Image forming apparatus with a pre-exposure light control...

Details Image forming apparatus with a pre-exposure light control... Image forming apparatus with a pre-exposure light control...

2008-07-14

2010-11-30

Brase, Sandra L (Department: 2884)

Electrophotography

Supplemental electrophotographic process

Exposure or charging

Reexamination Certificate

active

07844200

ABSTRACT:
An inexpensive image forming apparatus, which can suppress a ghost to obtain an image maintaining satisfactory density and gradations for a long time. The apparatus including an electrophotographic photosensitive member, a contact charger in contact with the photosensitive member for charging the photosensitive member, a charging voltage applying device for applying direct current voltage to the contact charger, a charging current detector for detecting electric current flowing through the contact charger, a pre-exposure device for exposing the photosensitive member to light to remove residual charge on the photosensitive member, and a pre-exposure light amount controller for controlling an exposure light amount of the pre-exposure device in image formation based on the results of detection by the charging current detector when the exposure light amount of the pre-exposure device is changed with direct current voltage applied from the charging voltage applying device to the contact charger during non-image formation.

REFERENCES:
patent: 4474455 (1984-10-01), Hirakura et al.
patent: 4933721 (1990-06-01), Yasuda et al.
patent: 6070032 (2000-05-01), Rokutanda et al.
patent: 6208820 (2001-03-01), Nami
patent: 11-174755 (1999-07-01), None

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