Color image forming apparatus

Details Color image forming apparatus Color image forming apparatus

2005-03-01

2005-03-01

Goodrow, John L (Department: 1756)

Electrophotography

Image formation

Development

C399S299000, C430S046400

Reexamination Certificate

active

06862418

ABSTRACT:
An electrophotographic color image forming apparatus including a multiple number of photoreceptors for multiple development colors including black, is constructed such that the photoreceptors satisfy the following relation:in-line-formulae description="In-line Formulae" end="lead"?0.5<(X/Y)<0.8,in-line-formulae description="In-line Formulae" end="tail"?where X represents the reduction in film thickness (Å) per 1×107mm of the traveling distance of the photoreceptor for black development and Y represents the reduction in film thickness (Å) per 1×107mm of the traveling distance of the photoreceptors for the other development colors. This limitation is aimed at differentiating the abrasion resistance of the photoreceptors between that for black and that for colors and designating the reduced amounts of the film thickness per unit traveling distance to fall within the predetermined ranges, whereby it is possible to prevent the drum for black development, which is used most frequently, alone, from being worn away at an earlier time. Accordingly, both the drums for black and for colors can be replaced at approximately the same time, to the maintenance cost can be reduced.

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