Color image forming apparatus and image quality control system

Details Color image forming apparatus and image quality control system Color image forming apparatus and image quality control system

2005-04-05

2005-04-05

Tran, Hoan (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S298000, C399S299000

Reexamination Certificate

active

06876821

ABSTRACT:
A color image forming apparatus and a image quality control system capable of detecting uneven angular speed of a photoreceptor drum easily and reducing color drift significantly simply by adjusting rotational phase of each image carrier is provided. A color image forming apparatus includes a plurality of transfer units for transferring formed image on the recording material S to be placed and carried on the carrying unit, a pattern forming unit for forming a displacement detection pattern on the carrying unit, a displacement detecting unit for detecting a displacement detection pattern formed on the carrying unit, and a phase adjusting unit for adjusting the rotational phase of the photosensitive drum, and is characterized in that the displacement detecting unit includes a computing unit for arranging the detection pattern of reference color and detecting colors that are detected by one of the detecting units and by other detecting unit respectively, and calculating the amount of displacement of the detecting color with respect to the reference color based on the result detected from the displacement detection pattern.

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patent: 10-333398 (1998-12-01), None

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