Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-08-14

2008-10-14

Tran, Hoan H (Department: 2852)

Electrophotography

Image formation

Photoconductive member

C399S301000

Reexamination Certificate

active

07437100

ABSTRACT:
The color offset is reduced with a simple system by relative removal of speed variation components between drums of a tandem color image forming apparatus. Assuming that the speed variation of a magenta photosensitive drum is the largest, the speed variation components of various colors are subtracted from the speed variation component relating to magenta, and the results are added to the respective speed target values. The rotational speed differences of the photosensitive drums of various colors are eliminated by applying the same speed variation component as in the case of magenta to the rotational speed of the photosensitive drums of various colors other than magenta. Phase correction is performed with respect to the phase differences produced by the fact that the distance between drums of various colors is different from the drum peripheral length. Since the phase difference of the photosensitive drums is then zero at the transfer positions of various colors, the effect of speed variation is prevented from appearing in the image as color offset.

REFERENCES:
patent: 6771919 (2004-08-01), Koide
patent: 7099614 (2006-08-01), Koizumi
patent: 7239833 (2007-07-01), Tomita et al.
patent: 7343119 (2008-03-01), Matsuda et al.
patent: 7376375 (2008-05-01), Kobayashi et al.
patent: 10-078734 (1998-03-01), None
patent: 10-119355 (1998-05-01), None
patent: 2002-072816 (2002-03-01), None

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