Electrophotography – Control of electrophotography process – Having temperature or humidity detection
Reexamination Certificate
2008-09-29
2011-10-11
Chen, Sophia S (Department: 2852)
Electrophotography
Control of electrophotography process
Having temperature or humidity detection
C399S066000
Reexamination Certificate
active
08036547
ABSTRACT:
The present application is directed to methods of controlling the transfer voltage in a transfer nip formed between the photoconductive member and the transfer member. The methods offset the effects of large transfer current spikes caused when a media sheet enters and exits the transfer nip and account for temperature and humidity operating parameters using wet-bulb temperature measurements to adjust the transfer voltage. The control may include either ramping up or ramping down the transfer voltage. The ramped transfer voltage may include a series of alternating positive and negative steps that generally trend to ramp up or down. The size of the steps may further be adjusted to provide a smooth transition.
REFERENCES:
patent: 6381425 (2002-04-01), Sasai
patent: 6498907 (2002-12-01), Yoda
patent: 2008/0131156 (2008-06-01), Brockman
patent: 2000-330400 (2000-11-01), None
patent: 2003-280302 (2003-10-01), None
patent: 2008-185705 (2008-08-01), None
Booth Robert Reed
Brockman Ryan David
Embry Kerry Leland
Etter Paul Wesley
Marin Claudia Alexandra
Chen Sophia S
Lexmark International Inc.
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