Photosensitive drum unit and image forming apparatus capable...

Details Photosensitive drum unit and image forming apparatus capable... Photosensitive drum unit and image forming apparatus capable...

2008-01-10

2011-10-18

Porta, David (Department: 2884)

Electrophotography

Image formation

Transfer

C399S107000, C399S110000, C399S112000, C399S299000

Reexamination Certificate

active

08041273

ABSTRACT:
A photosensitive drum unit includes a frame and a plurality of photosensitive drums. The plurality of photosensitive drums is supported by the frame and has a shape identical with one another. Each of the plurality of photosensitive drums is rotatable about a rotational axis. The plurality of photosensitive drums is arranged such that a distance between rotational axes of adjacent photosensitive drums is a constant distance P. Each of the plurality of photosensitive drums has a circumferential reference position that is common to all of the plurality of photosensitive drums. Each of the plurality of photosensitive drums has a plurality of marks at circumferential positions that are defined relative to the circumferential reference position. Adjacent two positions of the circumferential positions are spaced by a central angle of {(S−P)/S}×360° where S is a circumferential length of each of the plurality of photosensitive drums.

REFERENCES:
patent: 4796050 (1989-01-01), Furuta et al.
patent: 6360070 (2002-03-01), Taka et al.
patent: 6930786 (2005-08-01), Kataoka et al.
patent: 2005/0009351 (2005-01-01), Takahashi et al.
patent: 2005/0286937 (2005-12-01), Kim et al.
patent: 2001-188395 (2001-07-01), None
patent: 2005-010466 (2005-01-01), None

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