Electrophotography – Control of electrophotography process – Having temperature or humidity detection
Reexamination Certificate
2008-09-29
2010-10-19
Brase, Sandra L (Department: 2884)
Electrophotography
Control of electrophotography process
Having temperature or humidity detection
C399S301000, C347S116000
Reexamination Certificate
active
07817929
ABSTRACT:
A system for adjusting selected operating parameters of an image forming device to improve color registration based on selected environmental conditions includes a first image forming station to print a first registration mark on a substrate, a second image forming station to at least partially erase the first registration mark to form a registration pattern in a reverse transfer process of the color registration, and a control mechanism to adjust voltage biases of charge and developer rolls of the second image forming station based on wet-bulb temperature values determined from measured dry-bulb temperature and relative humidity values and stored in a lookup table so as to maintain a predetermined potential difference between charged and uncharged areas of a PC drum of the second image forming station that avoids Paschen breakdown and the development of toner at charged areas of the PC drum during the reverse transfer process of the color registration.
REFERENCES:
patent: 5552862 (1996-09-01), Masuda et al.
patent: 6968148 (2005-11-01), Taka et al.
patent: 7239833 (2007-07-01), Tomita et al.
patent: 7257358 (2007-08-01), Overall et al.
Booth Robert Reed
Brockman Ryan David
Embry Kerry Leland
Etter Paul Wesley
Marin Claudia Alexandra
Brase Sandra L
Lexmark International Inc.
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