Image forming apparatus and charging unit therefor

Details Image forming apparatus and charging unit therefor Image forming apparatus and charging unit therefor

2007-10-30

2007-10-30

Benson, Walter (Department: 2858)

Electrophotography

Image formation

Charging

C399S175000, C399S168000

Reexamination Certificate

active

11001020

ABSTRACT:
An image forming apparatus includes an image bearing member, and first and second chargers. Each of the chargers includes a magnetic member for generating magnetism, has a holding member for holding magnetic particles by a magnetic force, and charges the image bearing member by bringing the magnetic particles in contact therewith. The magnetic member of each of the chargers has a magnetic pole facing the image bearing member. The second charger is located at the tail end in the image bearing member rotational direction, but before a position at which an image is formed on the image bearing member. In the image bearing member rotation direction, and relative to a position at which the image bearing member comes closest to the holding member, the first charger's magnetic member has a peak magnetic force positioned downstream, and the second charger's magnetic member has a peak magnetic force positioned upstream.

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Chinese Office Action and English translation in counterpart application No. 200410096910.0, dated Apr. 27, 2007.

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