Color image forming apparatus and method for controlling the...

Details Color image forming apparatus and method for controlling the... Color image forming apparatus and method for controlling the...

2005-05-24

2005-05-24

Chen, Sophia S. (Department: 2852)

Electrophotography

Diagnostics

By inspection of copied image

C399S049000

Reexamination Certificate

active

06898381

ABSTRACT:
A color image forming apparatus includes a first density detecting unit for detecting a density of a first detection toner image formed on an image bearing member or a transferring material carrying member, and a second density detecting unit for detecting a density of a second detection toner image fixed onto a transferring material, and executes image density control based on a detection result of the first density detecting unit and a detection result of the second density detecting unit. A detecting light application position of the first density detecting unit and a detection light application position of the second density detecting unit are almost equal relative to a perpendicular direction to a transferring material conveying direction. It is thereby possible to shorten time required for density control and to prevent deterioration of density control accuracy caused by a temporal change and a positional change in the density of a detection toner patch.

REFERENCES:
patent: 6029021 (2000-02-01), Nishimura et al.

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