Electrophotography – Control of electrophotography process – Having temperature or humidity detection
Reexamination Certificate
2011-05-10
2011-05-10
Lee, Susan S (Department: 2884)
Electrophotography
Control of electrophotography process
Having temperature or humidity detection
C399S050000, C399S055000
Reexamination Certificate
active
07941062
ABSTRACT:
An image forming apparatus includes a rotatable photosensitive drum, a charging apparatus to which a charging voltage is applied, an exposure apparatus forming an electrostatic image, a developing apparatus to which a development voltage is applied, a timer measuring an image formation time lapsed from start of rotation of the photosensitive drum and an image formation stop time lapsed from stop of the rotation of the photosensitive drum, and a temperature and humidity sensor detecting a temperature and a humidity of an atmosphere environment around the photosensitive drum. When the humidity is low, a charging voltage is controlled based on a measured result of the timer and detected results of the temperature and humidity sensor. When the humidity is high, the charging voltage is controlled based on the measured result of the timer and the temperature detected result of the temperature and humidity sensor without using humidity information.
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Canon Kabushiki Kaisha
Canon USA Inc. IP Division
Lee Susan S
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