of the same

2005-02-08

2005-02-08

Brase, Sandra (Department: 2852)

Electrophotography

Control of electrophotography process

Color balance

C358S448000, C358S461000, C399S049000

Reexamination Certificate

active

06853815

ABSTRACT:
In a color image forming apparatus, a color toner patch for controlling density or chromaticity may be detected by a color sensor and fed back to process conditions so as to control density or chromaticity of a final output image.However, a white reference board for proofreading sensor output is expensive, and may have paper powder, toner or ink scattered thereon to become no longer usable as a reference board.The present invention provides a color identification method and a color image forming apparatus exploitable for density or chromaticity control by using a color sensor without using the reference board.In the present invention, a gray patch of black and a process gray patch of yellow, magenta and cyan are formed on a transfer medium, the chromaticity is detected without using a criterion for sensor output proofreading, and relative comparison is made between the chromaticities detected from the above two types of gray patches by using as a standard the gray patch of black which is almost achromatic, and if the chromaticities are consistent with each other, the process gray patch is judged to be achromatic.

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