Charger, image forming apparatus, and charge control method

Details Charger, image forming apparatus, and charge control method Charger, image forming apparatus, and charge control method

2007-12-12

2009-12-29

Lee, Susan S (Department: 2852)

Electrophotography

Control of electrophotography process

Control of charging

C399S174000, C399S175000, C399S176000

Reexamination Certificate

active

07639960

ABSTRACT:
A charger includes: a charging brush which is rotatably provided and is brought into contact with an image carrier to charge the surface of the image carrier; a charging roller which is brought into contact with the image carrier at a portion on the downstream side relative to the charging brush in the rotational direction of the image carrier to charge the surface of the image carrier; and a controller which controls voltages applied to the charging brush and charging roller, wherein the controller controls voltages applied to the charging brush and charging roller such that one-fifth of the absolute value of a charging brush current flowing between the image carrier and charging brush is lower than the absolute value of a charging roller current flowing between the image carrier and charging roller.

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